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Greysteel 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Greysteel

County Londonderry, United Kingdom

Long range weather outlook for Greysteel includes 14 day forecast summary:

Over the next 14 days the Greysteel forecast suggests the average daytime maximum temperature will be around 9°C, with a high for the two weeks of 11°C expected on the afternoon of Tuesday 10th. The average minimum temperature will be 2°C, dipping to its lowest on the morning of Wednesday 18th at -1°C. The next 14 days will have some days seeing a little precipitation and some days with rain, sleet or snow. The current forecast indicates Thursday 12th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the morning of Thursday 12th, coming from a south westerly direction, and reaching around 26mph. However, the maximum wind gusts are forecast for Wednesday evening.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 09
Mar		15:00

SW
SW

 8 / 9 mph 50 / 46°F 71% 1012 mb
Low level cloud: 82%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 6 / 11 mph 43 / 39°F 82% 1011 mb
Low level cloud: 24%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 10 / 15 mph 42 / 36°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 64%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 10
Mar		00:00

SSW
SSW

 12 / 18 mph 40 / 33°F 83% 1010 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 12 / 16 mph 42 / 35°F 86% 1008 mb
Low level cloud: 92%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 12 / 16 mph 43 / 36°F 88% 1006 mb
Low level cloud: 89%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 10 / 12 mph 45 / 40°F 92% 1006 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 13 / 14 mph 49 / 44°F 88% 1003 mb
Low level cloud: 95%
Mid level cloud: 23%
High level cloud: 77%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 15 / 17 mph 52 / 47°F 82% 998 mb
Low level cloud: 63%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 17 / 24 mph 49 / 43°F 92% 992 mb
Low level cloud: 99%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

 19 / 30 mph 47 / 39°F 85% 991 mb
Low level cloud: 43%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 11
Mar		00:00

WSW
WSW

 23 / 33 mph 44 / 35°F 85% 992 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 24 / 34 mph 42 / 33°F 86% 995 mb
Low level cloud: 99%
Mid level cloud: 55%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 20 / 30 mph 41 / 32°F 84% 1000 mb
Low level cloud: 60%
Mid level cloud: 17%
High level cloud: 3%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 16 / 19 mph 44 / 37°F 76% 1004 mb
Low level cloud: 52%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 17 / 20 mph 48 / 41°F 69% 1006 mb
Low level cloud: 11%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 18 / 21 mph 49 / 43°F 68% 1005 mb
Low level cloud: 17%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 19 / 22 mph 48 / 41°F 74% 1003 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 22 / 34 mph 45 / 37°F 76% 1000 mb
Low level cloud: 92%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 12
Mar		00:00

SSW
SSW

 26 / 34 mph 48 / 40°F 80% 996 mb
Low level cloud: 87%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 25 / 34 mph 48 / 40°F 87% 993 mb
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SW
SW

 22 / 30 mph 46 / 38°F 89% 991 mb
Low level cloud: 97%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

SW
SW

 20 / 27 mph 41 / 32°F 87% 993 mb
Low level cloud: 75%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

SW
SW

 18 / 21 mph 44 / 36°F 85% 992 mb
Low level cloud: 66%
Mid level cloud: 49%
High level cloud: 93%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 15 / 20 mph 42 / 33°F 86% 990 mb
Low level cloud: 47%
Mid level cloud: 45%
High level cloud: 96%
Most Significant Cloud Type: low
74%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

 12 / 19 mph 40 / 32°F 78% 989 mb
Low level cloud: 42%
Mid level cloud: 22%
High level cloud: 58%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 11 / 13 mph 38 / 31°F 95% 987 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 13
Mar		00:00

WSW
WSW

 13 / 19 mph 34 / 25°F 94% 986 mb
Low level cloud: 44%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SW
SW

 14 / 23 mph 32 / 22°F 85% 986 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 14 / 25 mph 33 / 23°F 83% 987 mb
Low level cloud: 2%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 11 / 13 mph 35 / 27°F 90% 987 mb
Low level cloud: 39%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 11 / 13 mph 40 / 34°F 94% 988 mb
Low level cloud: 89%
Mid level cloud: 94%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WSW
WSW

 14 / 18 mph 43 / 36°F 87% 988 mb
Low level cloud: 61%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 10 / 13 mph 39 / 32°F 96% 989 mb
Low level cloud: 81%
Mid level cloud: 44%
High level cloud: 57%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 9 / 17 mph 35 / 29°F 90% 991 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 14
Mar		00:00

WNW
WNW

 12 / 23 mph 37 / 29°F 85% 994 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 14 / 24 mph 38 / 30°F 87% 997 mb
Low level cloud: 29%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 12 / 22 mph 38 / 30°F 87% 999 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 11 / 16 mph 42 / 35°F 84% 1002 mb
Low level cloud: 25%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 13 / 17 mph 46 / 40°F 81% 1003 mb
Low level cloud: 4%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 13 / 17 mph 46 / 39°F 78% 1005 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 9 / 17 mph 39 / 33°F 84% 1007 mb
Low level cloud: 6%
Mid level cloud: 19%
High level cloud: 53%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 6 / 13 mph 33 / 27°F 92% 1008 mb
Low level cloud: 5%
Mid level cloud: 48%
High level cloud: 73%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 15
Mar		00:00

SW
SW

 6 / 13 mph 34 / 29°F 93% 1008 mb
Low level cloud: 26%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 7 / 14 mph 34 / 29°F 94% 1008 mb
Low level cloud: 33%
Mid level cloud: 100%
High level cloud: 36%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 11 / 17 mph 40 / 33°F 92% 1005 mb
Low level cloud: 81%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 15 / 23 mph 45 / 38°F 90% 1005 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 18 / 23 mph 45 / 37°F 87% 1005 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 20 / 27 mph 44 / 35°F 82% 1006 mb
Low level cloud: 47%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 19 / 27 mph 39 / 29°F 92% 1008 mb
Low level cloud: 85%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 17 / 29 mph 38 / 29°F 82% 1010 mb
Low level cloud: 65%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 16
Mar		00:00

WSW
WSW

 9 / 18 mph 33 / 25°F 91% 1004 mb
Low level cloud: 4%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
55%
0.0 In
06:00

WSW
WSW

 9 / 20 mph 33 / 25°F 90% 1006 mb
Low level cloud: 4%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
0.0 In
12:00

S
S

 11 / 23 mph 47 / 42°F 85% 1005 mb
Low level cloud: 50%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: low
63%
0.0 In
18:00

WSW
WSW

 11 / 23 mph 45 / 39°F 77% 1002 mb
Low level cloud: 27%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
59%
0.0 In
Tue 17
Mar		00:00

SSW
SSW

 20 / 43 mph 51 / 44°F 90% 989 mb
Low level cloud: 99%
Mid level cloud: 56%
High level cloud: 45%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

 22 / 45 mph 39 / 29°F 78% 978 mb
Low level cloud: 91%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 17 / 36 mph 46 / 39°F 73% 981 mb
Low level cloud: 60%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
67%
0.0 In
18:00

WSW
WSW

 13 / 28 mph 42 / 34°F 81% 995 mb
Low level cloud: 27%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
Wed 18
Mar		00:00

WNW
WNW

 23 / 48 mph 42 / 33°F 88% 985 mb
Low level cloud: 78%
Mid level cloud: 75%
High level cloud: 18%
Most Significant Cloud Type: low
100%
0.2 In
06:00

SSW
SSW

 7 / 15 mph 34 / 28°F 94% 996 mb
Low level cloud: 80%
Mid level cloud: 100%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 13 / 28 mph 47 / 41°F 72% 987 mb
Low level cloud: 28%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: low
66%
0.1 In
18:00

S
S

 12 / 24 mph 41 / 34°F 82% 988 mb
Low level cloud: 45%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
Thu 19
Mar		00:00

WSW
WSW

 6 / 12 mph 35 / 30°F 95% 965 mb
Low level cloud: 55%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.3 In
06:00

NE
NE

 4 / 8 mph 35 / 31°F 98% 978 mb
Low level cloud: 94%
Mid level cloud: 84%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.3 In
12:00

NW
NW

 23 / 48 mph 47 / 39°F 88% 980 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSE
SSE

 2 / 4 mph 43 / 43°F 92% 998 mb
Low level cloud: 81%
Mid level cloud: 28%
High level cloud: 21%
Most Significant Cloud Type: low
92%
0.0 In
Fri 20
Mar		00:00

NW
NW

 10 / 20 mph 39 / 33°F 88% 991 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

S
S

 14 / 30 mph 40 / 32°F 93% 994 mb
Low level cloud: 85%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 13 / 28 mph 40 / 32°F 97% 984 mb
Low level cloud: 99%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 11 / 22 mph 38 / 31°F 91% 987 mb
Low level cloud: 30%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.2 In
Sat 21
Mar		00:00

WSW
WSW

 18 / 38 mph 35 / 24°F 78% 986 mb
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 0%
Most Significant Cloud Type: medium
66%
0.1 In
06:00

W
W

 19 / 40 mph 31 / 19°F 84% 989 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.2 In
12:00

W
W

 23 / 49 mph 41 / 31°F 77% 993 mb
Low level cloud: 35%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.2 In
18:00

W
W

 19 / 39 mph 36 / 25°F 82% 987 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 21%
Most Significant Cloud Type: medium
77%
0.3 In
Sun 22
Mar		00:00

WSW
WSW

 14 / 30 mph 32 / 22°F 86% 993 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.2 In
06:00

WNW
WNW

 19 / 40 mph 36 / 25°F 92% 988 mb
Low level cloud: 69%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SW
SW

 12 / 25 mph 39 / 32°F 97% 992 mb
Low level cloud: 91%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
18:00

W
W

 12 / 26 mph 40 / 33°F 84% 990 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.2 In
Mon 23
Mar		00:00

W
W

 15 / 31 mph 36 / 27°F 89% 1002 mb
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: low
62%
0.2 In
06:00

SSW
SSW

 8 / 16 mph 33 / 26°F 94% 995 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 95%
Most Significant Cloud Type: low
73%
0.0 In
12:00

ESE
ESE

 5 / 11 mph 40 / 36°F 98% 997 mb
Low level cloud: 95%
Mid level cloud: 87%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SW
SW

 8 / 17 mph 44 / 39°F 91% 990 mb
Low level cloud: 56%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
78%
0.1 In
Tue 24
Mar		00:00

NNW
NNW

 7 / 15 mph 35 / 29°F 90% 1003 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.1 In
06:00

S
S

 9 / 18 mph 36 / 29°F 93% 991 mb
Low level cloud: 75%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

 15 / 32 mph 47 / 40°F 81% 1008 mb
Low level cloud: 23%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
18:00

W
W

 17 / 36 mph 44 / 36°F 87% 1002 mb
Low level cloud: 41%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.1 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure