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Undy 14 Day Long Range Forecast

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

Monmouthshire, United Kingdom

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

Reviewing the forecast for Undy Over the next 14 days and the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 18°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Monday 20th at 9°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. It looks like Friday 17th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May		12:00

SSE
SSE

 18 / 26 mph 57 / 53°F 83% 997 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 17 / 23 mph 59 / 55°F 83% 997 mb
Low level cloud: 43%
Mid level cloud: 15%
High level cloud: 74%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 12 / 19 mph 58 / 55°F 85% 998 mb
Low level cloud: 15%
Mid level cloud: 18%
High level cloud: 18%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 9 / 13 mph 55 / 53°F 91% 1000 mb
Low level cloud: 34%
Mid level cloud: 30%
High level cloud: 63%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
May		00:00

E
E

 7 / 12 mph 52 / 50°F 93% 1000 mb
Low level cloud: 49%
Mid level cloud: 24%
High level cloud: 84%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 8 / 11 mph 52 / 49°F 94% 1001 mb
Low level cloud: 51%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 9 / 11 mph 53 / 49°F 93% 1002 mb
Low level cloud: 85%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 12 / 18 mph 57 / 53°F 78% 1003 mb
Low level cloud: 41%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 11 / 19 mph 58 / 54°F 76% 1004 mb
Low level cloud: 81%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 10 / 17 mph 59 / 56°F 71% 1004 mb
Low level cloud: 62%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 9 / 14 mph 59 / 56°F 80% 1004 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 7 / 14 mph 53 / 51°F 88% 1006 mb
Low level cloud: 13%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

NE
NE

 7 / 14 mph 49 / 47°F 89% 1006 mb
Low level cloud: 62%
Mid level cloud: 28%
High level cloud: 19%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 9 / 16 mph 49 / 45°F 90% 1006 mb
Low level cloud: 25%
Mid level cloud: 18%
High level cloud: 72%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 9 / 13 mph 52 / 47°F 90% 1007 mb
Low level cloud: 21%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 8 / 9 mph 59 / 57°F 85% 1007 mb
Low level cloud: 65%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 9 / 11 mph 61 / 61°F 82% 1007 mb
Low level cloud: 82%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 6 / 9 mph 61 / 60°F 84% 1006 mb
Low level cloud: 18%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

 9 / 13 mph 58 / 56°F 91% 1007 mb
Low level cloud: 9%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

 6 / 9 mph 54 / 52°F 95% 1006 mb
Low level cloud: 92%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 17
May		00:00

WNW
WNW

 5 / 7 mph 54 / 53°F 96% 1006 mb
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NNE
NNE

 6 / 9 mph 54 / 52°F 97% 1005 mb
Low level cloud: 98%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 3 / 5 mph 53 / 53°F 98% 1006 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 70%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

ENE
ENE

 3 / 4 mph 55 / 55°F 98% 1007 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

S
S

 4 / 5 mph 57 / 57°F 94% 1009 mb
Low level cloud: 75%
Mid level cloud: 51%
High level cloud: 7%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 3 / 4 mph 60 / 59°F 84% 1010 mb
Low level cloud: 38%
Mid level cloud: 23%
High level cloud: 11%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 3 / 5 mph 60 / 59°F 81% 1011 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 12 mph 58 / 55°F 89% 1012 mb
Low level cloud: 40%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNE
NNE

 8 / 12 mph 55 / 53°F 94% 1013 mb
Low level cloud: 36%
Mid level cloud: 12%
High level cloud: 92%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 13 mph 54 / 51°F 96% 1013 mb
Low level cloud: 81%
Mid level cloud: 32%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 10 / 14 mph 53 / 49°F 95% 1014 mb
Low level cloud: 87%
Mid level cloud: 46%
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

NE
NE

 10 / 11 mph 55 / 53°F 90% 1015 mb
Low level cloud: 80%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 8 / 9 mph 60 / 57°F 84% 1015 mb
Low level cloud: 69%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 9 / 12 mph 62 / 60°F 80% 1014 mb
Low level cloud: 58%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 9 / 13 mph 61 / 59°F 85% 1014 mb
Low level cloud: 60%
Mid level cloud: 25%
High level cloud: 73%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 8 / 13 mph 58 / 55°F 92% 1015 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 9 / 17 mph 52 / 49°F 95% 1015 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 30%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 17 mph 52 / 48°F 94% 1014 mb
Low level cloud: 26%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 11 / 17 mph 52 / 47°F 93% 1015 mb
Low level cloud: 20%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 13 / 15 mph 59 / 56°F 81% 1015 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 10 / 11 mph 64 / 63°F 71% 1014 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 12 / 15 mph 65 / 64°F 70% 1013 mb
Low level cloud: 12%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 12 / 17 mph 62 / 61°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 9 / 18 mph 54 / 50°F 90% 1014 mb
Low level cloud: 2%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 10 / 20 mph 50 / 46°F 92% 1014 mb
Low level cloud: 8%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 11 / 21 mph 48 / 43°F 93% 1014 mb
Low level cloud: 30%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 12 / 19 mph 51 / 46°F 91% 1014 mb
Low level cloud: 36%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 13 / 18 mph 54 / 49°F 90% 1014 mb
Low level cloud: 58%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 12 / 14 mph 61 / 60°F 84% 1014 mb
Low level cloud: 51%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 13 / 16 mph 63 / 62°F 80% 1013 mb
Low level cloud: 7%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 10 / 12 mph 62 / 61°F 86% 1012 mb
Low level cloud: 2%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: medium
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 7 / 15 mph 53 / 50°F 89% 1013 mb
Low level cloud: 13%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May		00:00

SSE
SSE

 8 / 17 mph 52 / 49°F 96% 1013 mb
Low level cloud: 97%
Mid level cloud: 86%
High level cloud: 30%
Most Significant Cloud Type: low
100%
0.2 In
06:00

NE
NE

 8 / 17 mph 50 / 47°F 81% 1024 mb
Low level cloud: 4%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
12:00

SE
SE

 8 / 16 mph 57 / 55°F 92% 1011 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.3 In
Wed 22
May		00:00

WSW
WSW

 8 / 18 mph 52 / 49°F 93% 1010 mb
Low level cloud: 51%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: low
63%
0.0 In
06:00

ENE
ENE

 8 / 17 mph 52 / 49°F 91% 1012 mb
Low level cloud: 98%
Mid level cloud: 77%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
12:00

N
N

 5 / 11 mph 58 / 58°F 91% 1012 mb
Low level cloud: 99%
Mid level cloud: 49%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 3 / 7 mph 60 / 60°F 88% 1013 mb
Low level cloud: 88%
Mid level cloud: 75%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
May		00:00

NNW
NNW

 1 / 2 mph 57 / 57°F 95% 1010 mb
Low level cloud: 96%
Mid level cloud: 48%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NE
NE

 9 / 18 mph 49 / 45°F 89% 1016 mb
Low level cloud: 59%
Mid level cloud: 43%
High level cloud: 3%
Most Significant Cloud Type: low
74%
0.1 In
12:00

SW
SW

 7 / 14 mph 58 / 56°F 90% 1012 mb
Low level cloud: 84%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 1 / 2 mph 56 / 56°F 82% 1017 mb
Low level cloud: 75%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
Fri 24
May		00:00

WSW
WSW

 6 / 12 mph 57 / 56°F 94% 1014 mb
Low level cloud: 48%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: low
53%
0.0 In
06:00

NE
NE

 6 / 12 mph 52 / 50°F 83% 1019 mb
Low level cloud: 42%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
12:00

SW
SW

 7 / 16 mph 59 / 58°F 82% 1017 mb
Low level cloud: 79%
Mid level cloud: 26%
High level cloud: 2%
Most Significant Cloud Type: low
87%
0.0 In
18:00

ENE
ENE

 11 / 22 mph 54 / 51°F 82% 1022 mb
Low level cloud: 24%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
38%
0.0 In
Sat 25
May		00:00

W
W

 6 / 12 mph 56 / 55°F 91% 1020 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: low
45%
0.0 In
06:00

ENE
ENE

 10 / 21 mph 49 / 45°F 85% 1023 mb
Low level cloud: 89%
Mid level cloud: 70%
High level cloud: 81%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 6 / 12 mph 64 / 64°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
18:00

SE
SE

 10 / 20 mph 54 / 51°F 91% 1021 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Sun 26
May		00:00

SSW
SSW

 1 / 3 mph 62 / 62°F 89% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

E
E

 5 / 11 mph 51 / 49°F 97% 1017 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.1 In
12:00

S
S

 2 / 5 mph 64 / 64°F 79% 1024 mb
Low level cloud: 22%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
44%
0.0 In
18:00

WSW
WSW

 5 / 10 mph 58 / 58°F 96% 1014 mb
Low level cloud: 89%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Mon 27
May		00:00

SSW
SSW

 3 / 7 mph 63 / 63°F 89% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
0.0 In
06:00

SW
SW

 2 / 5 mph 55 / 56°F 92% 1013 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
89%
0.1 In
12:00

SSE
SSE

 1 / 2 mph 65 / 65°F 71% 1022 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 99%
Most Significant Cloud Type: medium
13%
0.0 In
18:00

S
S

 11 / 23 mph 58 / 55°F 94% 1009 mb
Low level cloud: 73%
Mid level cloud: 71%
High level cloud: 49%
Most Significant Cloud Type: low
100%
0.5 In
Tue 28
May		00:00

NW
NW

 4 / 8 mph 60 / 60°F 92% 1022 mb
Low level cloud: 5%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

SE
SE

 3 / 7 mph 57 / 58°F 93% 1007 mb
Low level cloud: 28%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
33%
0.0 In
12:00

NE
NE

 11 / 24 mph 59 / 59°F 92% 1021 mb
Low level cloud: 92%
Mid level cloud: 29%
High level cloud: 69%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 9 / 18 mph 65 / 65°F 94% 1003 mb
Low level cloud: 66%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
81%
0.0 In
Wed 29
May		00:00

NE
NE

 14 / 29 mph 55 / 51°F 91% 1021 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 81%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WNW
WNW

 3 / 6 mph 58 / 58°F 93% 1001 mb
Low level cloud: 77%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

 13 / 28 mph 58 / 55°F 84% 1019 mb
Low level cloud: 95%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 13 / 26 mph 59 / 59°F 85% 1000 mb
Low level cloud: 29%
Mid level cloud: 16%
High level cloud: 4%
Most Significant Cloud Type: low
35%
0.6 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