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Seven Sisters 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Seven Sisters

Neath Port Talbot, United Kingdom

Long range weather outlook for Seven Sisters includes 14 day forecast summary:

The outlook for Seven Sisters in the two weeks ahead shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 20°C expected on the afternoon of Monday 3rd. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Saturday 1st at 8°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Predictions are Tuesday 28th will have the most precipitation with an accumulation of around 20.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May		15:00

SSE
SSE

 14 / 16 mph 62 / 60°F 64% 1014 mb
Low level cloud: 30%
Mid level cloud: 7%
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

SSE
SSE

 13 / 17 mph 56 / 52°F 82% 1013 mb
Low level cloud: 30%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 8 / 10 mph 51 / 48°F 96% 1012 mb
Low level cloud: 73%
Mid level cloud: 99%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Sun 26
May		00:00

ESE
ESE

 14 / 17 mph 52 / 48°F 95% 1009 mb
Low level cloud: 71%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

SE
SE

 9 / 16 mph 51 / 47°F 95% 1008 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 10 / 20 mph 50 / 46°F 94% 1008 mb
Low level cloud: 54%
Mid level cloud: 19%
High level cloud: 17%
Most Significant Cloud Type: low
62%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

 15 / 24 mph 54 / 48°F 88% 1009 mb
Low level cloud: 51%
Mid level cloud: 20%
High level cloud: 21%
Most Significant Cloud Type: low
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WSW
WSW

 15 / 20 mph 57 / 53°F 85% 1010 mb
Low level cloud: 52%
Mid level cloud: 42%
High level cloud: 27%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 15 / 21 mph 59 / 55°F 83% 1011 mb
Low level cloud: 43%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
53%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WSW
WSW

 16 / 21 mph 57 / 52°F 88% 1011 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 15 / 19 mph 54 / 49°F 93% 1013 mb
Low level cloud: 77%
Mid level cloud: 31%
High level cloud: 11%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May		00:00

WSW
WSW

 12 / 18 mph 50 / 45°F 90% 1013 mb
Low level cloud: 42%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 9 / 16 mph 47 / 43°F 87% 1014 mb
Low level cloud: 30%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 7 / 10 mph 51 / 47°F 84% 1014 mb
Low level cloud: 32%
Mid level cloud: 28%
High level cloud: 70%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 17 mph 54 / 50°F 78% 1014 mb
Low level cloud: 30%
Mid level cloud: 28%
High level cloud: 16%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 14 / 17 mph 57 / 53°F 70% 1015 mb
Low level cloud: 33%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 14 / 16 mph 57 / 53°F 71% 1014 mb
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 12 / 14 mph 56 / 52°F 80% 1015 mb
Low level cloud: 25%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 7 / 13 mph 50 / 47°F 94% 1016 mb
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 35%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		00:00

SSW
SSW

 8 / 13 mph 52 / 49°F 98% 1015 mb
Low level cloud: 98%
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
03:00

SSW
SSW

 9 / 17 mph 51 / 47°F 99% 1013 mb
Low level cloud: 100%
Mid level cloud: 88%
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

 13 / 27 mph 49 / 44°F 99% 1012 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

SW
SW

 17 / 33 mph 52 / 47°F 98% 1012 mb
Low level cloud: 100%
Mid level cloud: 53%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSW
SSW

 18 / 28 mph 55 / 51°F 97% 1012 mb
Low level cloud: 99%
Mid level cloud: 48%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

SW
SW

 19 / 25 mph 57 / 53°F 98% 1011 mb
Low level cloud: 100%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

 18 / 30 mph 55 / 51°F 98% 1010 mb
Low level cloud: 100%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

 18 / 32 mph 53 / 48°F 91% 1010 mb
Low level cloud: 87%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May		00:00

WSW
WSW

 19 / 27 mph 54 / 49°F 89% 1009 mb
Low level cloud: 77%
Mid level cloud: 27%
High level cloud: 18%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 21 / 33 mph 52 / 46°F 93% 1009 mb
Low level cloud: 91%
Mid level cloud: 36%
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

W
W

 19 / 33 mph 52 / 46°F 92% 1009 mb
Low level cloud: 44%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 19 / 28 mph 55 / 49°F 87% 1010 mb
Low level cloud: 66%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 18 / 23 mph 57 / 53°F 82% 1010 mb
Low level cloud: 72%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 17 / 23 mph 59 / 55°F 87% 1011 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 17 / 23 mph 58 / 53°F 87% 1011 mb
Low level cloud: 18%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 12 / 17 mph 56 / 52°F 91% 1012 mb
Low level cloud: 35%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May		00:00

WNW
WNW

 10 / 15 mph 53 / 49°F 93% 1013 mb
Low level cloud: 92%
Mid level cloud: 46%
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

NW
NW

 10 / 15 mph 51 / 47°F 93% 1013 mb
Low level cloud: 43%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 13 / 19 mph 50 / 45°F 92% 1014 mb
Low level cloud: 58%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 16 / 19 mph 53 / 48°F 88% 1015 mb
Low level cloud: 91%
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
12:00

NW
NW

 12 / 14 mph 56 / 53°F 86% 1016 mb
Low level cloud: 80%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 16 / 18 mph 58 / 55°F 77% 1016 mb
Low level cloud: 81%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 20 / 25 mph 57 / 52°F 79% 1017 mb
Low level cloud: 8%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 17 / 20 mph 55 / 49°F 87% 1019 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May		00:00

NNW
NNW

 20 / 28 mph 51 / 44°F 82% 1019 mb
Low level cloud: 65%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 19 / 25 mph 50 / 44°F 80% 1019 mb
Low level cloud: 92%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 19 / 23 mph 51 / 45°F 85% 1020 mb
Low level cloud: 85%
Mid level cloud: 13%
High level cloud: 11%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 18 / 20 mph 54 / 48°F 80% 1021 mb
Low level cloud: 82%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 17 / 20 mph 56 / 52°F 79% 1021 mb
Low level cloud: 78%
Mid level cloud: 28%
High level cloud: 10%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 18 / 20 mph 59 / 55°F 75% 1021 mb
Low level cloud: 73%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 14 / 18 mph 58 / 54°F 82% 1022 mb
Low level cloud: 20%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 7 / 15 mph 51 / 47°F 91% 1023 mb
Low level cloud: 3%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 01
Jun		00:00

NW
NW

 9 / 19 mph 44 / 39°F 87% 1014 mb
Low level cloud: 13%
Mid level cloud: 14%
High level cloud: 33%
Most Significant Cloud Type: low
22%
0.0 In
06:00

NNW
NNW

 7 / 16 mph 52 / 49°F 90% 1018 mb
Low level cloud: 21%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
12:00

WNW
WNW

 9 / 17 mph 58 / 56°F 73% 1024 mb
Low level cloud: 84%
Mid level cloud: 25%
High level cloud: 3%
Most Significant Cloud Type: low
92%
0.0 In
18:00

NW
NW

 9 / 18 mph 60 / 60°F 73% 1024 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 46%
Most Significant Cloud Type: medium
13%
0.0 In
Sun 02
Jun		00:00

W
W

 3 / 6 mph 55 / 55°F 92% 1025 mb
Low level cloud: 90%
Mid level cloud: 35%
High level cloud: 88%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

 8 / 17 mph 53 / 50°F 92% 1026 mb
Low level cloud: 90%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

 11 / 22 mph 65 / 65°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

NNW
NNW

 9 / 19 mph 63 / 63°F 78% 1023 mb
Low level cloud: 32%
Mid level cloud: 11%
High level cloud: 24%
Most Significant Cloud Type: low
38%
0.0 In
Mon 03
Jun		00:00

N
N

 4 / 10 mph 59 / 58°F 91% 1025 mb
Low level cloud: 31%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
06:00

N
N

 6 / 12 mph 55 / 54°F 86% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NW
NW

 6 / 14 mph 65 / 65°F 80% 1022 mb
Low level cloud: 43%
Mid level cloud: 65%
High level cloud: 2%
Most Significant Cloud Type: low
66%
0.0 In
18:00

NNE
NNE

 5 / 11 mph 66 / 66°F 83% 1021 mb
Low level cloud: 60%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: low
65%
0.0 In
Tue 04
Jun		00:00

NNW
NNW

 5 / 11 mph 55 / 54°F 93% 1019 mb
Low level cloud: 65%
Mid level cloud: 59%
High level cloud: 4%
Most Significant Cloud Type: low
85%
0.0 In
06:00

NE
NE

 6 / 12 mph 59 / 58°F 90% 1021 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

NNW
NNW

 17 / 36 mph 58 / 55°F 82% 1015 mb
Low level cloud: 71%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
78%
0.0 In
18:00

NE
NE

 12 / 24 mph 61 / 61°F 77% 1023 mb
Low level cloud: 87%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
Wed 05
Jun		00:00

WNW
WNW

 3 / 7 mph 56 / 56°F 76% 1010 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
06:00

NE
NE

 7 / 15 mph 54 / 52°F 90% 1024 mb
Low level cloud: 35%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: low
37%
0.0 In
12:00

NW
NW

 9 / 20 mph 53 / 50°F 73% 1005 mb
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 15%
Most Significant Cloud Type: low
77%
0.1 In
18:00

NE
NE

 9 / 19 mph 64 / 64°F 79% 1022 mb
Low level cloud: 55%
Mid level cloud: 10%
High level cloud: 80%
Most Significant Cloud Type: low
67%
0.0 In
Thu 06
Jun		00:00

NNW
NNW

 3 / 6 mph 50 / 49°F 87% 1005 mb
Low level cloud: 85%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NE
NE

 7 / 14 mph 55 / 53°F 83% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

SE
SE

 9 / 19 mph 57 / 55°F 75% 1005 mb
Low level cloud: 20%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.1 In
18:00

NE
NE

 12 / 25 mph 66 / 66°F 76% 1018 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
0.0 In
Fri 07
Jun		00:00

NE
NE

 4 / 8 mph 54 / 54°F 87% 1007 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
0.0 In
06:00

NNE
NNE

 7 / 15 mph 54 / 52°F 87% 1015 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: low
8%
0.0 In
12:00

WSW
WSW

 7 / 15 mph 62 / 62°F 75% 1007 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
18:00

NE
NE

 12 / 24 mph 66 / 66°F 83% 1011 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
34%
0.0 In
Sat 08
Jun		00:00

W
W

 2 / 5 mph 52 / 52°F 94% 1008 mb
Low level cloud: 64%
Mid level cloud: 8%
High level cloud: 12%
Most Significant Cloud Type: low
68%
0.0 In
06:00

NE
NE

 6 / 14 mph 58 / 56°F 92% 1011 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 81%
Most Significant Cloud Type: low
97%
0.0 In
12:00

SSW
SSW

 6 / 13 mph 55 / 53°F 92% 1009 mb
Low level cloud: 82%
Mid level cloud: 98%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.2 In
18:00

NE
NE

 8 / 16 mph 63 / 63°F 95% 1009 mb
Low level cloud: 82%
Mid level cloud: 92%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.2 In
Sun 09
Jun		00:00

S
S

 7 / 14 mph 50 / 48°F 90% 1011 mb
Low level cloud: 24%
Mid level cloud: 21%
High level cloud: 53%
Most Significant Cloud Type: low
38%
0.0 In
06:00

ENE
ENE

 4 / 8 mph 61 / 61°F 95% 1008 mb
Low level cloud: 63%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
82%
0.0 In
12:00

S
S

 10 / 21 mph 60 / 60°F 69% 1010 mb
Low level cloud: 52%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: low
62%
0.0 In
18:00

SSW
SSW

 1 / 3 mph 67 / 67°F 91% 1008 mb
Low level cloud: 47%
Mid level cloud: 57%
High level cloud: 20%
Most Significant Cloud Type: low
68%
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