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Porterfield 14 Day Long Range Forecast

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

Renfrewshire, United Kingdom

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

For Porterfield in the coming two weeks the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 17°C expected on the afternoon of Wednesday 10th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Friday 19th at 4°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Predictions are Sunday 14th will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 10
Sep
12:00

SE
SE

14 / 16 mph 63 / 63°F 72% 996 mb
Low level cloud: 95%
Mid level cloud: 47%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

12 / 15 mph 61 / 61°F 81% 992 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 95%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

11 / 15 mph 56 / 53°F 92% 990 mb
Low level cloud: 60%
Mid level cloud: 95%
High level cloud: 33%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

12 / 16 mph 53 / 49°F 95% 991 mb
Low level cloud: 98%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Thu 11
Sep
00:00

SW
SW

14 / 19 mph 52 / 47°F 94% 991 mb
Low level cloud: 77%
Mid level cloud: 60%
High level cloud: 4%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SW
SW

16 / 24 mph 50 / 44°F 92% 991 mb
Low level cloud: 81%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

SW
SW

15 / 21 mph 51 / 46°F 91% 992 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

15 / 20 mph 55 / 51°F 90% 993 mb
Low level cloud: 63%
Mid level cloud: 40%
High level cloud: 33%
Most Significant Cloud Type: low
80%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SW
SW

14 / 20 mph 56 / 52°F 89% 993 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

13 / 19 mph 54 / 50°F 90% 994 mb
Low level cloud: 50%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

7 / 11 mph 52 / 49°F 92% 995 mb
Low level cloud: 19%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

5 / 10 mph 47 / 44°F 95% 996 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 12
Sep
00:00

SW
SW

4 / 9 mph 45 / 43°F 96% 998 mb
Low level cloud: 19%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

5 / 10 mph 45 / 42°F 97% 999 mb
Low level cloud: 32%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

6 / 11 mph 46 / 43°F 97% 1000 mb
Low level cloud: 59%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

11 / 13 mph 55 / 51°F 90% 1001 mb
Low level cloud: 81%
Mid level cloud: 16%
High level cloud: 19%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

12 / 17 mph 57 / 54°F 83% 1002 mb
Low level cloud: 57%
Mid level cloud: 52%
High level cloud: 88%
Most Significant Cloud Type: low
85%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SSW
SSW

11 / 16 mph 58 / 55°F 83% 1002 mb
Low level cloud: 33%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

S
S

8 / 13 mph 53 / 49°F 89% 1002 mb
Low level cloud: 12%
Mid level cloud: 28%
High level cloud: 55%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

4 / 9 mph 45 / 43°F 95% 1001 mb
Low level cloud: 5%
Mid level cloud: 34%
High level cloud: 32%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 13
Sep
00:00

E
E

6 / 11 mph 46 / 43°F 95% 999 mb
Low level cloud: 50%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

6 / 8 mph 50 / 47°F 97% 996 mb
Low level cloud: 84%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
06:00

SW
SW

7 / 9 mph 48 / 46°F 95% 999 mb
Low level cloud: 74%
Mid level cloud: 56%
High level cloud: 69%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

9 / 11 mph 53 / 50°F 89% 1000 mb
Low level cloud: 74%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

11 / 13 mph 58 / 54°F 75% 1001 mb
Low level cloud: 46%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

12 / 15 mph 57 / 54°F 79% 1002 mb
Low level cloud: 75%
Mid level cloud: 26%
High level cloud: 76%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

13 / 17 mph 53 / 49°F 97% 1002 mb
Low level cloud: 89%
Mid level cloud: 85%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

13 / 19 mph 51 / 47°F 94% 1004 mb
Low level cloud: 91%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Sep
00:00

SW
SW

9 / 14 mph 49 / 46°F 94% 1005 mb
Low level cloud: 68%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

5 / 11 mph 44 / 41°F 96% 1004 mb
Low level cloud: 22%
Mid level cloud: 28%
High level cloud: 74%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

5 / 11 mph 45 / 42°F 95% 1000 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

11 / 14 mph 51 / 46°F 96% 993 mb
Low level cloud: 97%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

ESE
ESE

8 / 10 mph 54 / 52°F 94% 987 mb
Low level cloud: 98%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
15:00

SW
SW

10 / 15 mph 59 / 56°F 90% 983 mb
Low level cloud: 15%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

16 / 24 mph 55 / 50°F 92% 982 mb
Low level cloud: 64%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
82%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

13 / 17 mph 54 / 50°F 95% 981 mb
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Sep
00:00

SW
SW

11 / 14 mph 54 / 50°F 96% 981 mb
Low level cloud: 93%
Mid level cloud: 78%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

12 / 17 mph 53 / 49°F 94% 982 mb
Low level cloud: 85%
Mid level cloud: 40%
High level cloud: 9%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

17 / 26 mph 52 / 47°F 97% 982 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

WSW
WSW

16 / 23 mph 54 / 49°F 94% 984 mb
Low level cloud: 96%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

W
W

19 / 26 mph 56 / 51°F 93% 987 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

W
W

17 / 21 mph 57 / 53°F 92% 991 mb
Low level cloud: 65%
Mid level cloud: 97%
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

W
W

14 / 18 mph 57 / 53°F 91% 993 mb
Low level cloud: 40%
Mid level cloud: 46%
High level cloud: 79%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

15 / 18 mph 55 / 51°F 91% 995 mb
Low level cloud: 77%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Sep
00:00

WSW
WSW

15 / 21 mph 52 / 48°F 90% 997 mb
Low level cloud: 82%
Mid level cloud: 29%
High level cloud: 35%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

15 / 21 mph 52 / 47°F 88% 998 mb
Low level cloud: 91%
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
06:00

WSW
WSW

15 / 21 mph 52 / 47°F 88% 999 mb
Low level cloud: 91%
Mid level cloud: 28%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

16 / 19 mph 55 / 51°F 89% 1000 mb
Low level cloud: 76%
Mid level cloud: 22%
High level cloud: 98%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

16 / 22 mph 58 / 55°F 85% 1001 mb
Low level cloud: 90%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

15 / 21 mph 57 / 53°F 86% 1002 mb
Low level cloud: 78%
Mid level cloud: 9%
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

WSW
WSW

12 / 17 mph 53 / 49°F 91% 1002 mb
Low level cloud: 69%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

8 / 14 mph 49 / 46°F 95% 1003 mb
Low level cloud: 69%
Mid level cloud: 16%
High level cloud: 4%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 17
Sep
00:00

WSW
WSW

13 / 26 mph 52 / 48°F 93% 1011 mb
Low level cloud: 74%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
06:00

WNW
WNW

1 / 3 mph 45 / 46°F 94% 1018 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
12:00

W
W

6 / 13 mph 62 / 62°F 68% 1016 mb
Low level cloud: 35%
Mid level cloud: 28%
High level cloud: 5%
Most Significant Cloud Type: low
45%
0.0 In
18:00

SW
SW

5 / 11 mph 65 / 65°F 89% 1015 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
0.0 In
Thu 18
Sep
00:00

WNW
WNW

3 / 5 mph 53 / 53°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

W
W

11 / 24 mph 51 / 47°F 93% 1009 mb
Low level cloud: 74%
Mid level cloud: 14%
High level cloud: 5%
Most Significant Cloud Type: low
79%
0.0 In
12:00

W
W

12 / 25 mph 62 / 62°F 74% 1008 mb
Low level cloud: 42%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
18:00

W
W

6 / 12 mph 62 / 62°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
0.0 In
Fri 19
Sep
00:00

WSW
WSW

2 / 4 mph 51 / 51°F 96% 1015 mb
Low level cloud: 49%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
06:00

NE
NE

5 / 10 mph 43 / 40°F 94% 1015 mb
Low level cloud: 10%
Mid level cloud: 19%
High level cloud: 85%
Most Significant Cloud Type: medium
49%
0.0 In
12:00

E
E

8 / 17 mph 61 / 61°F 72% 1018 mb
Low level cloud: 98%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
18:00

ENE
ENE

11 / 23 mph 51 / 47°F 96% 1006 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Sat 20
Sep
00:00

ENE
ENE

6 / 12 mph 55 / 53°F 84% 1018 mb
Low level cloud: 83%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

5 / 11 mph 51 / 49°F 95% 1004 mb
Low level cloud: 43%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
44%
0.2 In
12:00

E
E

3 / 6 mph 57 / 58°F 96% 1013 mb
Low level cloud: 100%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

ENE
ENE

3 / 7 mph 63 / 63°F 82% 1008 mb
Low level cloud: 10%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
Sun 21
Sep
00:00

SSW
SSW

3 / 6 mph 56 / 56°F 97% 1008 mb
Low level cloud: 55%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.3 In
06:00

NE
NE

8 / 16 mph 54 / 51°F 88% 1014 mb
Low level cloud: 81%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
12:00

SSW
SSW

8 / 17 mph 60 / 60°F 85% 1006 mb
Low level cloud: 77%
Mid level cloud: 22%
High level cloud: 19%
Most Significant Cloud Type: low
86%
0.1 In
18:00

NNE
NNE

3 / 6 mph 61 / 61°F 91% 1017 mb
Low level cloud: 60%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.0 In
Mon 22
Sep
00:00

WNW
WNW

2 / 5 mph 48 / 49°F 94% 1004 mb
Low level cloud: 9%
Mid level cloud: 31%
High level cloud: 86%
Most Significant Cloud Type: medium
59%
0.1 In
06:00

WSW
WSW

5 / 10 mph 48 / 46°F 96% 1020 mb
Low level cloud: 23%
Mid level cloud: 7%
High level cloud: 21%
Most Significant Cloud Type: low
27%
0.0 In
12:00

W
W

11 / 23 mph 61 / 61°F 72% 1007 mb
Low level cloud: 58%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
62%
0.0 In
18:00

WSW
WSW

4 / 9 mph 60 / 60°F 92% 1023 mb
Low level cloud: 20%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
Tue 23
Sep
00:00

WNW
WNW

11 / 24 mph 47 / 42°F 77% 1012 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
06:00

SSW
SSW

1 / 2 mph 47 / 47°F 97% 1023 mb
Low level cloud: 39%
Mid level cloud: 39%
High level cloud: 19%
Most Significant Cloud Type: low
54%
0.0 In
12:00

NW
NW

5 / 11 mph 57 / 56°F 73% 1017 mb
Low level cloud: 63%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
18:00

SSW
SSW

4 / 8 mph 61 / 61°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 42%
Most Significant Cloud Type: medium
11%
0.0 In
Wed 24
Sep
00:00

NNE
NNE

3 / 7 mph 47 / 45°F 81% 1022 mb
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
0.0 In
06:00

SSE
SSE

3 / 7 mph 51 / 51°F 96% 1009 mb
Low level cloud: 17%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
17%
0.0 In
12:00

ENE
ENE

5 / 10 mph 59 / 59°F 53% 1022 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SSW
SSW

3 / 7 mph 56 / 56°F 94% 1003 mb
Low level cloud: 7%
Mid level cloud: 26%
High level cloud: 92%
Most Significant Cloud Type: medium
48%
0.1 In
Thu 25
Sep
00:00

ENE
ENE

5 / 11 mph 44 / 41°F 71% 1020 mb
Low level cloud: 33%
Mid level cloud: 12%
High level cloud: 22%
Most Significant Cloud Type: low
39%
0.0 In
06:00

SW
SW

4 / 8 mph 51 / 50°F 97% 1000 mb
Low level cloud: 54%
Mid level cloud: 56%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

13 / 26 mph 52 / 48°F 56% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: medium
11%
0.0 In
18:00

W
W

10 / 22 mph 54 / 51°F 84% 1002 mb
Low level cloud: 76%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In

Other Locations Near to Porterfield

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