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Hounslow 14 Day Long Range Forecast

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

Middlesex, United Kingdom

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

Over the next 14 days the Hounslow forecast suggests the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 21°C expected on the evening of Tuesday 29th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Sunday 20th at 6°C. Expect the coming 14 days to have most days seeing a little rain. The indicators are that Saturday 26th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 20
Apr
12:00

ENE
ENE

8 / 9 mph 60 / 57°F 48% 1007 mb
Low level cloud: 41%
Mid level cloud: 32%
High level cloud: 2%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

8 / 9 mph 59 / 57°F 55% 1006 mb
Low level cloud: 96%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

7 / 8 mph 56 / 55°F 64% 1006 mb
Low level cloud: 72%
Mid level cloud: 85%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

6 / 7 mph 52 / 50°F 75% 1008 mb
Low level cloud: 54%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 21
Apr
00:00

E
E

4 / 4 mph 51 / 50°F 83% 1008 mb
Low level cloud: 84%
Mid level cloud: 55%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

2 / 3 mph 50 / 50°F 85% 1007 mb
Low level cloud: 99%
Mid level cloud: 79%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

2 / 3 mph 50 / 50°F 91% 1008 mb
Low level cloud: 82%
Mid level cloud: 87%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

1 / 1 mph 52 / 51°F 89% 1009 mb
Low level cloud: 57%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

4 / 5 mph 60 / 60°F 63% 1009 mb
Low level cloud: 69%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

7 / 10 mph 55 / 52°F 86% 1010 mb
Low level cloud: 81%
Mid level cloud: 73%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

4 / 6 mph 56 / 54°F 82% 1011 mb
Low level cloud: 28%
Mid level cloud: 55%
High level cloud: 20%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

7 / 9 mph 53 / 50°F 90% 1013 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 15%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 22
Apr
00:00

W
W

6 / 8 mph 48 / 45°F 92% 1014 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

4 / 7 mph 45 / 42°F 92% 1015 mb
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

4 / 7 mph 44 / 42°F 91% 1016 mb
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 99%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

5 / 6 mph 54 / 51°F 67% 1017 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

7 / 8 mph 62 / 60°F 43% 1017 mb
Low level cloud: 8%
Mid level cloud: 22%
High level cloud: 38%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

9 / 10 mph 62 / 60°F 41% 1016 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

9 / 10 mph 58 / 55°F 57% 1016 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

6 / 8 mph 51 / 49°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 32%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 23
Apr
00:00

S
S

4 / 5 mph 49 / 48°F 82% 1017 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 25%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

4 / 7 mph 46 / 44°F 82% 1016 mb
Low level cloud: 30%
Mid level cloud: 45%
High level cloud: 96%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

5 / 7 mph 48 / 46°F 75% 1016 mb
Low level cloud: 73%
Mid level cloud: 50%
High level cloud: 15%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

5 / 6 mph 54 / 51°F 79% 1016 mb
Low level cloud: 57%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

7 / 9 mph 59 / 56°F 63% 1016 mb
Low level cloud: 60%
Mid level cloud: 31%
High level cloud: 6%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

8 / 9 mph 58 / 56°F 61% 1016 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

7 / 8 mph 58 / 55°F 67% 1017 mb
Low level cloud: 26%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

3 / 4 mph 50 / 50°F 84% 1019 mb
Low level cloud: 4%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 24
Apr
00:00

SE
SE

2 / 4 mph 49 / 49°F 80% 1019 mb
Low level cloud: 54%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

3 / 5 mph 49 / 48°F 81% 1018 mb
Low level cloud: 64%
Mid level cloud: 65%
High level cloud: 47%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

4 / 6 mph 51 / 48°F 83% 1019 mb
Low level cloud: 33%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

5 / 6 mph 54 / 51°F 75% 1020 mb
Low level cloud: 50%
Mid level cloud: 61%
High level cloud: 1%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

5 / 6 mph 57 / 54°F 65% 1020 mb
Low level cloud: 47%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

4 / 5 mph 60 / 58°F 56% 1020 mb
Low level cloud: 28%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

3 / 4 mph 60 / 59°F 59% 1020 mb
Low level cloud: 43%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

4 / 5 mph 54 / 54°F 72% 1021 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 25
Apr
00:00

ESE
ESE

3 / 4 mph 51 / 51°F 77% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

4 / 6 mph 48 / 46°F 86% 1021 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

4 / 6 mph 48 / 47°F 86% 1021 mb
Low level cloud: 10%
Mid level cloud: 100%
High level cloud: 27%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

6 / 8 mph 54 / 51°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 79%
High level cloud: 4%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

8 / 10 mph 58 / 55°F 68% 1021 mb
Low level cloud: 46%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

9 / 10 mph 63 / 62°F 56% 1019 mb
Low level cloud: 44%
Mid level cloud: 59%
High level cloud: 4%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

7 / 9 mph 60 / 59°F 69% 1019 mb
Low level cloud: 88%
Mid level cloud: 21%
High level cloud: 6%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

6 / 7 mph 56 / 55°F 75% 1019 mb
Low level cloud: 46%
Mid level cloud: 97%
High level cloud: 6%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 26
Apr
00:00

S
S

5 / 6 mph 53 / 52°F 92% 1018 mb
Low level cloud: 46%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

5 / 7 mph 52 / 51°F 97% 1017 mb
Low level cloud: 94%
Mid level cloud: 96%
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

WSW
WSW

4 / 6 mph 54 / 52°F 95% 1017 mb
Low level cloud: 56%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

7 / 8 mph 59 / 56°F 73% 1017 mb
Low level cloud: 37%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

10 / 12 mph 64 / 63°F 56% 1017 mb
Low level cloud: 66%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

12 / 16 mph 64 / 63°F 58% 1017 mb
Low level cloud: 44%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NW
NW

9 / 11 mph 63 / 61°F 69% 1018 mb
Low level cloud: 6%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

6 / 10 mph 53 / 51°F 87% 1020 mb
Low level cloud: 8%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 27
Apr
00:00

N
N

4 / 8 mph 52 / 51°F 80% 1030 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

SE
SE

2 / 4 mph 53 / 53°F 77% 1029 mb
Low level cloud: 13%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
12:00

ENE
ENE

3 / 6 mph 66 / 67°F 40% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NNE
NNE

9 / 13 mph 66 / 66°F 53% 1027 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Mon 28
Apr
00:00

NE
NE

8 / 14 mph 54 / 52°F 74% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

WNW
WNW

3 / 5 mph 60 / 60°F 85% 1029 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 38%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

NE
NE

6 / 14 mph 67 / 67°F 53% 1028 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
18:00

SSE
SSE

7 / 15 mph 72 / 76°F 56% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
Tue 29
Apr
00:00

ENE
ENE

5 / 10 mph 60 / 60°F 83% 1030 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

SE
SE

8 / 16 mph 59 / 58°F 71% 1018 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 8%
Most Significant Cloud Type: medium
20%
0.0 In
12:00

ENE
ENE

8 / 17 mph 69 / 69°F 47% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

SE
SE

10 / 20 mph 70 / 70°F 54% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 30
Apr
00:00

E
E

2 / 5 mph 64 / 64°F 69% 1029 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 11%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

E
E

6 / 11 mph 62 / 62°F 83% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
0.0 In
12:00

WNW
WNW

8 / 16 mph 73 / 77°F 52% 1026 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
9%
0.0 In
18:00

S
S

6 / 12 mph 75 / 78°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 01
May
00:00

NW
NW

9 / 18 mph 58 / 56°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

ENE
ENE

4 / 9 mph 63 / 63°F 74% 1017 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: medium
26%
0.0 In
12:00

NNW
NNW

11 / 23 mph 55 / 52°F 57% 1018 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

5 / 10 mph 80 / 82°F 57% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 62%
Most Significant Cloud Type: medium
10%
0.0 In
Fri 02
May
00:00

N
N

12 / 26 mph 48 / 43°F 75% 1019 mb
Low level cloud: 62%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
06:00

NE
NE

8 / 16 mph 59 / 60°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 20%
Most Significant Cloud Type: medium
44%
0.0 In
12:00

N
N

16 / 34 mph 50 / 45°F 53% 1020 mb
Low level cloud: 71%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

6 / 13 mph 64 / 64°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: medium
82%
0.1 In
Sat 03
May
00:00

WNW
WNW

3 / 6 mph 48 / 47°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 37%
Most Significant Cloud Type: medium
48%
0.0 In
06:00

NNE
NNE

6 / 14 mph 54 / 53°F 95% 1012 mb
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.1 In
12:00

W
W

9 / 20 mph 58 / 56°F 44% 1014 mb
Low level cloud: 0%
Mid level cloud: 74%
High level cloud: 97%
Most Significant Cloud Type: medium
77%
0.0 In
18:00

ENE
ENE

4 / 9 mph 61 / 61°F 92% 1009 mb
Low level cloud: 83%
Mid level cloud: 25%
High level cloud: 9%
Most Significant Cloud Type: low
93%
0.1 In
Sun 04
May
00:00

SSW
SSW

6 / 14 mph 50 / 47°F 87% 1009 mb
Low level cloud: 13%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

ENE
ENE

7 / 15 mph 55 / 53°F 97% 1007 mb
Low level cloud: 79%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
94%
0.0 In
12:00

S
S

9 / 18 mph 58 / 56°F 57% 1004 mb
Low level cloud: 66%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
86%
0.0 In
18:00

E
E

6 / 14 mph 60 / 60°F 96% 1007 mb
Low level cloud: 77%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Mon 05
May
00:00

WSW
WSW

5 / 11 mph 54 / 53°F 87% 1002 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
06:00

ESE
ESE

4 / 7 mph 60 / 60°F 95% 1007 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 46%
Most Significant Cloud Type: low
91%
0.2 In
12:00

WNW
WNW

16 / 33 mph 53 / 49°F 37% 1002 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
0.0 In
18:00

S
S

6 / 12 mph 73 / 77°F 60% 1008 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 87%
Most Significant Cloud Type: medium
21%
0.0 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