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Thames 14 Day Long Range Forecast

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

Hounslow, United Kingdom

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

The next 14 day outlook for Thames shows the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 23°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Tuesday 21st at 9°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The indicators are that Monday 27th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 19
May
12:00

NE
NE

10 / 12 mph 72 / 76°F 48% 1014 mb
Low level cloud: 11%
Mid level cloud: 18%
High level cloud: 5%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

11 / 13 mph 73 / 75°F 42% 1013 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

11 / 13 mph 70 / 68°F 61% 1014 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 9 mph 65 / 65°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNE
NNE

7 / 8 mph 57 / 56°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

7 / 8 mph 53 / 51°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

9 / 12 mph 52 / 47°F 85% 1015 mb
Low level cloud: 29%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

10 / 12 mph 60 / 57°F 67% 1015 mb
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 13 mph 66 / 65°F 59% 1013 mb
Low level cloud: 35%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

11 / 13 mph 67 / 65°F 60% 1012 mb
Low level cloud: 57%
Mid level cloud: 19%
High level cloud: 5%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

11 / 13 mph 66 / 64°F 66% 1011 mb
Low level cloud: 48%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

9 / 10 mph 57 / 55°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

7 / 8 mph 53 / 50°F 78% 1011 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 8 mph 50 / 47°F 82% 1009 mb
Low level cloud: 4%
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
06:00

N
N

7 / 9 mph 51 / 47°F 86% 1009 mb
Low level cloud: 43%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

7 / 8 mph 55 / 53°F 81% 1009 mb
Low level cloud: 84%
Mid level cloud: 32%
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

NNE
NNE

5 / 6 mph 59 / 58°F 79% 1008 mb
Low level cloud: 96%
Mid level cloud: 67%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

6 / 7 mph 59 / 59°F 81% 1008 mb
Low level cloud: 91%
Mid level cloud: 45%
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

NW
NW

6 / 7 mph 58 / 57°F 92% 1008 mb
Low level cloud: 94%
Mid level cloud: 44%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 7 mph 56 / 55°F 94% 1009 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

WNW
WNW

5 / 7 mph 54 / 53°F 93% 1008 mb
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

5 / 7 mph 53 / 51°F 91% 1009 mb
Low level cloud: 29%
Mid level cloud: 26%
High level cloud: 21%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

6 / 8 mph 54 / 51°F 91% 1009 mb
Low level cloud: 41%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

8 / 9 mph 61 / 60°F 75% 1010 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

12 / 15 mph 67 / 65°F 62% 1010 mb
Low level cloud: 66%
Mid level cloud: 25%
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

W
W

12 / 16 mph 66 / 66°F 62% 1010 mb
Low level cloud: 91%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

9 / 12 mph 66 / 64°F 79% 1011 mb
Low level cloud: 9%
Mid level cloud: 19%
High level cloud: 2%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

5 / 8 mph 57 / 56°F 94% 1013 mb
Low level cloud: 6%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

W
W

5 / 7 mph 55 / 54°F 95% 1014 mb
Low level cloud: 9%
Mid level cloud: 14%
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

WNW
WNW

4 / 6 mph 52 / 51°F 95% 1015 mb
Low level cloud: 20%
Mid level cloud: 18%
High level cloud: 17%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

3 / 4 mph 55 / 53°F 89% 1017 mb
Low level cloud: 28%
Mid level cloud: 10%
High level cloud: 21%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

4 / 5 mph 64 / 62°F 66% 1017 mb
Low level cloud: 70%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

6 / 7 mph 67 / 65°F 57% 1018 mb
Low level cloud: 73%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

6 / 8 mph 68 / 65°F 58% 1018 mb
Low level cloud: 50%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

8 / 10 mph 65 / 62°F 75% 1019 mb
Low level cloud: 39%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

8 / 10 mph 57 / 55°F 89% 1021 mb
Low level cloud: 65%
Mid level cloud: 25%
High level cloud: 8%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

ENE
ENE

7 / 9 mph 55 / 53°F 86% 1022 mb
Low level cloud: 75%
Mid level cloud: 25%
High level cloud: 7%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

6 / 8 mph 52 / 50°F 89% 1022 mb
Low level cloud: 53%
Mid level cloud: 20%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

6 / 7 mph 54 / 50°F 83% 1022 mb
Low level cloud: 62%
Mid level cloud: 18%
High level cloud: 5%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 5 mph 61 / 59°F 68% 1023 mb
Low level cloud: 57%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

5 / 6 mph 66 / 64°F 59% 1022 mb
Low level cloud: 81%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

6 / 8 mph 67 / 65°F 58% 1022 mb
Low level cloud: 78%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

7 / 8 mph 67 / 65°F 63% 1022 mb
Low level cloud: 19%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

6 / 7 mph 60 / 58°F 79% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

E
E

5 / 6 mph 54 / 53°F 85% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

4 / 6 mph 51 / 50°F 88% 1021 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 83%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

5 / 8 mph 55 / 53°F 81% 1020 mb
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

9 / 11 mph 67 / 65°F 64% 1019 mb
Low level cloud: 28%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

12 / 14 mph 71 / 69°F 56% 1017 mb
Low level cloud: 42%
Mid level cloud: 19%
High level cloud: 98%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

11 / 13 mph 72 / 69°F 56% 1015 mb
Low level cloud: 35%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

8 / 9 mph 67 / 66°F 72% 1014 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

4 / 6 mph 61 / 61°F 90% 1013 mb
Low level cloud: 16%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 26
May
00:00

ENE
ENE

6 / 12 mph 61 / 61°F 87% 1014 mb
Low level cloud: 4%
Mid level cloud: 83%
High level cloud: 33%
Most Significant Cloud Type: medium
95%
0.0 In
06:00

ESE
ESE

5 / 10 mph 62 / 62°F 79% 1020 mb
Low level cloud: 10%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
39%
0.0 In
12:00

SSW
SSW

11 / 22 mph 66 / 66°F 54% 1007 mb
Low level cloud: 18%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
37%
0.0 In
18:00

ESE
ESE

8 / 17 mph 71 / 71°F 75% 1012 mb
Low level cloud: 4%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: medium
90%
0.0 In
Mon 27
May
00:00

SSW
SSW

5 / 11 mph 57 / 57°F 93% 1017 mb
Low level cloud: 47%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
06:00

NNE
NNE

8 / 16 mph 59 / 59°F 90% 1018 mb
Low level cloud: 63%
Mid level cloud: 16%
High level cloud: 4%
Most Significant Cloud Type: low
69%
0.0 In
12:00

ENE
ENE

8 / 17 mph 63 / 63°F 68% 1016 mb
Low level cloud: 20%
Mid level cloud: 79%
High level cloud: 60%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

WNW
WNW

5 / 11 mph 66 / 66°F 89% 1016 mb
Low level cloud: 54%
Mid level cloud: 77%
High level cloud: 38%
Most Significant Cloud Type: low
86%
0.0 In
Tue 28
May
00:00

NNE
NNE

9 / 19 mph 55 / 53°F 91% 1018 mb
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 51%
Most Significant Cloud Type: low
100%
0.1 In
06:00

N
N

6 / 13 mph 55 / 54°F 93% 1017 mb
Low level cloud: 56%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.1 In
12:00

NNE
NNE

15 / 31 mph 62 / 62°F 62% 1017 mb
Low level cloud: 36%
Mid level cloud: 80%
High level cloud: 18%
Most Significant Cloud Type: low
66%
0.0 In
18:00

NE
NE

6 / 13 mph 71 / 71°F 66% 1016 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
Wed 29
May
00:00

NNE
NNE

11 / 23 mph 55 / 52°F 86% 1016 mb
Low level cloud: 22%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
06:00

NNE
NNE

6 / 12 mph 58 / 57°F 87% 1017 mb
Low level cloud: 40%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
12:00

NNE
NNE

9 / 18 mph 60 / 60°F 90% 1015 mb
Low level cloud: 99%
Mid level cloud: 58%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.1 In
18:00

ENE
ENE

5 / 11 mph 65 / 65°F 76% 1014 mb
Low level cloud: 68%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
72%
0.0 In
Thu 30
May
00:00

NNE
NNE

8 / 17 mph 57 / 55°F 95% 1015 mb
Low level cloud: 100%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

5 / 10 mph 64 / 64°F 83% 1013 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

NNE
NNE

8 / 16 mph 63 / 63°F 75% 1015 mb
Low level cloud: 96%
Mid level cloud: 32%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

9 / 20 mph 71 / 71°F 70% 1009 mb
Low level cloud: 20%
Mid level cloud: 15%
High level cloud: 14%
Most Significant Cloud Type: low
26%
0.0 In
Fri 31
May
00:00

N
N

6 / 14 mph 60 / 60°F 91% 1015 mb
Low level cloud: 65%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: low
71%
0.0 In
06:00

SSE
SSE

3 / 6 mph 61 / 61°F 96% 1007 mb
Low level cloud: 83%
Mid level cloud: 45%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.2 In
12:00

NNW
NNW

4 / 9 mph 60 / 60°F 88% 1015 mb
Low level cloud: 87%
Mid level cloud: 77%
High level cloud: 36%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

8 / 16 mph 71 / 71°F 65% 1010 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.1 In
Sat 01
Jun
00:00

W
W

3 / 6 mph 62 / 62°F 94% 1012 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 53%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

2 / 4 mph 60 / 60°F 73% 1011 mb
Low level cloud: 3%
Mid level cloud: 42%
High level cloud: 2%
Most Significant Cloud Type: medium
51%
0.0 In
12:00

SW
SW

6 / 12 mph 68 / 68°F 79% 1009 mb
Low level cloud: 59%
Mid level cloud: 19%
High level cloud: 4%
Most Significant Cloud Type: low
66%
0.1 In
18:00

SSE
SSE

5 / 10 mph 64 / 64°F 82% 1011 mb
Low level cloud: 97%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sun 02
Jun
00:00

SW
SW

4 / 7 mph 64 / 64°F 97% 1010 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.3 In
06:00

E
E

2 / 4 mph 60 / 60°F 98% 1008 mb
Low level cloud: 100%
Mid level cloud: 49%
High level cloud: 39%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SW
SW

4 / 9 mph 75 / 77°F 52% 1011 mb
Low level cloud: 55%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: low
58%
0.0 In
18:00

SSW
SSW

8 / 16 mph 69 / 69°F 65% 1011 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 14%
Most Significant Cloud Type: medium
9%
0.0 In
Mon 03
Jun
00:00

SSW
SSW

2 / 4 mph 72 / 76°F 91% 1013 mb
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
0.0 In
06:00

SSW
SSW

6 / 13 mph 58 / 58°F 91% 1012 mb
Low level cloud: 33%
Mid level cloud: 9%
High level cloud: 82%
Most Significant Cloud Type: low
45%
0.0 In
12:00

E
E

16 / 33 mph 71 / 71°F 60% 1009 mb
Low level cloud: 25%
Mid level cloud: 63%
High level cloud: 18%
Most Significant Cloud Type: low
48%
0.0 In
18:00

S
S

8 / 16 mph 71 / 71°F 58% 1012 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
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