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Sunningdale 14 Day Long Range Forecast

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

Berkshire, United Kingdom

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

Over the next 14 days the Sunningdale forecast suggests the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 21°C expected on the evening of Sunday 2nd. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Sunday 2nd at 6°C. The fortnight ahead will remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 02
Jun
15:00

NNW
NNW

11 / 14 mph 69 / 68°F 61% 1026 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

8 / 9 mph 69 / 68°F 70% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

5 / 8 mph 62 / 60°F 90% 1026 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Jun
00:00

NW
NW

7 / 11 mph 53 / 51°F 94% 1025 mb
Low level cloud: 24%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

5 / 10 mph 50 / 48°F 95% 1024 mb
Low level cloud: 65%
Mid level cloud: 17%
High level cloud: 60%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

8 / 11 mph 55 / 51°F 90% 1023 mb
Low level cloud: 38%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

11 / 13 mph 60 / 60°F 80% 1022 mb
Low level cloud: 98%
Mid level cloud: 17%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

9 / 11 mph 63 / 63°F 75% 1022 mb
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

8 / 10 mph 64 / 64°F 73% 1021 mb
Low level cloud: 78%
Mid level cloud: 47%
High level cloud: 54%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

5 / 6 mph 67 / 64°F 82% 1019 mb
Low level cloud: 44%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

3 / 6 mph 60 / 58°F 91% 1019 mb
Low level cloud: 27%
Mid level cloud: 48%
High level cloud: 11%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 04
Jun
00:00

WSW
WSW

1 / 2 mph 54 / 54°F 93% 1018 mb
Low level cloud: 86%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

4 / 7 mph 55 / 55°F 93% 1015 mb
Low level cloud: 86%
Mid level cloud: 17%
High level cloud: 20%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

8 / 11 mph 57 / 54°F 92% 1014 mb
Low level cloud: 45%
Mid level cloud: 48%
High level cloud: 26%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

12 / 14 mph 63 / 62°F 74% 1012 mb
Low level cloud: 67%
Mid level cloud: 57%
High level cloud: 22%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

15 / 17 mph 68 / 66°F 66% 1011 mb
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

17 / 21 mph 68 / 67°F 63% 1009 mb
Low level cloud: 33%
Mid level cloud: 7%
High level cloud: 11%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

14 / 19 mph 59 / 55°F 78% 1010 mb
Low level cloud: 4%
Mid level cloud: 59%
High level cloud: 22%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

9 / 13 mph 56 / 52°F 90% 1011 mb
Low level cloud: 29%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 05
Jun
00:00

WNW
WNW

4 / 8 mph 50 / 48°F 95% 1012 mb
Low level cloud: 68%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

4 / 6 mph 49 / 47°F 92% 1013 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

4 / 5 mph 50 / 48°F 79% 1015 mb
Low level cloud: 13%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

9 / 10 mph 57 / 54°F 53% 1015 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

9 / 11 mph 59 / 57°F 50% 1016 mb
Low level cloud: 15%
Mid level cloud: 81%
High level cloud: 2%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

8 / 9 mph 60 / 58°F 54% 1017 mb
Low level cloud: 11%
Mid level cloud: 25%
High level cloud: 11%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

6 / 7 mph 60 / 58°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 6%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

6 / 11 mph 51 / 48°F 81% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 06
Jun
00:00

NW
NW

5 / 9 mph 47 / 45°F 83% 1018 mb
Low level cloud: 7%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

4 / 7 mph 45 / 43°F 82% 1018 mb
Low level cloud: 18%
Mid level cloud: 27%
High level cloud: 4%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

3 / 5 mph 48 / 47°F 76% 1019 mb
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

6 / 6 mph 57 / 55°F 60% 1019 mb
Low level cloud: 4%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

7 / 8 mph 61 / 60°F 55% 1018 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

8 / 10 mph 61 / 60°F 60% 1017 mb
Low level cloud: 64%
Mid level cloud: 45%
High level cloud: 50%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

8 / 10 mph 61 / 59°F 72% 1017 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

7 / 10 mph 55 / 51°F 88% 1017 mb
Low level cloud: 49%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Jun
00:00

WSW
WSW

6 / 11 mph 47 / 44°F 92% 1016 mb
Low level cloud: 6%
Mid level cloud: 25%
High level cloud: 3%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

7 / 14 mph 46 / 42°F 91% 1015 mb
Low level cloud: 1%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

12 / 18 mph 49 / 45°F 86% 1014 mb
Low level cloud: 91%
Mid level cloud: 38%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

15 / 17 mph 58 / 55°F 72% 1014 mb
Low level cloud: 72%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

14 / 16 mph 63 / 62°F 55% 1015 mb
Low level cloud: 45%
Mid level cloud: 4%
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

W
W

16 / 19 mph 64 / 62°F 55% 1014 mb
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

14 / 17 mph 61 / 60°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

10 / 13 mph 53 / 49°F 82% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 8%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Jun
00:00

WSW
WSW

9 / 16 mph 47 / 43°F 91% 1017 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

8 / 16 mph 46 / 41°F 93% 1017 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

9 / 12 mph 52 / 47°F 84% 1018 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 25%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

11 / 12 mph 57 / 54°F 66% 1019 mb
Low level cloud: 74%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

10 / 12 mph 60 / 60°F 57% 1019 mb
Low level cloud: 89%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

11 / 13 mph 61 / 60°F 60% 1019 mb
Low level cloud: 92%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

7 / 9 mph 61 / 59°F 71% 1019 mb
Low level cloud: 20%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 9 mph 55 / 52°F 84% 1020 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 19%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 09
Jun
00:00

NE
NE

7 / 12 mph 57 / 55°F 93% 1017 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
06:00

ENE
ENE

7 / 12 mph 56 / 54°F 87% 1021 mb
Low level cloud: 22%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
12:00

E
E

10 / 16 mph 71 / 71°F 55% 1023 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
18:00

NW
NW

5 / 9 mph 73 / 76°F 63% 1015 mb
Low level cloud: 18%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
Mon 10
Jun
00:00

NNE
NNE

5 / 8 mph 54 / 52°F 91% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NW
NW

9 / 17 mph 50 / 46°F 86% 1008 mb
Low level cloud: 14%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
12:00

WNW
WNW

10 / 14 mph 64 / 64°F 58% 1019 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

11 / 20 mph 65 / 65°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
Tue 11
Jun
00:00

NE
NE

5 / 9 mph 56 / 55°F 91% 1024 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
06:00

NNW
NNW

6 / 10 mph 52 / 50°F 84% 1021 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: medium
66%
0.0 In
12:00

NNW
NNW

2 / 4 mph 72 / 76°F 52% 1026 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: low
10%
0.0 In
18:00

NNW
NNW

4 / 8 mph 69 / 69°F 66% 1021 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
0.0 In
Wed 12
Jun
00:00

SSW
SSW

4 / 7 mph 54 / 53°F 89% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
06:00

WSW
WSW

6 / 11 mph 55 / 54°F 86% 1019 mb
Low level cloud: 6%
Mid level cloud: 56%
High level cloud: 89%
Most Significant Cloud Type: medium
77%
0.0 In
12:00

ESE
ESE

5 / 8 mph 70 / 70°F 51% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

W
W

11 / 20 mph 65 / 65°F 72% 1014 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
Thu 13
Jun
00:00

ESE
ESE

3 / 6 mph 56 / 57°F 76% 1022 mb
Low level cloud: 0%
Mid level cloud: 90%
High level cloud: 31%
Most Significant Cloud Type: medium
90%
0.0 In
06:00

WSW
WSW

5 / 9 mph 57 / 56°F 89% 1014 mb
Low level cloud: 38%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: low
46%
0.0 In
12:00

ESE
ESE

4 / 7 mph 75 / 77°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 34%
Most Significant Cloud Type: medium
24%
0.0 In
18:00

W
W

11 / 21 mph 58 / 56°F 80% 1013 mb
Low level cloud: 59%
Mid level cloud: 49%
High level cloud: 11%
Most Significant Cloud Type: low
77%
0.0 In
Fri 14
Jun
00:00

ENE
ENE

4 / 7 mph 61 / 61°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
06:00

WSW
WSW

4 / 9 mph 56 / 56°F 85% 1014 mb
Low level cloud: 14%
Mid level cloud: 29%
High level cloud: 45%
Most Significant Cloud Type: low
29%
0.0 In
12:00

NNE
NNE

4 / 7 mph 77 / 78°F 52% 1015 mb
Low level cloud: 23%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
18:00

SW
SW

12 / 26 mph 62 / 62°F 88% 1011 mb
Low level cloud: 57%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
73%
0.1 In
Sat 15
Jun
00:00

ENE
ENE

5 / 9 mph 64 / 64°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

WSW
WSW

11 / 24 mph 54 / 51°F 89% 1008 mb
Low level cloud: 60%
Mid level cloud: 50%
High level cloud: 46%
Most Significant Cloud Type: low
83%
0.0 In
12:00

E
E

9 / 15 mph 76 / 78°F 52% 1014 mb
Low level cloud: 21%
Mid level cloud: 24%
High level cloud: 12%
Most Significant Cloud Type: low
30%
0.0 In
18:00

N
N

12 / 26 mph 60 / 60°F 84% 1010 mb
Low level cloud: 86%
Mid level cloud: 31%
High level cloud: 3%
Most Significant Cloud Type: low
97%
0.1 In
Sun 16
Jun
00:00

ENE
ENE

8 / 13 mph 62 / 62°F 79% 1012 mb
Low level cloud: 10%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

ENE
ENE

3 / 7 mph 54 / 54°F 75% 1015 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
12:00

SE
SE

12 / 23 mph 72 / 76°F 77% 1006 mb
Low level cloud: 58%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: low
78%
0.1 In
18:00

SSW
SSW

7 / 15 mph 67 / 67°F 68% 1015 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: low
20%
0.0 In
Mon 17
Jun
00:00

WSW
WSW

6 / 12 mph 61 / 61°F 96% 1006 mb
Low level cloud: 32%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
47%
0.3 In
06:00

S
S

3 / 6 mph 57 / 58°F 84% 1015 mb
Low level cloud: 10%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

S
S

10 / 22 mph 67 / 67°F 70% 1005 mb
Low level cloud: 67%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

6 / 12 mph 61 / 60°F 80% 1014 mb
Low level cloud: 38%
Mid level cloud: 60%
High level cloud: 35%
Most Significant Cloud Type: low
63%
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