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Little Offley 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Little Offley

Hertfordshire, United Kingdom

Long range weather outlook for Little Offley includes 14 day forecast summary:

The outlook for Little Offley in the two weeks ahead shows the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 18°C expected on the evening of Friday 10th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Monday 13th at 3°C. Expect the following 14 days ahead to have most days seeing a little rain. The indicators are that Monday 6th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 04
May
15:00

SSE
SSE

6 / 9 mph 58 / 55°F 77% 1010 mb
Low level cloud: 34%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

3 / 5 mph 57 / 56°F 84% 1009 mb
Low level cloud: 8%
Mid level cloud: 25%
High level cloud: 8%
Most Significant Cloud Type: medium
49%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSE
SSE

5 / 9 mph 50 / 48°F 93% 1010 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 34%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
May
00:00

SSE
SSE

3 / 5 mph 49 / 49°F 93% 1009 mb
Low level cloud: 5%
Mid level cloud: 16%
High level cloud: 33%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

4 / 7 mph 47 / 46°F 94% 1009 mb
Low level cloud: 13%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

4 / 6 mph 48 / 46°F 91% 1009 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 22%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

6 / 8 mph 56 / 53°F 71% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 15%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

9 / 12 mph 59 / 57°F 66% 1008 mb
Low level cloud: 76%
Mid level cloud: 36%
High level cloud: 34%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

7 / 10 mph 56 / 53°F 83% 1007 mb
Low level cloud: 32%
Mid level cloud: 39%
High level cloud: 100%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

5 / 9 mph 58 / 55°F 85% 1007 mb
Low level cloud: 22%
Mid level cloud: 26%
High level cloud: 85%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

4 / 7 mph 52 / 51°F 93% 1007 mb
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 06
May
00:00

SSW
SSW

3 / 5 mph 51 / 51°F 93% 1007 mb
Low level cloud: 3%
Mid level cloud: 43%
High level cloud: 69%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

2 / 3 mph 50 / 50°F 91% 1007 mb
Low level cloud: 18%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

1 / 3 mph 49 / 49°F 90% 1007 mb
Low level cloud: 48%
Mid level cloud: 31%
High level cloud: 96%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

4 / 7 mph 51 / 51°F 86% 1008 mb
Low level cloud: 92%
Mid level cloud: 47%
High level cloud: 48%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

5 / 7 mph 55 / 54°F 91% 1009 mb
Low level cloud: 76%
Mid level cloud: 85%
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

ENE
ENE

6 / 8 mph 57 / 55°F 94% 1010 mb
Low level cloud: 78%
Mid level cloud: 85%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NNE
NNE

6 / 7 mph 56 / 54°F 97% 1011 mb
Low level cloud: 73%
Mid level cloud: 77%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

6 / 7 mph 53 / 51°F 98% 1014 mb
Low level cloud: 83%
Mid level cloud: 91%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 07
May
00:00

NNE
NNE

6 / 9 mph 51 / 48°F 99% 1015 mb
Low level cloud: 89%
Mid level cloud: 99%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 10 mph 50 / 47°F 97% 1017 mb
Low level cloud: 69%
Mid level cloud: 100%
High level cloud: 74%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

7 / 11 mph 50 / 46°F 93% 1019 mb
Low level cloud: 2%
Mid level cloud: 58%
High level cloud: 8%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

8 / 11 mph 56 / 52°F 76% 1020 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

8 / 10 mph 62 / 60°F 68% 1021 mb
Low level cloud: 72%
Mid level cloud: 7%
High level cloud: 13%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

8 / 12 mph 62 / 60°F 70% 1022 mb
Low level cloud: 36%
Mid level cloud: 26%
High level cloud: 36%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

6 / 9 mph 61 / 58°F 84% 1023 mb
Low level cloud: 18%
Mid level cloud: 32%
High level cloud: 91%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

6 / 10 mph 52 / 50°F 93% 1025 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 08
May
00:00

NNE
NNE

7 / 11 mph 48 / 45°F 91% 1027 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 10 mph 46 / 42°F 93% 1028 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

9 / 14 mph 46 / 41°F 93% 1029 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 14 mph 52 / 48°F 81% 1030 mb
Low level cloud: 88%
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
12:00

NNE
NNE

10 / 14 mph 54 / 51°F 76% 1030 mb
Low level cloud: 94%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

9 / 14 mph 55 / 53°F 73% 1030 mb
Low level cloud: 98%
Mid level cloud: 14%
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

NNE
NNE

7 / 11 mph 56 / 53°F 80% 1030 mb
Low level cloud: 75%
Mid level cloud: 6%
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

NE
NE

7 / 11 mph 50 / 47°F 92% 1031 mb
Low level cloud: 14%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 09
May
00:00

NE
NE

5 / 6 mph 48 / 46°F 92% 1031 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

4 / 8 mph 44 / 41°F 89% 1031 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 47%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

4 / 7 mph 44 / 42°F 82% 1031 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

5 / 8 mph 51 / 48°F 65% 1030 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

5 / 6 mph 58 / 56°F 54% 1029 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

4 / 6 mph 60 / 59°F 55% 1028 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

4 / 5 mph 60 / 59°F 73% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

2 / 3 mph 52 / 52°F 77% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 96%
Most Significant Cloud Type: high
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 10
May
00:00

SSW
SSW

2 / 3 mph 51 / 51°F 81% 1027 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

2 / 4 mph 49 / 50°F 82% 1025 mb
Low level cloud: 8%
Mid level cloud: 11%
High level cloud: 21%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

3 / 4 mph 52 / 51°F 83% 1025 mb
Low level cloud: 12%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

4 / 6 mph 60 / 59°F 74% 1024 mb
Low level cloud: 11%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

7 / 9 mph 64 / 63°F 68% 1023 mb
Low level cloud: 66%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

7 / 11 mph 64 / 63°F 70% 1022 mb
Low level cloud: 49%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

5 / 7 mph 64 / 62°F 85% 1021 mb
Low level cloud: 39%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

5 / 8 mph 58 / 57°F 96% 1021 mb
Low level cloud: 70%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 11
May
00:00

ESE
ESE

6 / 12 mph 54 / 53°F 90% 1018 mb
Low level cloud: 1%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
0.0 In
06:00

SSW
SSW

4 / 8 mph 61 / 60°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ESE
ESE

5 / 11 mph 67 / 67°F 64% 1018 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 52%
Most Significant Cloud Type: low
15%
0.0 In
18:00

ESE
ESE

8 / 15 mph 65 / 65°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Sun 12
May
00:00

SE
SE

7 / 10 mph 56 / 54°F 89% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 39%
Most Significant Cloud Type: medium
7%
0.0 In
06:00

SE
SE

3 / 7 mph 57 / 57°F 90% 1021 mb
Low level cloud: 61%
Mid level cloud: 52%
High level cloud: 15%
Most Significant Cloud Type: low
80%
0.0 In
12:00

ENE
ENE

12 / 22 mph 52 / 48°F 73% 1027 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
18:00

NE
NE

8 / 16 mph 59 / 59°F 72% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
0.0 In
Mon 13
May
00:00

ENE
ENE

6 / 11 mph 48 / 46°F 93% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

4 / 9 mph 48 / 46°F 79% 1026 mb
Low level cloud: 8%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

ENE
ENE

4 / 7 mph 64 / 64°F 54% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NE
NE

9 / 17 mph 56 / 54°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 36%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 14
May
00:00

SW
SW

5 / 10 mph 55 / 54°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
12%
0.0 In
06:00

NE
NE

6 / 12 mph 46 / 42°F 76% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

W
W

9 / 17 mph 64 / 64°F 71% 1017 mb
Low level cloud: 81%
Mid level cloud: 29%
High level cloud: 3%
Most Significant Cloud Type: low
91%
0.0 In
18:00

NE
NE

11 / 23 mph 52 / 49°F 83% 1016 mb
Low level cloud: 60%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
Wed 15
May
00:00

WNW
WNW

4 / 8 mph 56 / 55°F 89% 1015 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
67%
0.0 In
06:00

NE
NE

10 / 19 mph 45 / 40°F 94% 1014 mb
Low level cloud: 45%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
12:00

W
W

8 / 15 mph 58 / 57°F 85% 1013 mb
Low level cloud: 83%
Mid level cloud: 45%
High level cloud: 27%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

14 / 28 mph 54 / 50°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Thu 16
May
00:00

NNW
NNW

4 / 9 mph 55 / 55°F 93% 1009 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NE
NE

11 / 23 mph 44 / 38°F 91% 1012 mb
Low level cloud: 33%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: low
33%
0.0 In
12:00

WNW
WNW

13 / 25 mph 54 / 51°F 82% 1007 mb
Low level cloud: 58%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.1 In
18:00

NE
NE

13 / 26 mph 55 / 52°F 83% 1011 mb
Low level cloud: 29%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
Fri 17
May
00:00

WNW
WNW

8 / 16 mph 45 / 41°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

13 / 25 mph 48 / 43°F 94% 1014 mb
Low level cloud: 78%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
12:00

NW
NW

11 / 23 mph 51 / 47°F 66% 1017 mb
Low level cloud: 76%
Mid level cloud: 7%
High level cloud: 21%
Most Significant Cloud Type: low
80%
0.0 In
18:00

NE
NE

12 / 24 mph 54 / 51°F 82% 1017 mb
Low level cloud: 50%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
Sat 18
May
00:00

N
N

1 / 3 mph 53 / 53°F 83% 1020 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 80%
Most Significant Cloud Type: low
21%
0.0 In
06:00

NNE
NNE

8 / 16 mph 46 / 43°F 93% 1022 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
46%
0.0 In
12:00

W
W

3 / 6 mph 62 / 62°F 54% 1020 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
46%
0.0 In
18:00

NNE
NNE

6 / 13 mph 59 / 59°F 76% 1023 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 81%
Most Significant Cloud Type: medium
38%
0.0 In
Sun 19
May
00:00

SSE
SSE

4 / 7 mph 58 / 58°F 89% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
06:00

WSW
WSW

2 / 5 mph 56 / 58°F 85% 1024 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
9%
0.0 In
12:00

ESE
ESE

8 / 16 mph 64 / 64°F 60% 1020 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
7%
0.0 In
18:00

NNW
NNW

6 / 12 mph 63 / 63°F 81% 1020 mb
Low level cloud: 11%
Mid level cloud: 26%
High level cloud: 63%
Most Significant Cloud Type: low
28%
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