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Chicago 14 Day Long Range Forecast

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

Illinois, United States Of America

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

Reviewing the forecast for Chicago Over the next 14 days and the average daytime maximum temperature will be around 2°C, with a high for the two weeks of 9°C expected on the morning of Wednesday 11th. The mean minimum temperature will be -3°C, dipping to its lowest on the morning of Tuesday 17th at -15°C. The coming 14 days will have some days seeing a little precipitation and some days with rain or snow. It looks like Sunday 15th will have the most precipitation with an accumulation of around 39.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 10
Mar		00:00

SSW
SSW

 9 / 13 mph 60 / 60°F 96% 1007 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 9 / 15 mph 57 / 56°F 96% 1007 mb
Low level cloud: 68%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 4 / 7 mph 56 / 56°F 98% 1009 mb
Low level cloud: 93%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 9 / 10 mph 49 / 46°F 76% 1012 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 9 / 11 mph 48 / 43°F 68% 1013 mb
Low level cloud: 84%
Mid level cloud: 0%
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

ENE
ENE

 9 / 10 mph 50 / 46°F 70% 1010 mb
Low level cloud: 65%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 8 / 12 mph 50 / 46°F 85% 1008 mb
Low level cloud: 69%
Mid level cloud: 7%
High level cloud: 66%
Most Significant Cloud Type: low
79%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ENE
ENE

 4 / 7 mph 48 / 47°F 95% 1005 mb
Low level cloud: 86%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
Wed 11
Mar		18:00

NNW
NNW

 13 / 16 mph 36 / 28°F 75% 1017 mb
Low level cloud: 99%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 14 / 16 mph 36 / 28°F 64% 1020 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
Thu 12
Mar		00:00

NW
NW

 9 / 11 mph 34 / 27°F 68% 1022 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
03:00

W
W

 7 / 9 mph 32 / 26°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 7 / 10 mph 32 / 25°F 73% 1023 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 9 / 11 mph 36 / 29°F 58% 1023 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
12:00

WNW
WNW

 9 / 10 mph 42 / 36°F 36% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 9 / 10 mph 45 / 40°F 29% 1019 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 7 / 10 mph 45 / 41°F 37% 1015 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 15 / 22 mph 44 / 37°F 44% 1010 mb
Low level cloud: 6%
Mid level cloud: 100%
High level cloud: 43%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 13
Mar		00:00

S
S

 22 / 30 mph 44 / 36°F 49% 1001 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 93%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 24 / 33 mph 45 / 36°F 57% 997 mb
Low level cloud: 54%
Mid level cloud: 76%
High level cloud: 41%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 24 / 36 mph 48 / 40°F 48% 994 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 23 / 27 mph 40 / 29°F 47% 999 mb
Low level cloud: 39%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 24 / 28 mph 41 / 31°F 50% 1002 mb
Low level cloud: 98%
Mid level cloud: 44%
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

WNW
WNW

 18 / 21 mph 42 / 34°F 43% 1009 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 14 / 16 mph 40 / 33°F 45% 1015 mb
Low level cloud: 12%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 9 / 10 mph 38 / 32°F 52% 1019 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 14
Mar		00:00

NNW
NNW

 6 / 7 mph 34 / 29°F 54% 1020 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 17%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 5 mph 33 / 29°F 54% 1022 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 54%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 5 / 6 mph 31 / 25°F 68% 1022 mb
Low level cloud: 7%
Mid level cloud: 100%
High level cloud: 21%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 7 / 8 mph 30 / 23°F 86% 1023 mb
Low level cloud: 89%
Mid level cloud: 68%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

ESE
ESE

 8 / 10 mph 33 / 26°F 80% 1021 mb
Low level cloud: 78%
Mid level cloud: 55%
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

E
E

 9 / 12 mph 34 / 27°F 84% 1019 mb
Low level cloud: 85%
Mid level cloud: 100%
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

ESE
ESE

 10 / 14 mph 34 / 26°F 96% 1018 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 13 / 18 mph 33 / 24°F 98% 1016 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Sun 15
Mar		00:00

ENE
ENE

 14 / 22 mph 33 / 23°F 99% 1013 mb
Low level cloud: 100%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
03:00

ENE
ENE

 15 / 22 mph 33 / 23°F 98% 1009 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

ENE
ENE

 15 / 22 mph 33 / 22°F 98% 1007 mb
Low level cloud: 100%
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
09:00

NE
NE

 20 / 28 mph 31 / 19°F 94% 1007 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
12:00

NNE
NNE

 19 / 26 mph 31 / 19°F 96% 1007 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

NNE
NNE

 23 / 32 mph 30 / 16°F 95% 1007 mb
Low level cloud: 82%
Mid level cloud: 90%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
18:00

N
N

 24 / 34 mph 28 / 13°F 92% 1013 mb
Low level cloud: 86%
Mid level cloud: 72%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

 17 / 25 mph 24 / 11°F 89% 1018 mb
Low level cloud: 89%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Mon 16
Mar		00:00

NNW
NNW

 14 / 20 mph 19 / 5°F 85% 1021 mb
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 11 / 15 mph 15 / 2°F 89% 1023 mb
Low level cloud: 58%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 9 / 10 mph 13 / 1°F 87% 1025 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
09:00

NW
NW

 9 / 11 mph 15 / 3°F 83% 1026 mb
Low level cloud: 16%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 12 / 14 mph 21 / 9°F 76% 1025 mb
Low level cloud: 100%
Mid level cloud: 58%
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

WNW
WNW

 11 / 13 mph 23 / 11°F 80% 1025 mb
Low level cloud: 84%
Mid level cloud: 100%
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

WNW
WNW

 7 / 11 mph 20 / 11°F 85% 1026 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 4 / 7 mph 15 / 9°F 96% 1027 mb
Low level cloud: 50%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 17
Mar		00:00

NE
NE

 7 / 13 mph 29 / 22°F 70% 1025 mb
Low level cloud: 39%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
69%
0.0 In
06:00

NNW
NNW

 9 / 18 mph 22 / 12°F 69% 1031 mb
Low level cloud: 25%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
12:00

WNW
WNW

 8 / 17 mph 24 / 15°F 39% 1028 mb
Low level cloud: 24%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NW
NW

 4 / 8 mph 31 / 27°F 37% 1031 mb
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 40%
Most Significant Cloud Type: low
29%
0.0 In
Wed 18
Mar		00:00

SSE
SSE

 5 / 11 mph 27 / 20°F 79% 1032 mb
Low level cloud: 21%
Mid level cloud: 43%
High level cloud: 41%
Most Significant Cloud Type: low
40%
0.0 In
06:00

SSE
SSE

 9 / 18 mph 27 / 19°F 91% 1022 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 42%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSE
SSE

 4 / 9 mph 32 / 28°F 93% 1024 mb
Low level cloud: 100%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 8 / 16 mph 33 / 26°F 88% 1023 mb
Low level cloud: 99%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Thu 19
Mar		00:00

NNE
NNE

 3 / 7 mph 32 / 29°F 96% 1022 mb
Low level cloud: 84%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

 3 / 7 mph 25 / 20°F 95% 1030 mb
Low level cloud: 49%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
12:00

E
E

 5 / 11 mph 34 / 29°F 100% 1024 mb
Low level cloud: 75%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 3 / 7 mph 36 / 33°F 95% 1028 mb
Low level cloud: 16%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
29%
0.0 In
Fri 20
Mar		00:00

ESE
ESE

 4 / 8 mph 36 / 33°F 100% 1024 mb
Low level cloud: 100%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

 9 / 18 mph 33 / 26°F 99% 1019 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSE
SSE

 2 / 4 mph 37 / 37°F 100% 1023 mb
Low level cloud: 85%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

 2 / 5 mph 39 / 38°F 100% 1016 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
Sat 21
Mar		00:00

ESE
ESE

 0 / 1 mph 37 / 37°F 100% 1021 mb
Low level cloud: 87%
Mid level cloud: 2%
High level cloud: 26%
Most Significant Cloud Type: low
91%
0.0 In
06:00

NW
NW

 3 / 5 mph 36 / 35°F 100% 1018 mb
Low level cloud: 89%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: low
91%
0.0 In
12:00

E
E

 3 / 7 mph 37 / 35°F 99% 1020 mb
Low level cloud: 90%
Mid level cloud: 7%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
18:00

N
N

 3 / 6 mph 42 / 41°F 97% 1020 mb
Low level cloud: 81%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
85%
0.0 In
Sun 22
Mar		00:00

ENE
ENE

 6 / 13 mph 38 / 33°F 99% 1015 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

 10 / 21 mph 38 / 31°F 87% 1026 mb
Low level cloud: 14%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
20%
0.0 In
12:00

NE
NE

 11 / 23 mph 39 / 32°F 97% 1011 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.1 In
18:00

ENE
ENE

 6 / 13 mph 49 / 47°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
0.0 In
Mon 23
Mar		00:00

NE
NE

 13 / 28 mph 34 / 25°F 89% 1017 mb
Low level cloud: 100%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

 9 / 19 mph 44 / 38°F 77% 1018 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

NE
NE

 13 / 27 mph 36 / 28°F 64% 1026 mb
Low level cloud: 98%
Mid level cloud: 20%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

 7 / 15 mph 76 / 79°F 65% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 24
Mar		00:00

E
E

 11 / 24 mph 33 / 24°F 60% 1030 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 33%
Most Significant Cloud Type: medium
56%
0.0 In
06:00

SW
SW

 10 / 20 mph 63 / 63°F 75% 1008 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

 10 / 21 mph 36 / 28°F 50% 1024 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

ENE
ENE

 6 / 12 mph 68 / 68°F 66% 1007 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 25
Mar		00:00

SSE
SSE

 8 / 16 mph 43 / 39°F 93% 1014 mb
Low level cloud: 70%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
06:00

ENE
ENE

 4 / 9 mph 53 / 52°F 91% 1010 mb
Low level cloud: 14%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
12:00

SW
SW

 16 / 34 mph 75 / 77°F 56% 1007 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
18:00

SSW
SSW

 11 / 23 mph 79 / 80°F 47% 1004 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
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