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New Athens 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for New Athens

Illinois, United States Of America

Long range weather outlook for New Athens includes 14 day forecast summary:

Reviewing the forecast for New Athens Over the next 14 days and the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 30°C expected on the afternoon of Wednesday 22nd. The average minimum temperature will be 17°C, dipping to its lowest on the morning of Monday 20th at 13°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. It looks like Friday 17th will have the most precipitation with an accumulation of around 38.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May
12:00

NW
NW

2 / 3 mph 69 / 66°F 88% 1004 mb
Low level cloud: 55%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

3 / 5 mph 74 / 76°F 75% 1003 mb
Low level cloud: 68%
Mid level cloud: 22%
High level cloud: 22%
Most Significant Cloud Type: low
77%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

N
N

8 / 17 mph 69 / 66°F 88% 1003 mb
Low level cloud: 15%
Mid level cloud: 32%
High level cloud: 93%
Most Significant Cloud Type: low
37%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
21:00

N
N

6 / 11 mph 62 / 62°F 96% 1005 mb
Low level cloud: 23%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 15
May
00:00

NNW
NNW

7 / 12 mph 61 / 60°F 97% 1005 mb
Low level cloud: 78%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

10 / 15 mph 59 / 57°F 98% 1007 mb
Low level cloud: 94%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

9 / 12 mph 59 / 56°F 96% 1008 mb
Low level cloud: 71%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

12 / 14 mph 64 / 64°F 83% 1010 mb
Low level cloud: 100%
Mid level cloud: 18%
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

N
N

9 / 10 mph 72 / 69°F 74% 1010 mb
Low level cloud: 64%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

8 / 10 mph 75 / 76°F 68% 1009 mb
Low level cloud: 50%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

4 / 6 mph 74 / 76°F 78% 1010 mb
Low level cloud: 10%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

5 / 11 mph 66 / 66°F 78% 1011 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May
00:00

ESE
ESE

6 / 12 mph 62 / 62°F 93% 1011 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

6 / 12 mph 60 / 60°F 93% 1010 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 10%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

6 / 11 mph 61 / 60°F 93% 1011 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

8 / 10 mph 67 / 64°F 90% 1011 mb
Low level cloud: 25%
Mid level cloud: 50%
High level cloud: 99%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

11 / 17 mph 67 / 65°F 95% 1010 mb
Low level cloud: 42%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
60%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
15:00

WSW
WSW

10 / 13 mph 75 / 77°F 80% 1008 mb
Low level cloud: 55%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

4 / 5 mph 77 / 77°F 83% 1008 mb
Low level cloud: 4%
Mid level cloud: 18%
High level cloud: 12%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

5 / 9 mph 65 / 65°F 96% 1009 mb
Low level cloud: 20%
Mid level cloud: 30%
High level cloud: 53%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May
00:00

ESE
ESE

6 / 11 mph 64 / 64°F 97% 1009 mb
Low level cloud: 47%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: low
54%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SW
SW

5 / 10 mph 63 / 63°F 97% 1007 mb
Low level cloud: 25%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SE
SE

6 / 12 mph 67 / 64°F 97% 1008 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 92%
Most Significant Cloud Type: low
50%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

E
E

6 / 9 mph 64 / 64°F 99% 1008 mb
Low level cloud: 90%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

SSE
SSE

13 / 19 mph 65 / 65°F 94% 1007 mb
Low level cloud: 79%
Mid level cloud: 64%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
15:00

SSE
SSE

12 / 18 mph 68 / 68°F 91% 1005 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SE
SE

13 / 24 mph 68 / 68°F 93% 1003 mb
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

SE
SE

11 / 20 mph 66 / 65°F 98% 1002 mb
Low level cloud: 80%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
Sat 18
May
00:00

SSE
SSE

10 / 17 mph 65 / 65°F 97% 1001 mb
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

SSE
SSE

9 / 14 mph 64 / 64°F 98% 1000 mb
Low level cloud: 76%
Mid level cloud: 85%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

10 / 15 mph 63 / 63°F 96% 1001 mb
Low level cloud: 95%
Mid level cloud: 64%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

11 / 13 mph 65 / 65°F 96% 1002 mb
Low level cloud: 95%
Mid level cloud: 74%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

10 / 12 mph 67 / 67°F 97% 1002 mb
Low level cloud: 99%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WNW
WNW

15 / 21 mph 68 / 68°F 94% 1003 mb
Low level cloud: 92%
Mid level cloud: 43%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NW
NW

15 / 18 mph 67 / 67°F 92% 1005 mb
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

13 / 15 mph 66 / 66°F 95% 1007 mb
Low level cloud: 96%
Mid level cloud: 20%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NW
NW

12 / 17 mph 64 / 64°F 95% 1008 mb
Low level cloud: 97%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

12 / 20 mph 62 / 62°F 96% 1010 mb
Low level cloud: 60%
Mid level cloud: 9%
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

10 / 15 mph 64 / 62°F 95% 1011 mb
Low level cloud: 57%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

13 / 15 mph 73 / 76°F 78% 1012 mb
Low level cloud: 67%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

14 / 16 mph 78 / 78°F 65% 1012 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

13 / 16 mph 77 / 78°F 62% 1012 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

10 / 16 mph 71 / 69°F 76% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

7 / 15 mph 61 / 61°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNW
NNW

7 / 14 mph 59 / 58°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 12 mph 56 / 55°F 92% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

5 / 8 mph 59 / 58°F 91% 1014 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

4 / 4 mph 72 / 69°F 74% 1014 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

2 / 2 mph 79 / 79°F 58% 1013 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
15:00

N
N

2 / 2 mph 81 / 79°F 51% 1012 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

3 / 4 mph 81 / 80°F 66% 1011 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

E
E

5 / 10 mph 68 / 68°F 75% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May
00:00

E
E

13 / 26 mph 59 / 60°F 70% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NNW
NNW

10 / 21 mph 48 / 44°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

S
S

14 / 29 mph 79 / 83°F 83% 1005 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
0.0 In
Wed 22
May
00:00

SSE
SSE

12 / 24 mph 69 / 69°F 97% 1003 mb
Low level cloud: 61%
Mid level cloud: 67%
High level cloud: 6%
Most Significant Cloud Type: low
85%
0.0 In
06:00

NNE
NNE

5 / 10 mph 70 / 70°F 95% 1009 mb
Low level cloud: 37%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.0 In
12:00

S
S

11 / 23 mph 89 / 95°F 54% 1005 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

5 / 11 mph 84 / 91°F 71% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 23
May
00:00

SSW
SSW

9 / 19 mph 70 / 70°F 94% 1003 mb
Low level cloud: 26%
Mid level cloud: 27%
High level cloud: 16%
Most Significant Cloud Type: low
37%
2.1 In
06:00

W
W

8 / 16 mph 66 / 66°F 96% 1013 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
51%
0.3 In
12:00

NW
NW

8 / 17 mph 75 / 78°F 67% 1007 mb
Low level cloud: 37%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: low
39%
0.0 In
18:00

S
S

12 / 26 mph 77 / 81°F 81% 1007 mb
Low level cloud: 27%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: low
44%
0.2 In
Fri 24
May
00:00

NE
NE

7 / 15 mph 62 / 62°F 95% 1007 mb
Low level cloud: 29%
Mid level cloud: 20%
High level cloud: 12%
Most Significant Cloud Type: low
37%
0.1 In
06:00

SSW
SSW

11 / 24 mph 66 / 65°F 93% 1006 mb
Low level cloud: 29%
Mid level cloud: 16%
High level cloud: 12%
Most Significant Cloud Type: low
36%
0.3 In
12:00

NNE
NNE

11 / 23 mph 62 / 62°F 86% 1010 mb
Low level cloud: 100%
Mid level cloud: 19%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WSW
WSW

6 / 12 mph 79 / 84°F 81% 1007 mb
Low level cloud: 28%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.1 In
Sat 25
May
00:00

N
N

9 / 18 mph 57 / 55°F 91% 1013 mb
Low level cloud: 94%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
06:00

ESE
ESE

4 / 9 mph 71 / 71°F 93% 1009 mb
Low level cloud: 36%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
12:00

N
N

12 / 25 mph 68 / 68°F 62% 1017 mb
Low level cloud: 60%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: low
62%
0.0 In
18:00

SSW
SSW

4 / 9 mph 77 / 82°F 85% 1007 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 67%
Most Significant Cloud Type: medium
58%
0.2 In
Sun 26
May
00:00

NW
NW

2 / 5 mph 59 / 60°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

N
N

10 / 20 mph 63 / 63°F 93% 1013 mb
Low level cloud: 86%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
12:00

SSW
SSW

4 / 8 mph 74 / 77°F 60% 1018 mb
Low level cloud: 6%
Mid level cloud: 24%
High level cloud: 33%
Most Significant Cloud Type: medium
41%
0.0 In
18:00

NNE
NNE

8 / 18 mph 70 / 70°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 27
May
00:00

SSE
SSE

5 / 10 mph 62 / 62°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 33%
Most Significant Cloud Type: medium
54%
0.0 In
06:00

ENE
ENE

7 / 15 mph 59 / 59°F 89% 1017 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
12:00

SE
SE

11 / 23 mph 64 / 64°F 89% 1016 mb
Low level cloud: 14%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: medium
84%
0.0 In
18:00

E
E

9 / 19 mph 73 / 77°F 76% 1013 mb
Low level cloud: 7%
Mid level cloud: 8%
High level cloud: 13%
Most Significant Cloud Type: low
11%
0.0 In
Tue 28
May
00:00

SSE
SSE

13 / 27 mph 65 / 65°F 90% 1011 mb
Low level cloud: 88%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

22 / 46 mph 68 / 68°F 94% 1009 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 88%
Most Significant Cloud Type: low
98%
0.7 In
12:00

SSW
SSW

14 / 30 mph 75 / 79°F 86% 1006 mb
Low level cloud: 89%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.4 In
18:00

WNW
WNW

17 / 37 mph 68 / 68°F 82% 1008 mb
Low level cloud: 37%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.1 In
Wed 29
May
00:00

WNW
WNW

12 / 25 mph 70 / 70°F 92% 1010 mb
Low level cloud: 18%
Mid level cloud: 27%
High level cloud: 5%
Most Significant Cloud Type: low
27%
0.3 In
06:00

WNW
WNW

16 / 34 mph 57 / 53°F 83% 1012 mb
Low level cloud: 18%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
12:00

W
W

13 / 27 mph 76 / 78°F 52% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

12 / 26 mph 67 / 67°F 74% 1013 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
20%
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