WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Springfield 14 Day Long Range Forecast

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

Virgin Islands, United States Of America

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

The forecast for Springfield in the coming two weeks is predicting the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 26°C expected on the afternoon of Thursday 12th. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 14th at 6°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Tuesday 10th 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 08
Jun
01:00

NW
NW

4 / 7 mph 54 / 54°F 96% 1010 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
04:00

NW
NW

3 / 6 mph 50 / 50°F 96% 1010 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
07:00

N
N

3 / 4 mph 65 / 62°F 86% 1012 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

4 / 5 mph 77 / 77°F 50% 1012 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

3 / 3 mph 83 / 79°F 39% 1011 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 16%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

9 / 10 mph 76 / 76°F 54% 1011 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 38%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

7 / 11 mph 67 / 64°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

2 / 5 mph 56 / 57°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 93%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 09
Jun
19:00

ESE
ESE

7 / 9 mph 64 / 64°F 77% 1014 mb
Low level cloud: 97%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

3 / 4 mph 58 / 59°F 96% 1015 mb
Low level cloud: 100%
Mid level cloud: 69%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 10
Jun
01:00

E
E

2 / 2 mph 57 / 58°F 97% 1014 mb
Low level cloud: 99%
Mid level cloud: 50%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

2 / 3 mph 55 / 56°F 99% 1013 mb
Low level cloud: 99%
Mid level cloud: 86%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

2 / 2 mph 55 / 56°F 99% 1014 mb
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

2 / 2 mph 57 / 58°F 99% 1013 mb
Low level cloud: 99%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

3 / 4 mph 57 / 57°F 100% 1011 mb
Low level cloud: 96%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
16:00

SSE
SSE

2 / 2 mph 62 / 62°F 97% 1010 mb
Low level cloud: 96%
Mid level cloud: 52%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

3 / 3 mph 61 / 61°F 99% 1011 mb
Low level cloud: 94%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

3 / 6 mph 57 / 57°F 99% 1013 mb
Low level cloud: 50%
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
Wed 11
Jun
01:00

WSW
WSW

4 / 8 mph 54 / 54°F 96% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

4 / 8 mph 50 / 49°F 96% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

4 / 5 mph 65 / 62°F 87% 1016 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

10 / 12 mph 76 / 77°F 50% 1015 mb
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

13 / 15 mph 79 / 78°F 45% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

12 / 14 mph 79 / 78°F 50% 1014 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

10 / 18 mph 68 / 66°F 67% 1014 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
22:00

WSW
WSW

10 / 19 mph 64 / 64°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 12
Jun
01:00

W
W

12 / 17 mph 66 / 66°F 72% 1013 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 39%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

9 / 13 mph 64 / 64°F 79% 1014 mb
Low level cloud: 4%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

8 / 9 mph 69 / 68°F 59% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 90%
Most Significant Cloud Type: high
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

12 / 14 mph 76 / 76°F 42% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 13%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

10 / 11 mph 79 / 78°F 38% 1014 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

10 / 11 mph 79 / 78°F 46% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

8 / 16 mph 68 / 65°F 68% 1015 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

5 / 10 mph 60 / 60°F 72% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 13
Jun
01:00

NNW
NNW

3 / 5 mph 57 / 58°F 83% 1018 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 12%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

4 / 8 mph 49 / 48°F 95% 1020 mb
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

5 / 6 mph 59 / 57°F 69% 1022 mb
Low level cloud: 11%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

7 / 8 mph 68 / 66°F 43% 1022 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

8 / 9 mph 73 / 69°F 30% 1022 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 84%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

6 / 7 mph 72 / 69°F 30% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 7%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

5 / 10 mph 58 / 56°F 64% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

4 / 9 mph 47 / 46°F 69% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 14
Jun
01:00

NNW
NNW

3 / 6 mph 45 / 44°F 72% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

3 / 6 mph 43 / 42°F 78% 1029 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
07:00

NNE
NNE

2 / 3 mph 58 / 57°F 59% 1029 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

5 / 6 mph 70 / 67°F 39% 1028 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 55%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

6 / 7 mph 75 / 75°F 36% 1026 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

5 / 6 mph 75 / 75°F 41% 1025 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

6 / 11 mph 63 / 60°F 58% 1026 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

3 / 6 mph 54 / 55°F 61% 1026 mb
Low level cloud: 0%
Mid level cloud: 72%
High level cloud: 12%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 15
Jun
01:00

S
S

2 / 5 mph 60 / 60°F 100% 1010 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

4 / 7 mph 63 / 63°F 83% 1023 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 92%
Most Significant Cloud Type: medium
16%
0.0 In
13:00

E
E

3 / 5 mph 80 / 80°F 36% 1023 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

S
S

4 / 7 mph 64 / 64°F 80% 1021 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 7%
Most Significant Cloud Type: medium
24%
0.0 In
Mon 16
Jun
01:00

S
S

4 / 8 mph 56 / 56°F 80% 1025 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
07:00

S
S

3 / 5 mph 62 / 62°F 52% 1027 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

S
S

5 / 9 mph 67 / 67°F 58% 1020 mb
Low level cloud: 57%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
72%
0.0 In
19:00

ESE
ESE

3 / 4 mph 68 / 68°F 86% 1017 mb
Low level cloud: 67%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
82%
0.0 In
Tue 17
Jun
01:00

SE
SE

2 / 4 mph 55 / 56°F 98% 1018 mb
Low level cloud: 35%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SSE
SSE

3 / 5 mph 61 / 61°F 96% 1018 mb
Low level cloud: 98%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

S
S

10 / 13 mph 70 / 70°F 72% 1018 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

S
S

9 / 12 mph 69 / 69°F 79% 1012 mb
Low level cloud: 63%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
79%
0.0 In
Wed 18
Jun
01:00

SSE
SSE

5 / 6 mph 62 / 62°F 83% 1017 mb
Low level cloud: 27%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
07:00

SSW
SSW

4 / 7 mph 67 / 67°F 99% 1008 mb
Low level cloud: 90%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
13:00

S
S

13 / 17 mph 77 / 80°F 60% 1010 mb
Low level cloud: 88%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: low
95%
0.0 In
19:00

W
W

8 / 16 mph 68 / 68°F 58% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 19
Jun
01:00

SSW
SSW

3 / 5 mph 66 / 66°F 100% 1004 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.2 In
07:00

SW
SW

3 / 5 mph 72 / 76°F 67% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

W
W

11 / 19 mph 81 / 81°F 41% 1005 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

SW
SW

8 / 17 mph 77 / 80°F 72% 1003 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 15%
Most Significant Cloud Type: medium
28%
0.0 In
Fri 20
Jun
01:00

WNW
WNW

3 / 6 mph 59 / 60°F 96% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

WNW
WNW

10 / 21 mph 72 / 76°F 68% 1004 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
6%
0.6 In
13:00

W
W

7 / 12 mph 83 / 82°F 35% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 53%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

SW
SW

3 / 7 mph 70 / 70°F 75% 1006 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 17%
Most Significant Cloud Type: medium
9%
0.0 In
Sat 21
Jun
01:00

WNW
WNW

2 / 4 mph 60 / 60°F 96% 1012 mb
Low level cloud: 19%
Mid level cloud: 89%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

NNW
NNW

1 / 3 mph 68 / 68°F 79% 1006 mb
Low level cloud: 0%
Mid level cloud: 86%
High level cloud: 15%
Most Significant Cloud Type: medium
87%
0.0 In
13:00

N
N

4 / 7 mph 80 / 81°F 53% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.0 In
19:00

W
W

3 / 7 mph 67 / 67°F 81% 1005 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 11%
Most Significant Cloud Type: medium
20%
0.1 In
Sun 22
Jun
01:00

NNW
NNW

2 / 4 mph 61 / 61°F 96% 1014 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

NNW
NNW

1 / 3 mph 67 / 67°F 67% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SSE
SSE

5 / 10 mph 78 / 81°F 69% 1013 mb
Low level cloud: 47%
Mid level cloud: 14%
High level cloud: 4%
Most Significant Cloud Type: low
52%
0.1 In
19:00

WSW
WSW

3 / 5 mph 67 / 67°F 65% 1007 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Mon 23
Jun
01:00

ESE
ESE

3 / 7 mph 62 / 62°F 99% 1013 mb
Low level cloud: 39%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
65%
0.4 In
07:00

ESE
ESE

4 / 9 mph 63 / 63°F 93% 1010 mb
Low level cloud: 73%
Mid level cloud: 29%
High level cloud: 15%
Most Significant Cloud Type: low
85%
0.0 In
13:00

E
E

4 / 9 mph 64 / 64°F 99% 1012 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.5 In
19:00

ESE
ESE

10 / 21 mph 60 / 60°F 99% 1007 mb
Low level cloud: 99%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.9 In

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

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.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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.
(More Info)

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.
(More Info)

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.
(More Info)

Pressure