Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Songnam 14 Day Long Range Forecast

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

South Korea

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

Taking a look at Songnam over the coming two weeks and the average daytime maximum temperature will be around 34°C, with a high for the two weeks of 38°C expected on the afternoon of Tuesday 8th. The mean minimum temperature will be 25°C, dipping to its lowest on the morning of Saturday 5th at 23°C. Expect the next 14 days have most days seeing a little rain. The current forecast indicates Saturday 12th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 02
Jul		21:00

W
W

 2 / 3 mph 80 / 87°F 87% 1013 mb
Low level cloud: 37%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 03
Jul		00:00

WSW
WSW

 2 / 2 mph 77 / 83°F 93% 1012 mb
Low level cloud: 49%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 1 / 2 mph 76 / 81°F 95% 1012 mb
Low level cloud: 62%
Mid level cloud: 25%
High level cloud: 9%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 3 / 4 mph 77 / 79°F 95% 1012 mb
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 29%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 5 mph 87 / 88°F 70% 1012 mb
Low level cloud: 55%
Mid level cloud: 18%
High level cloud: 18%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 9 / 10 mph 91 / 94°F 51% 1011 mb
Low level cloud: 25%
Mid level cloud: 9%
High level cloud: 19%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 10 / 12 mph 91 / 95°F 50% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 8 / 9 mph 91 / 97°F 56% 1009 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
21:00

SW
SW

 3 / 4 mph 85 / 93°F 72% 1009 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 04
Jul		00:00

WSW
WSW

 2 / 3 mph 78 / 83°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 3 / 4 mph 76 / 80°F 85% 1009 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 3 / 5 mph 78 / 78°F 85% 1009 mb
Low level cloud: 29%
Mid level cloud: 74%
High level cloud: 15%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 3 / 4 mph 79 / 82°F 77% 1010 mb
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 81%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 3 / 4 mph 81 / 83°F 77% 1009 mb
Low level cloud: 49%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 6 / 7 mph 86 / 86°F 69% 1008 mb
Low level cloud: 5%
Mid level cloud: 56%
High level cloud: 7%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 7 / 8 mph 86 / 87°F 64% 1007 mb
Low level cloud: 13%
Mid level cloud: 32%
High level cloud: 5%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 3 / 4 mph 79 / 84°F 82% 1008 mb
Low level cloud: 13%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 05
Jul		00:00

SSW
SSW

 2 / 3 mph 76 / 80°F 88% 1008 mb
Low level cloud: 40%
Mid level cloud: 21%
High level cloud: 1%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 2 / 3 mph 74 / 79°F 93% 1007 mb
Low level cloud: 66%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 3 / 4 mph 74 / 78°F 93% 1007 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 5 mph 79 / 83°F 80% 1008 mb
Low level cloud: 97%
Mid level cloud: 22%
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

SW
SW

 6 / 6 mph 88 / 89°F 63% 1006 mb
Low level cloud: 36%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 9 / 10 mph 90 / 93°F 53% 1005 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 8 / 9 mph 89 / 95°F 61% 1004 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 3 / 4 mph 83 / 91°F 78% 1006 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 06
Jul		00:00

SSW
SSW

 2 / 3 mph 78 / 82°F 85% 1006 mb
Low level cloud: 10%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 2 / 2 mph 75 / 80°F 89% 1006 mb
Low level cloud: 20%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 2 / 3 mph 78 / 78°F 89% 1006 mb
Low level cloud: 20%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 3 / 3 mph 86 / 88°F 68% 1006 mb
Low level cloud: 37%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 5 / 6 mph 93 / 98°F 52% 1005 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 8 / 9 mph 96 / 101°F 45% 1003 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 8 / 9 mph 94 / 100°F 53% 1003 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 3 / 3 mph 86 / 93°F 66% 1004 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
Mon 07
Jul		00:00

W
W

 2 / 2 mph 81 / 86°F 72% 1005 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 1 / 1 mph 79 / 82°F 76% 1004 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
06:00

W
W

 2 / 3 mph 80 / 80°F 79% 1006 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 1 / 1 mph 89 / 92°F 57% 1005 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 4 / 4 mph 97 / 102°F 42% 1004 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 5 / 6 mph 101 / 107°F 37% 1002 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 7 / 8 mph 98 / 109°F 47% 1002 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 2 / 3 mph 90 / 102°F 64% 1003 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 08
Jul		00:00

SSE
SSE

 1 / 1 mph 84 / 92°F 79% 1004 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 2 / 3 mph 81 / 88°F 84% 1004 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 1 / 1 mph 83 / 86°F 87% 1005 mb
Low level cloud: 3%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 2 / 3 mph 90 / 97°F 66% 1005 mb
Low level cloud: 6%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 4 / 4 mph 98 / 108°F 48% 1003 mb
Low level cloud: 35%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 3 / 4 mph 101 / 108°F 38% 1002 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 5 / 6 mph 100 / 113°F 49% 1002 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 2 / 3 mph 89 / 99°F 61% 1003 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 09
Jul		03:00

ENE
ENE

 2 / 4 mph 90 / 115°F 85% 1003 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
09:00

E
E

 3 / 5 mph 95 / 115°F 63% 1004 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
15:00

E
E

 7 / 11 mph 105 / 115°F 33% 1004 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
21:00

ENE
ENE

 7 / 14 mph 90 / 97°F 53% 1006 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
Thu 10
Jul		03:00

ENE
ENE

 7 / 11 mph 79 / 82°F 62% 1005 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
09:00

ENE
ENE

 6 / 8 mph 91 / 100°F 53% 1004 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
15:00

ENE
ENE

 11 / 14 mph 102 / 108°F 32% 1000 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
21:00

E
E

 2 / 3 mph 91 / 101°F 58% 1003 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
Fri 11
Jul		03:00

ENE
ENE

 9 / 15 mph 82 / 86°F 70% 1003 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: medium
16%
0.0 In
09:00

ENE
ENE

 6 / 9 mph 89 / 95°F 53% 1004 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
15:00

ESE
ESE

 13 / 20 mph 91 / 99°F 52% 1001 mb
Low level cloud: 4%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
56%
0.0 In
21:00

E
E

 5 / 8 mph 93 / 108°F 60% 1001 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 24%
Most Significant Cloud Type: medium
12%
0.0 In
Sat 12
Jul		03:00

ESE
ESE

 10 / 16 mph 83 / 89°F 73% 1001 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 7%
Most Significant Cloud Type: medium
24%
0.0 In
09:00

ENE
ENE

 8 / 13 mph 86 / 92°F 63% 1000 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 76%
Most Significant Cloud Type: medium
33%
0.0 In
15:00

SW
SW

 15 / 28 mph 88 / 97°F 61% 1001 mb
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.1 In
21:00

ENE
ENE

 16 / 25 mph 80 / 84°F 69% 996 mb
Low level cloud: 2%
Mid level cloud: 89%
High level cloud: 21%
Most Significant Cloud Type: medium
94%
0.0 In
Sun 13
Jul		03:00

S
S

 1 / 2 mph 81 / 90°F 88% 1003 mb
Low level cloud: 44%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
09:00

ESE
ESE

 21 / 35 mph 85 / 91°F 65% 990 mb
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
83%
0.0 In
15:00

W
W

 9 / 18 mph 97 / 107°F 43% 1000 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
0.0 In
21:00

SSE
SSE

 13 / 25 mph 80 / 85°F 76% 991 mb
Low level cloud: 83%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Mon 14
Jul		03:00

WNW
WNW

 1 / 2 mph 88 / 104°F 80% 1001 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
09:00

WSW
WSW

 3 / 6 mph 79 / 84°F 87% 997 mb
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.1 In
15:00

W
W

 5 / 10 mph 103 / 115°F 38% 998 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
21:00

WNW
WNW

 3 / 6 mph 89 / 103°F 73% 998 mb
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
Tue 15
Jul		03:00

SW
SW

 1 / 3 mph 88 / 106°F 79% 999 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
09:00

ENE
ENE

 3 / 6 mph 86 / 93°F 65% 1002 mb
Low level cloud: 23%
Mid level cloud: 13%
High level cloud: 90%
Most Significant Cloud Type: low
38%
0.0 In
15:00

W
W

 10 / 19 mph 101 / 109°F 35% 998 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
21:00

N
N

 2 / 4 mph 87 / 95°F 65% 1002 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: medium
57%
0.0 In
Wed 16
Jul		03:00

E
E

 1 / 2 mph 87 / 100°F 73% 1001 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
0.0 In
09:00

ENE
ENE

 5 / 10 mph 82 / 85°F 62% 1005 mb
Low level cloud: 47%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
15:00

NW
NW

 4 / 9 mph 107 / 113°F 26% 1000 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
21:00

ENE
ENE

 3 / 6 mph 91 / 104°F 66% 1003 mb
Low level cloud: 10%
Mid level cloud: 21%
High level cloud: 17%
Most Significant Cloud Type: low
19%
0.0 In
Thu 17
Jul		03:00

ENE
ENE

 2 / 5 mph 89 / 100°F 64% 1001 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 7%
Most Significant Cloud Type: medium
16%
0.0 In
09:00

E
E

 4 / 8 mph 78 / 81°F 70% 1005 mb
Low level cloud: 61%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: low
77%
0.0 In
15:00

NE
NE

 4 / 7 mph 108 / 125°F 36% 999 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 42%
Most Significant Cloud Type: medium
23%
0.0 In
21:00

W
W

 3 / 7 mph 85 / 92°F 65% 1004 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In

Other Locations Near to Songnam

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