Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Colfax 14 Day Long Range Forecast

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

California, United States Of America

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

Over the next 14 days the Colfax forecast suggests the average daytime maximum temperature will be around 28°C, with a high for the two weeks of 31°C expected on the afternoon of Friday 31st. The average minimum temperature will be 14°C, dipping to its lowest on the morning of Sunday 26th at 8°C. The next 14 days will remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Sun 26
May		04:00

ENE
ENE

 5 / 10 mph 49 / 47°F 59%
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
07:00

WNW
WNW

 2 / 2 mph 62 / 59°F 41%
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
10:00

WSW
WSW

 7 / 8 mph 71 / 68°F 38%
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
13:00

WSW
WSW

 8 / 9 mph 76 / 75°F 34%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 6 / 7 mph 77 / 75°F 34%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 1 / 1 mph 70 / 67°F 63%
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
22:00

ENE
ENE

 5 / 11 mph 59 / 58°F 70%
Low level cloud: 0%
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
Mon 27
May		01:00

ENE
ENE

 5 / 11 mph 56 / 55°F 68%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 5 / 11 mph 55 / 54°F 65%
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
07:00

S
S

 1 / 1 mph 67 / 65°F 49%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 7 / 8 mph 76 / 76°F 38%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 8 / 9 mph 80 / 77°F 31%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 6 / 7 mph 80 / 76°F 25%
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
19:00

SE
SE

 2 / 4 mph 73 / 70°F 48%
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
22:00

ENE
ENE

 6 / 13 mph 59 / 59°F 54%
Low level cloud: 0%
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
Tue 28
May		01:00

ENE
ENE

 6 / 13 mph 57 / 56°F 56%
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
04:00

E
E

 5 / 11 mph 56 / 55°F 56%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 1 / 2 mph 68 / 65°F 42%
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
10:00

SW
SW

 7 / 8 mph 76 / 75°F 30%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 9 / 10 mph 80 / 76°F 26%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 7 / 8 mph 80 / 76°F 27%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 19%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 7 mph 69 / 67°F 54%
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
22:00

E
E

 6 / 12 mph 59 / 58°F 63%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May		01:00

E
E

 5 / 11 mph 56 / 55°F 62%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 4 / 9 mph 55 / 55°F 61%
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
07:00

WSW
WSW

 2 / 2 mph 65 / 62°F 45%
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
10:00

WSW
WSW

 7 / 8 mph 74 / 74°F 34%
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
13:00

WSW
WSW

 8 / 9 mph 78 / 76°F 30%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 6 / 8 mph 79 / 76°F 29%
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
19:00

SSE
SSE

 1 / 2 mph 68 / 66°F 54%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 6 / 13 mph 59 / 60°F 59%
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 30
May		01:00

NE
NE

 6 / 13 mph 57 / 56°F 54%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 6 / 13 mph 55 / 54°F 46%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 1 / 2 mph 68 / 65°F 35%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 8 / 9 mph 79 / 75°F 25%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 9 / 10 mph 82 / 78°F 23%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 8 / 9 mph 84 / 78°F 20%
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
19:00

NNE
NNE

 2 / 5 mph 76 / 75°F 36%
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
22:00

ENE
ENE

 7 / 15 mph 62 / 62°F 38%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May		01:00

ENE
ENE

 7 / 15 mph 60 / 60°F 36%
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
04:00

ENE
ENE

 7 / 15 mph 58 / 56°F 30%
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
07:00

ENE
ENE

 4 / 6 mph 71 / 69°F 23%
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
10:00

WSW
WSW

 7 / 8 mph 85 / 78°F 15%
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
13:00

WSW
WSW

 9 / 10 mph 88 / 82°F 16%
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
16:00

WSW
WSW

 6 / 7 mph 88 / 82°F 15%
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
19:00

E
E

 3 / 6 mph 79 / 76°F 33%
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
22:00

ENE
ENE

 6 / 13 mph 65 / 65°F 36%
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
Sat 01
Jun		01:00

ENE
ENE

 6 / 14 mph 63 / 63°F 37%
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
04:00

ENE
ENE

 6 / 13 mph 62 / 62°F 37%
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
07:00

ESE
ESE

 2 / 3 mph 75 / 74°F 30%
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
10:00

SW
SW

 7 / 8 mph 84 / 78°F 20%
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
13:00

SW
SW

 9 / 10 mph 88 / 82°F 16%
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
16:00

SW
SW

 7 / 9 mph 87 / 81°F 16%
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
19:00

SE
SE

 4 / 7 mph 76 / 76°F 37%
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
22:00

ENE
ENE

 7 / 14 mph 63 / 63°F 40%
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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Sun 02
Jun		04:00

E
E

 5 / 11 mph 58 / 57°F 43%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 28%
Most Significant Cloud Type: high
27%
0.0 In
10:00

SW
SW

 7 / 8 mph 77 / 76°F 28%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
16:00

WSW
WSW

 6 / 7 mph 79 / 78°F 32%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
22:00

ENE
ENE

 5 / 11 mph 63 / 63°F 54%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: medium
13%
0.0 In
Mon 03
Jun		04:00

E
E

 4 / 9 mph 61 / 61°F 49%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

SSW
SSW

 9 / 10 mph 73 / 76°F 45%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
16:00

SSW
SSW

 9 / 11 mph 78 / 76°F 25%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
0.0 In
22:00

ESE
ESE

 5 / 9 mph 57 / 57°F 87%
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
Tue 04
Jun		04:00

E
E

 3 / 6 mph 56 / 56°F 67%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
9%
0.0 In
10:00

SW
SW

 8 / 9 mph 72 / 75°F 39%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: high
87%
0.0 In
16:00

SW
SW

 8 / 9 mph 78 / 77°F 33%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
0.0 In
22:00

E
E

 2 / 3 mph 61 / 61°F 90%
Low level cloud: 37%
Mid level cloud: 33%
High level cloud: 18%
Most Significant Cloud Type: low
50%
0.0 In
Wed 05
Jun		04:00

ENE
ENE

 4 / 9 mph 56 / 56°F 68%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 16%
Most Significant Cloud Type: medium
23%
0.0 In
10:00

WSW
WSW

 8 / 9 mph 71 / 71°F 54%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.0 In
16:00

W
W

 7 / 9 mph 81 / 79°F 26%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: medium
1%
0.0 In
22:00

E
E

 4 / 10 mph 57 / 56°F 60%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
0.0 In
Thu 06
Jun		04:00

ENE
ENE

 4 / 9 mph 60 / 60°F 56%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: high
6%
0.0 In
10:00

SSW
SSW

 8 / 10 mph 72 / 75°F 41%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: medium
3%
0.0 In
16:00

W
W

 6 / 7 mph 87 / 85°F 28%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: medium
1%
0.0 In
22:00

ESE
ESE

 5 / 10 mph 56 / 55°F 72%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
Fri 07
Jun		04:00

E
E

 4 / 7 mph 65 / 65°F 65%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
1%
0.0 In
10:00

S
S

 4 / 5 mph 58 / 58°F 81%
Low level cloud: 70%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
16:00

SW
SW

 5 / 6 mph 84 / 82°F 34%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: medium
25%
0.0 In
22:00

ENE
ENE

 5 / 11 mph 56 / 55°F 74%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Sat 08
Jun		04:00

E
E

 3 / 6 mph 63 / 63°F 73%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
10:00

W
W

 7 / 10 mph 77 / 76°F 24%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

SE
SE

 1 / 1 mph 80 / 81°F 52%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 10%
Most Significant Cloud Type: medium
2%
0.0 In
22:00

ENE
ENE

 7 / 15 mph 64 / 64°F 32%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 09
Jun		04:00

E
E

 4 / 8 mph 63 / 63°F 77%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
0.0 In
10:00

W
W

 6 / 8 mph 87 / 83°F 12%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

SW
SW

 8 / 10 mph 84 / 82°F 31%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
22:00

ENE
ENE

 8 / 16 mph 70 / 70°F 26%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 10
Jun		04:00

E
E

 4 / 9 mph 60 / 60°F 65%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
0.0 In
10:00

WSW
WSW

 5 / 6 mph 94 / 90°F 10%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

SW
SW

 9 / 10 mph 82 / 80°F 26%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
0.0 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