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St. Helena Weather Forecast

Temperature, wind, rain and more for St. Helena

California, United States Of America

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 03
Nov		01:00

W
W

 1 / 2 mph 54 / 54°F 79% 1016 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
04:00

WSW
WSW

 2 / 5 mph 54 / 55°F 91% 1016 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
07:00

WSW
WSW

 2 / 5 mph 49 / 49°F 94% 1016 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
10:00

SW
SW

 4 / 5 mph 71 / 69°F 44% 1017 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
13:00

WSW
WSW

 8 / 9 mph 76 / 74°F 24% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 6 / 7 mph 70 / 69°F 49% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 4 / 9 mph 53 / 52°F 75% 1017 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

W
W

 4 / 9 mph 50 / 49°F 84% 1018 mb
Low level cloud: 24%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 04
Nov		13:00

S
S

 7 / 8 mph 72 / 76°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 89%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 7 / 9 mph 69 / 68°F 59% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 5 / 10 mph 52 / 50°F 94% 1015 mb
Low level cloud: 82%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 7 / 8 mph 59 / 59°F 88% 1014 mb
Low level cloud: 93%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
The 7 day weather forecast summary for St. Helena:

The outlook for St. Helena in the week ahead shows the average daytime maximum temperature will be around 23°C, with a high for the week of 27°C expected on the afternoon of Monday 10th. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Thursday 6th at 9°C. The week ahead will have mostly dry days although Wednesday is likely to see a significant amount of rain. The current forecast indicates Wednesday 6th will have the most precipitation with an accumulation of around 25.0mm. On the whole winds are likely to be light.

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