St. Helena, CA weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in St. Helena now
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St. Helena weather by the hour
St. Helena weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of St. Helena.
This week in St. Helena
Sunrise, sunset and moon in St. Helena
What is the weather usually like in St. Helena?
Köppen climate classification, calculated from the 1991–2020 normals
- Augustwarmest month · 89°F average high
- Decembercoldest month · 40°F average low
- 34.0 inprecipitation per year · 863 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit St. Helena: May–June and September–October, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station SAINT HELENA, CA US (USC00047643), adjusted for the elevation of St. Helena.
St. Helena weather month by month
Sunrise and sunset in St. Helena through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:24 AM | 5:14 PM | 9 h 50 min |
| February | 6:58 AM | 5:49 PM | 10 h 50 min |
| March | 7:19 AM | 7:18 PM | 11 h 59 min |
| April | 6:31 AM | 7:47 PM | 13 h 16 min |
| May | 5:56 AM | 8:16 PM | 14 h 19 min |
| June | 5:43 AM | 8:37 PM | 14 h 53 min |
| July | 5:56 AM | 8:35 PM | 14 h 38 min |
| August | 6:23 AM | 8:05 PM | 13 h 42 min |
| September | 6:50 AM | 7:19 PM | 12 h 28 min |
| October | 7:17 AM | 6:33 PM | 11 h 15 min |
| November | 6:50 AM | 4:58 PM | 10 h 7 min |
| December | 7:18 AM | 4:51 PM | 9 h 32 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in St. Helena?
St. Helena has a hot-summer mediterranean climate. The warmest month is August, with an average high of 89°F (32°C), and the coldest is December, with average lows of 40°F (4°C).
It gets about 34.0 inches (863 mm) of precipitation a year. The wettest month is December and the driest is July.
The best time to visit St. Helena is May–June and September–October. At 253 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about St. Helena
Weather in towns near St. Helena
Questions about the weather in St. Helena
What is the hottest month in St. Helena?
August, with an average high of 89°F (32°C).
What is the coldest month in St. Helena?
December, with an average low of 40°F (4°C).
How much does it rain in St. Helena?
About 34.0 inches (863 mm) a year; the wettest month is December.
Does it snow in St. Helena?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit St. Helena?
May–June and September–October, when temperatures are most pleasant and rainy days are fewer.
What climate does St. Helena have?
Hot-summer mediterranean (Köppen Csa).
What is the weather like in St. Helena in November?
Highs average 66°F and lows 44°F, with about 3.2 inches of precipitation.
What time is sunrise in St. Helena?
Around 6:50 AM in mid-November, and sunset around 4:58 PM. Today’s exact times are shown above.
Where does this St. Helena weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of St. Helena.
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