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St. Helena
Average sun percentage
Climate ▸Forecast ▸December ▸January ▸
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Average percent of sunshine in St. Helena (CA)

The mean percent of sunhours during the day in St. Helena (California), the United States of America.


  • The sun shines on average 79.0% in April making it the most sunny month.
  • On average, December has the lowest percentage of sunshine with 55.0%.

Forecast: is it sunny in St. Helena (CA)?

Sat   Dec 21
13°C | 7°C
E 1 m/s
2.3 mm
broken clouds and rain

broken clouds and rain

hourly forecast
Sun   Dec 22
15°C | 9°C
S 3 m/s
8.1 mm
overcast and slight rain

overcast and slight rain

hourly forecast
Mon   Dec 23
15°C | 10°C
SE 3 m/s
6.7 mm
overcast and rain

overcast and rain

hourly forecast
5-Day Forecast 10-Day Forecast

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