Napa weather in December 2026

Expect daytime maximum temperatures of 55°F in Napa, California in December based on long-term weather averages. There are 5 hours of sunshine per day on average with 10 days with some rainfall and typically 5.0 inches of rainfall in the month.

  • 55°F maximum daytime temperature in December in Napa55
    55°F max day temperature
  • 5 hours of sunshine per day
  • 10 days with some rainfall in December in Napa10
    10 days with some rainfall
  • 37°F minimum night-time temperature in December in Napa37
    37°F min night temperature
  • 10 hours of daylight per day in December in Napa10
    10 hours of daylight per day
  • No heat & humidity in December in Napa0
    No heat & humidity
  • 5.0 inches monthly rainfall in December in Napa5.0
    5.0 inches of monthly rainfall
  • UV (maximum) index 2 (Low) in December in Napa2
    2 (Low) UV index

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Expires at 23:59 on Thursday 31st Dec 2026

The December weather guide for California (Napa) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Napa in December?

Daytime temperatures usually reach 68°F in Napa in December, falling to 46°F at night.

How sunny is it in Napa in December?

There are normally 7 hours of bright sunshine each day in Napa in December - that's 69% of daylight hours.

Does it rain in Napa in December?

There are usually 5 days with some rain in Napa in December and the average monthly rainfall is 2.1 inches.

Napa December sunrise & sunset times

Browse the sunrise and sunset times for Napa in December 2026. Select a month to view Napa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st December 2026 07:07 16:49
Wednesday, 16th December 2026 07:20 16:50
Thursday, 31st December 2026 07:26 16:59

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