Napa weather in January 2026

Expect daytime maximum temperatures of 13°C in Napa, California in January based on long-term weather averages. There are 6 hours of sunshine per day on average with 10 days with some rainfall and typically 157 mm of rainfall in the month.

  • 13°C maximum daytime temperature in January in Napa13
    13°C max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in January in Napa10
    10 days with some rainfall
  • 3°C minimum night-time temperature in January in Napa3
    3°C min night temperature
  • 10 hours of daylight per day in January in Napa10
    10 hours of daylight per day
  • No heat & humidity in January in Napa0
    No heat & humidity
  • 157 mm monthly rainfall in January in Napa157
    157 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in January in Napa2
    2 (Low) UV index

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The January 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 / mm)  |  Imperial (°F / inches)

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More about California

How warm is it in Napa in January?

Daytime temperatures usually reach 13°C in Napa in January, falling to 3°C at night.

How sunny is it in Napa in January?

There are normally 6 hours of bright sunshine each day in Napa in January - that's 57% of daylight hours.

Does it rain in Napa in January?

There are usually 10 days with some rain in Napa in January and the average monthly rainfall is 157mm.

Napa January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:26 17:00
Friday, 16th January 2026 07:24 17:14
Saturday, 31st January 2026 07:15 17:31

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