Napa weather in May 2025

Expect 73°F daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Napa in May. Check more long-term weather averages for Napa in May before you book your next holiday to California in 2025/2026.

  • 73°F maximum daytime temperature in May in Napa73
    73°F max day temperature
  • 11 hours of sunshine per day
  • 3 days with some rainfall in May in Napa3
    3 days with some rainfall
  • 46°F minimum night-time temperature in May in Napa46
    46°F min night temperature
  • 14 hours of daylight per day in May in Napa14
    14 hours of daylight per day
  • No heat & humidity in May in Napa0
    No heat & humidity
  • 0.6 inches monthly rainfall in May in Napa0.6
    0.6 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in May in Napa8
    8 (Very High) UV index

More about Napa

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The May 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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More about California

How hot is it in Napa in May?

Daytime temperatures usually reach 73°F in Napa in May, falling to 46°F at night.

How sunny is it in Napa in May?

There are normally 11 hours of bright sunshine each day in Napa in May - that's 80% of daylight hours.

Does it ever rain in Napa in May?

There are usually 3 days with some rain in Napa in May and the average monthly rainfall is 0.6 inches.

Napa May sunrise & sunset times

Browse the sunrise and sunset times for Napa in May 2025. Select a month to view Napa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:12 19:01
Friday, 16th May 2025 04:57 19:15
Saturday, 31st May 2025 04:48 19:27

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