Napa weather in May 2026

Expect daytime maximum temperatures of 23°C in Napa, California in May based on long-term weather averages. There are 11 hours of sunshine per day on average.

  • 23°C maximum daytime temperature in May in Napa23
    23°C max day temperature
  • 11 hours of sunshine per day
  • 3 days with some rainfall in May in Napa3
    3 days with some rainfall
  • 8°C minimum night-time temperature in May in Napa8
    8°C 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
  • 14 mm monthly rainfall in May in Napa14
    14 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in May in Napa8
    8 (Very High) UV index

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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 / mm)  |  Imperial (°F / inches)

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More about California

How hot is it in Napa in May?

Daytime temperatures usually reach 23°C in Napa in May, falling to 13°C at night.

How sunny is it in Napa in May?

There are normally 9 hours of bright sunshine each day in Napa in May - that's 65% of daylight hours.

Does it ever rain in Napa in May?

There is usually 1 day with some rain in Napa in May and the average monthly rainfall is 5mm.

Napa May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:12 19:01
Saturday, 16th May 2026 04:57 19:15
Sunday, 31st May 2026 04:48 19:26

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