Napa weather in September 2019

  • 27°C maximum daytime temperature in September in Napa27
    27°C max day temperature
  • 10 hours of sunshine per day
  • 2 days with some rainfall in September in Napa2
    2 days with some rainfall
  • 11°C minimum night-time temperature in September in Napa11
    11°C min night temperature
  • 12 hours of daylight per day in September in Napa12
    12 hours of daylight per day
  • Moderate heat & humidity in September in NapaM
    Moderate heat & humidity
  • 10 mm monthly rainfall in September in Napa10
    10 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Napa7
    7 (High) UV index
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The September weather guide for Napa, California 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.

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Metric (°C / mm)  |  Imperial (°F / inches)

Guide to Napa weather in September

The average maximum daytime temperature in Napa in September is a warm 27°C (81°F) with moderate heat & humidity. The average night-time temperature is usually a cool 11°C (52°F). There are usually 10 hours of bright sunshine each day, which represents 80% of the 12 hours of daylight.

Expect 10mm (0.4 inches) of rainfall across the whole of September with 2 days with some rain falling. Maximum UV levels will be high (7 UV index) at midday when the skies are clear.

Napa sunrise & sunset times for September 2019

Browse the sunrise & sunset times for Napa in September 2019. Select a month to view Napa sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2019 06:39 19:39
Sunday, 15th September 2019 06:51 19:17
Monday, 30th September 2019 07:04 18:54
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Popular California destinations

Below are average maximum temperatures at popular destinations in California in September. Select a destination to see more weather parameters.

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