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 (80% of daylight hours) in September in Napa10
    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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Expect 27°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Napa in September. Check more long-term weather averages for Napa in September before you book your next holiday to California in 2019/2020.

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More about Napa

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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.

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
Monday, 2nd September 2019 06:39 19:38
Tuesday, 3rd September 2019 06:40 19:36
Wednesday, 4th September 2019 06:41 19:35
Thursday, 5th September 2019 06:42 19:33
Friday, 6th September 2019 06:43 19:31
Saturday, 7th September 2019 06:44 19:30
Sunday, 8th September 2019 06:45 19:28
Monday, 9th September 2019 06:46 19:27
Tuesday, 10th September 2019 06:46 19:25
Wednesday, 11th September 2019 06:47 19:24
Thursday, 12th September 2019 06:48 19:22
Friday, 13th September 2019 06:49 19:20
Saturday, 14th September 2019 06:50 19:19
Sunday, 15th September 2019 06:51 19:17
Monday, 16th September 2019 06:52 19:16
Tuesday, 17th September 2019 06:52 19:14
Wednesday, 18th September 2019 06:53 19:13
Thursday, 19th September 2019 06:54 19:11
Friday, 20th September 2019 06:55 19:09
Saturday, 21st September 2019 06:56 19:08
Sunday, 22nd September 2019 06:57 19:06
Monday, 23rd September 2019 06:58 19:05
Tuesday, 24th September 2019 06:59 19:03
Wednesday, 25th September 2019 06:59 19:02
Thursday, 26th September 2019 07:00 19:00
Friday, 27th September 2019 07:01 18:58
Saturday, 28th September 2019 07:02 18:57
Sunday, 29th September 2019 07:03 18:55
Monday, 30th September 2019 07:04 18:54
  • Book cheap flights to California with Thomas Cook Airlines
  • Prices start from £219.99 one-way based on return flights
  • Depart from airports across the UK

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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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