Weather in Napa in September 2018

  • 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

Going to Napa? Find the best month to visit Napa based on the weather.

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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 2018.

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More about Napa

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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 2018

Browse the sunrise & sunset times for Napa in September 2018. Select a month to view Napa sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st September 2018 06:39 19:39
Sunday, 2nd September 2018 06:40 19:37
Monday, 3rd September 2018 06:41 19:36
Tuesday, 4th September 2018 06:41 19:34
Wednesday, 5th September 2018 06:42 19:33
Thursday, 6th September 2018 06:43 19:31
Friday, 7th September 2018 06:44 19:30
Saturday, 8th September 2018 06:45 19:28
Sunday, 9th September 2018 06:46 19:26
Monday, 10th September 2018 06:47 19:25
Tuesday, 11th September 2018 06:47 19:23
Wednesday, 12th September 2018 06:48 19:22
Thursday, 13th September 2018 06:49 19:20
Friday, 14th September 2018 06:50 19:19
Saturday, 15th September 2018 06:51 19:17
Sunday, 16th September 2018 06:52 19:15
Monday, 17th September 2018 06:53 19:14
Tuesday, 18th September 2018 06:54 19:12
Wednesday, 19th September 2018 06:54 19:11
Thursday, 20th September 2018 06:55 19:09
Friday, 21st September 2018 06:56 19:07
Saturday, 22nd September 2018 06:57 19:06
Sunday, 23rd September 2018 06:58 19:04
Monday, 24th September 2018 06:59 19:03
Tuesday, 25th September 2018 07:00 19:01
Wednesday, 26th September 2018 07:01 19:00
Thursday, 27th September 2018 07:01 18:58
Friday, 28th September 2018 07:02 18:56
Saturday, 29th September 2018 07:03 18:55
Sunday, 30th September 2018 07:04 18:53
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