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Napa weather in September 2019
- 2727°C max day temperature
- 22 days with some rainfall
- 1111°C min night temperature
- 1212 hours of daylight per day
- MModerate heat & humidity
- 1010 mm of monthly rainfall
- 77 (High) UV index
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.
|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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