Napa weather

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The weather guide for Napa, California shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

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Which is the hottest month in Napa?

The hottest time of year in Napa is normally August. Expect maximum daytime temperatures to reach 28°C with moderate heat and humidity.

Which month has the most rain in Napa?

In terms of rainfall, January is usually the wettest month in Napa with 157mm on average. There are normally 10 days in January with some rain.

When is it sunniest in Napa?

The sunniest time of year in Napa is normally July with bright sunshine on average for 80% of daylight hours; that's 12 hours of sunshine per day.

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

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Compare Napa weather with the USA

Below the Napa weather chart shows average maximum daytime temperature for Napa, California, USA and the USA (Washington).

Maximum daytime temperature (°C)

Napa, California, USA
USA (Washington)
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Aug
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Dec

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

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Where's hot in California right now?

Below are the temperatures expected today at popular destinations in California. Select a destination to compare today's forecast with average weather conditions.

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