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Napa Valley United States of America
Temperatures in September
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Temperature in Napa Valley in September

Napa Valley is a region in the United States of America. September in has maximum daytime temperatures ranging from high in American Canyon with 28°C to very high temperatures in Calistoga with 31°C. Nighttime temperatures generally drop to 11°C in Calistoga and 11°C in American Canyon. September is a summer month. In Napa Valley, September typically stands out as the hottest month of the year. If you're planning a visit during this time, it would be wise to come prepared. Packing light and breathable summer cloths will ensure you stay comfortable throughout your stay.

What is the temperature of the different cities in Napa Valley in September?

Curious about the September temperatures in the prime spots of Napa Valley? Navigate the map below and tap on a destination dot for more detailed stats.

Weather conditions Weather
Temperatures
Precipitation
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Legend very warm warm pleasant moderate cold very cold
Very warm means maximum temperatures above 30°C. Warm: 22°C to 30°C. Pleasant: 18°C to 22°C Moderate: 12°C to 18°C. Cold: 2°C to 12°C. Very cold: lower than 2°C

  • What is the warmest city in September in Napa Valley?
    • Calistoga tops the warmest city list in our database with average maximum daytime temperatures around 31°C and a minimum nighttime temperature of around 11°C.

  • What is the coldest city in September in Napa Valley?
    • Our database indicates that in September, American Canyon is the city with the coolest temperatures in Napa Valley. You can expect daytime highs of 28°C and nighttime lows close to 11°C.

  • How much sun does Napa Valley get in September?
    • The city Napa usually sees around 275 hours of sunlight, indicating many sunny days.

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    • Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

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