Temperature in The Napa Valley in August

Daytime highs, nighttime lows and the warmest cities in the Napa Valley, the United States of America this August.

The Napa Valley, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in August ranging from 27°C (81°F) in American Canyon to 32°C (90°F) in Calistoga. Nighttime temperatures generally drop to 12°C (54°F) in Calistoga and 12°C (54°F) in American Canyon. In August, it is summer.

What is the temperature of the different cities in the Napa Valley, the United States of America in August?

Explore the map below to discover average August temperatures at the top destinations in the Napa Valley. For a deeper dive, simply click on any destination dot.

Select a Month

Check the conditions for any month of the year.

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For a detailed overview over the year and the best time to visit the Napa Valley, check out our the Napa Valley's climate page.

See also: the Napa Valley weather by month.

Best Places to Visit in the Napa Valley in August

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the Napa Valley.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in August: blue is cold, red is hot.

See all August weather averages, cities and regions in the Napa Valley

The Napa Valley temperatures in August: frequently asked questions

How hot does it get in the Napa Valley, the United States of America in August?

Expect daytime temperatures around 29°C (84°F) in Napa. That makes August a high month for the Napa Valley, the United States of America.

How cold does it get at night in the Napa Valley, the United States of America in August?

Nighttime temperatures in Napa typically drop to around 13°C (55°F) in August.

What is the warmest city in August in the Napa Valley, the United States of America?

From a thorough analysis of our records, Calistoga clearly dominates in terms of high temperatures. The city witnesses daytime temperatures hovering around 32°C (90°F), and evenings that remain near 12°C (54°F).

What is the coldest city in August in the Napa Valley, the United States of America?

When looking through our records, we find that American Canyon stands out as the coolest city in the Napa Valley, the United States of America for the month of August. Daytime highs average 27°C (81°F) and it cools down to about 12°C (54°F) at night.

How much sun does the Napa Valley, the United States of America get in August?

Napa enjoys close to 290 hours of sunlight. This not only brightens the days but also uplifts the atmosphere during the month.

Interested in more climate information?

We have much more information about the climate in the Napa Valley.

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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