Temperature in The Napa Valley in May

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

The Napa Valley, the United States of America, a region in the United States of America, experiences high average maximum daytime temperatures in May, ranging from 23°C (73°F) in American Canyon to 26°C (79°F) in St. Helena. Nighttime temperatures generally drop to 10°C (50°F) in St. Helena and 9°C (48°F) in American Canyon.

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

Discover the typical May temperatures for the most popular locations of the Napa Valley on the map below. Detailed insights are just a click away.

Select a Month

Check the conditions for any month of the year.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 May

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 May: blue is cold, red is hot.

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

The Napa Valley temperatures in May: frequently asked questions

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

Napa averages a daytime high of 25°C (77°F) in May, which is high 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 May?

Nighttime temperatures in Napa typically drop to around 10°C (50°F) in May.

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

Based on our systematic data collection, St. Helena has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 26°C (79°F), while at night it goes down to an approximate temperature of 10°C (50°F).

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

For the month of May, American Canyon is the most temperate city in the Napa Valley, the United States of America based on our records. Highs average 23°C (73°F) and nighttime temperatures dip to around 9°C (48°F).

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

The weather is predominantly sunny, with an estimated total of around 310 hours of sunshine in Napa. This means many sunny days, which creates a cheerful atmosphere during this month.

Interested in more climate information?

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

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