Weather by month in Napa Valley

Napa Valley is a region in the United States of America. Many people wonder what the weather conditions are in Napa Valley over the year. What is the best time to visit Napa Valley?

This page shows the average weather conditions by month in Napa Valley over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

January is a winter month. In Napa you can expect mild maximum average daytime temperatures around 15°C and nighttime temperatures around 4°C.

Find more detailed climate information for Napa Valley in January here.

February is a winter month. In Napa you can expect mild maximum average daytime temperatures around 17°C and nighttime temperatures around 5°C.

Find more detailed climate information for Napa Valley in February here.

In Napa you can expect pleasant maximum average daytime temperatures around 19°C and nighttime temperatures around 6°C.

Find more detailed climate information for Napa Valley in March here.

The temperatures range from pleasant in American Canyon with 20°C to high in St. Helena with 22°C.

Find more detailed climate information for Napa Valley in April here.

The average maximum daytime temperatures are high and range from 23°C in American Canyon to 26°C in St. Helena.

Find more detailed climate information for Napa Valley in May here.

The average maximum daytime temperatures are high and range from 26°C in American Canyon to 30°C in St. Helena.

Find more detailed climate information for Napa Valley in June here.

July is a summer month. The temperatures range from high in American Canyon with 27°C to very high in Calistoga with 32°C. These night and day temperatures are an average and some days may be even warmer. So be prepared and bring light clothes.

Find more detailed climate information for Napa Valley in July here.

August is a summer month. The temperatures range from high in American Canyon with 27°C to very high in Calistoga with 32°C.

Find more detailed climate information for Napa Valley in August here.

September is a summer month. The temperatures range from high in American Canyon with 28°C to very high in Calistoga with 31°C. On average, this month is one of the warmest months of the year in Napa Valley. So be prepared and make sure to dress lightly.

Find more detailed climate information for Napa Valley in September here.

In Napa you can expect warm maximum average daytime temperatures around 26°C and nighttime temperatures around 9°C.

Find more detailed climate information for Napa Valley in October here.

In Napa you can expect pleasant maximum average daytime temperatures around 19°C and nighttime temperatures around 6°C.

Find more detailed climate information for Napa Valley in November here.

December is a winter month. In Napa you can expect mild maximum average daytime temperatures around 14°C and nighttime temperatures around 4°C. On average, this month is the coldest month of the year in Napa Valley.

Find more detailed climate information for Napa Valley in December here.