What’s the climate like in Napa?
The current climate of Napa features average monthly temperatures ranging from highs of 28°C during the day to lows of 15°C. The average yearly temperature is around 22°C. At night, temperatures in the colder months average around 4°C and in the warmer months around 14°C.
The highest temperature recorded in Napa in recent years was 44°C in September 2022. The lowest daytime temperature recorded was 6°C in December 2022.
On average, Napa receives 633 mm of precipitation each year. For comparison, London gets 701 mm of precipitation annually.
Best time to visit Napa?
The best time to visit Napa for sunny weather is February through November. During this period, you'll have good temperatures and not too much rain, making it a great time to visit Napa. In the other months of the year, there's too much rain or the temperature isn't ideal for a visit if you want sunny and pleasant weather.
Climate Table of Napa
The climate table of Napa shows the average temperatures, precipitation, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 15 | 18 | 18 | 21 | 23 | 27 | 27 | 27 | 28 | 25 | 19 | 15 |
| Temp. min (°C) | 6 | 5 | 7 | 8 | 10 | 12 | 14 | 14 | 13 | 9 | 6 | 5 |
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| Precipitation (mm) | 203 | 108 | 80 | 31 | 8,9 | 2,5 | 0,6 | 0,6 | 3,1 | 56 | 32 | 107 |
| UV Index | 3 | 5 | 7 | 8 | 8 | 9 | 9 | 9 | 7 | 6 | 4 | 3 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
- Average yearly temperature: 22°C
- Highest temperature: 28°C in September
- Lowest temperature: 15°C in January and December
- Precipitation: 633 mm per year, averaging 53 mm per month
- Driest months: 0,6 mm in July, August and 2,5 mm in June
- Wettest months: 203 mm in January, 108 mm in February and 107 mm in December
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Table of Contents
Average Temperature per Month in Napa
This graph shows the average maximum temperatures per month in Napa, California. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Napa
This graph shows how much precipitation Napa, California, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average UV Index per Month in Napa
This graph shows the average UV index per month in Napa, California. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Yearly Temperature in Napa
This graph shows the average yearly temperature in Napa, California. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Napa
This chart shows the total yearly precipitation in Napa, California, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Weather experiences in Napa
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Average Weather in Napa by Month
Click on a month below to see detailed weather info for Napa. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
