Temperatures in July
It's warm in July in Napa with an average temperature of 27°C. Temperatures this month range from a low of 24°C to a high of 30°C. At night, you can expect temperatures between 13°C and 15°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Napa in July. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of July
The month of July starts in Napa with hot temperatures, averaging around 27°C during the day and nights close to 14°C. You won’t see any precipitation in the first days of the month, it’s all sunny skies.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-July
By mid-July, the average daytime temperature stays the same at 27°C, with nights close to 14°C. No precipitation expected during this period, so you can enjoy plenty of sunshine.
Temperatures vary between day and night, so it’s smart to wear layers.
End of July
By the end of July, the average daytime temperature in Napa will be around 28°C, with nights close to 14°C. No precipitation expected, with plenty of sunshine on the horizon.
As it gets cooler in the evening, it’s best to wear layers.
Precipitation in July
According to weather history, there is only 0,5 mm of precipitation in July. The wind speed is around 4 Bft, mostly coming from the Southwest.
The average chance of precipitation is only 1% in July.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in July for Napa. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Napa in July |
London | ||
|---|---|---|---|
 Average Temperature |
27°C | 23°C | |
 High Temp |
30°C | 27°C | |
| Low Temp |
24°C | 21°C | |
 Total Precipitation |
0,5 mm | 52 mm | |
| Rainy Days |
0 days | 9 days | |
June
UV index
The UV index is a maximum of 10 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is July a good time to visit Napa?
Want nice weather? Then July is a great time to be in Napa. You’ll have pleasant temperatures and little chance of rain this month.
Temperature records for Napa in July
With 37°C, Napa hit the highest temperature in the last 10 years in July 2017. The lowest daytime temperature in this month was 18°C in 2015. The extreme night temperatures ranged from a low of 8°C to a high of 18°C.
Check out the climate of Napa for all months and discover the best travel time
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Daily Temperature in July in Napa
This chart shows the average daily temperatures, both day and night, for each day in July in Napa, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in July in Napa
The chart below shows the average daily precipitation in July for Napa, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for July, you can expect it to stay dry all month in Napa.
Daily UV Index in July in Napa
This chart shows the average daily UV index in July in Napa, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in July in Napa Over the Years
This chart shows the average temperature in July in Napa, measured in degrees Celsius, over the past years.
Total Precipitation in July in Napa Over the Years
This chart shows the average precipitation in July in Napa, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in July for Napa
Click on a specific day in July for detailed info on the typical weather on that day in Napa. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in July in Napa
Have you been to Napa in July?
Share your weather experience in July in Napa.
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.
