Weather in September 2025

Napa weather in September 2025

°C °F

The average weather in Napa in September

The temperatures in Napa in September are comfortable with low of 15°C and and high up to 29°C.

You can expect up to 3 rainy days in Napa during the month of September.

Our weather forecast can give you a great sense of what weather to expect in Napa in September 2025.

If you’re planning to visit Napa in the near future, we highly recommend that you review the 14 day weather forecast for Napa before you arrive.

Temperatures
29° / 15°
Rainy Days
0
Snowy Days
0
Dry Days
30
Rainfall
3
mm
Sun Hours
11.9
Hrs

Explore the weather in Napa in other months

Napa annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January 15° / 7° 5 26 0 121 mm
Good
February 16° / 7° 4 24 0 111 mm
Good
March 17° / 8° 6 25 0 103 mm
Good
April 20° / 9° 3 28 0 41 mm
Good
May 23° / 11° 2 29 0 25 mm
Perfect
June 27° / 13° 1 29 0 7 mm
Perfect
July 29° / 14° 0 31 0 2 mm
Good
August 29° / 15° 0 31 0 2 mm
Good
September 29° / 15° 0 30 0 3 mm
Good
October 24° / 14° 2 29 0 47 mm
Perfect
November 18° / 10° 3 27 0 65 mm
Good
December 14° / 7° 5 26 0 96 mm
Good

Weather in Napa in September - FAQ

What is the average temperature in Napa in September?
The average temperature in Napa in September is 15/29° C.
What is the chance of rain in Napa in September?
On average, there are 0 rainy days in Napa during September.
Weather wise, is September a good time to visit Napa?
The weather in Napa in September is good.
Can it snow in Napa in September?
On average, there are 0 snowy days in Napa in September.
More about the weather in Napa