Weather in September 2025

Fullerton weather in September 2025

°C °F

The average weather in Fullerton in September

The weather in Fullerton in September is hot. The average temperatures are between 20°C and 30°C.

There shouldn't be any rainy days in in Fullerton during September. Having said that, the days are very hot in September so hanging out outside is more recomanded during the after noons and evening time.

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

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

Temperatures
30° / 20°
Rainy Days
0
Snowy Days
0
Dry Days
30
Rainfall
4
mm
Sun Hours
11.4
Hrs

Explore the weather in Fullerton in other months

Fullerton annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January 20° / 10° 3 28 0 63 mm
Good
February 20° / 10° 3 26 0 52 mm
Good
March 21° / 11° 3 28 0 47 mm
Good
April 22° / 13° 1 29 0 17 mm
Good
May 23° / 14° 1 30 0 7 mm
Perfect
June 26° / 16° 0 30 0 1 mm
Perfect
July 29° / 19° 1 31 0 2 mm
Good
August 30° / 20° 0 31 0 1 mm
Good
September 30° / 20° 0 30 0 4 mm
Good
October 27° / 17° 1 30 0 12 mm
Perfect
November 23° / 13° 2 28 0 19 mm
Perfect
December 19° / 10° 4 27 0 71 mm
Good

Weather in Fullerton in September - FAQ

What is the average temperature in Fullerton in September?
The average temperature in Fullerton in September is 20/30° C.
What is the chance of rain in Fullerton in September?
On average, there are 0 rainy days in Fullerton during September.
Weather wise, is September a good time to visit Fullerton?
The weather in Fullerton in September is good.
Can it snow in Fullerton in September?
On average, there are 0 snowy days in Fullerton in September.
More about the weather in Fullerton