The temperatures in Fairfax in September are comfortable with low of 17°C and and high up to 27°C.
You can expect about 3 to 8 days of rain in Fairfax during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Fairfax in September 2025.
If you’re planning to visit Fairfax in the near future, we highly recommend that you review the 14 day weather forecast for Fairfax before you arrive.
Temperatures
27° / 17°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
130
mm
Sun Hours
10.2
Hrs
