The temperatures in Horsham in September are quite cold with temperatures between 6°C and 16°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Horsham 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 Horsham in September 2025.
If you’re planning to visit Horsham in the near future, we highly recommend that you review the 14 day weather forecast for Horsham before you arrive.
Temperatures
16° / 6°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
17
mm
Sun Hours
1.8
Hrs
