Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 30° / 16° | 2 | 29 | 0 | 13 mm | Good | Horsham in January |
| February | 29° / 16° | 2 | 27 | 0 | 7 mm | Good | Horsham in February |
| March | 26° / 14° | 2 | 29 | 0 | 9 mm | Perfect | Horsham in March |
| April | 21° / 12° | 3 | 27 | 0 | 11 mm | Good | Horsham in April |
| May | 16° / 9° | 3 | 28 | 0 | 13 mm | Good | Horsham in May |
| June | 13° / 7° | 3 | 27 | 0 | 16 mm | Ok | Horsham in June |
| July | 13° / 6° | 5 | 27 | 0 | 16 mm | Ok | Horsham in July |
| August | 14° / 6° | 5 | 26 | 0 | 18 mm | Good | Horsham in August |
| September | 16° / 6° | 4 | 26 | 0 | 17 mm | Good | Horsham in September |
| October | 20° / 8° | 4 | 28 | 0 | 16 mm | Good | Horsham in October |
| November | 24° / 11° | 3 | 27 | 0 | 17 mm | Perfect | Horsham in November |
| December | 27° / 14° | 3 | 29 | 0 | 15 mm | Perfect | Horsham in December |