Click on a day for an hourly weather forecast
The temperatures in West Chester in September are comfortable with low of 17°C and and high up to 26°C.
You can expect about 3 to 8 days of rain in West Chester 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 West Chester in September 2025.
If you’re planning to visit West Chester in the near future, we highly recommend that you review the 14 day weather forecast for West Chester before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -3° | 6 | 18 | 7 | 89 mm | Awful | West Chester in January |
| February | 5° / -2° | 7 | 14 | 7 | 122 mm | Awful | West Chester in February |
| March | 10° / 2° | 8 | 19 | 4 | 123 mm | Awful | West Chester in March |
| April | 17° / 8° | 6 | 24 | 0 | 104 mm | Good | West Chester in April |
| May | 22° / 13° | 7 | 24 | 0 | 124 mm | Ok | West Chester in May |
| June | 27° / 18° | 7 | 23 | 0 | 133 mm | Good | West Chester in June |
| July | 30° / 21° | 7 | 24 | 0 | 138 mm | Ok | West Chester in July |
| August | 29° / 20° | 6 | 25 | 0 | 150 mm | Good | West Chester in August |
| September | 26° / 17° | 5 | 25 | 0 | 110 mm | Perfect | West Chester in September |
| October | 19° / 11° | 5 | 26 | 0 | 136 mm | Good | West Chester in October |
| November | 12° / 5° | 5 | 25 | 1 | 81 mm | Ok | West Chester in November |
| December | 7° / 1° | 7 | 21 | 4 | 128 mm | Awful | West Chester in December |