Click on a day for an hourly weather forecast
The temperatures in Stevenage in September are usually low and can range between 12°C and 19°C.
You can expect about 3 to 8 days of rain in Stevenage 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 Stevenage in September 2025.
If you’re planning to visit Stevenage in the near future, we highly recommend that you review the 14 day weather forecast for Stevenage before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 2° | 7 | 20 | 4 | 65 mm | Awful | Stevenage in January |
| February | 8° / 2° | 8 | 15 | 5 | 62 mm | Awful | Stevenage in February |
| March | 11° / 4° | 5 | 24 | 2 | 52 mm | Bad | Stevenage in March |
| April | 14° / 5° | 4 | 25 | 1 | 44 mm | Good | Stevenage in April |
| May | 17° / 8° | 4 | 27 | 0 | 62 mm | Good | Stevenage in May |
| June | 20° / 11° | 5 | 25 | 0 | 88 mm | Good | Stevenage in June |
| July | 22° / 13° | 5 | 26 | 0 | 74 mm | Good | Stevenage in July |
| August | 22° / 14° | 4 | 27 | 0 | 70 mm | Good | Stevenage in August |
| September | 19° / 12° | 3 | 27 | 0 | 45 mm | Good | Stevenage in September |
| October | 15° / 9° | 6 | 25 | 0 | 66 mm | Good | Stevenage in October |
| November | 10° / 6° | 6 | 24 | 0 | 59 mm | Ok | Stevenage in November |
| December | 7° / 3° | 8 | 20 | 3 | 74 mm | Awful | Stevenage in December |