Click on a day for an hourly weather forecast
The temperatures in Northamptonshire in September are usually low and can range between 11°C and 19°C.
You can expect about 3 to 8 days of rain in Northamptonshire 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 Northamptonshire in September 2025.
If you’re planning to visit Northamptonshire in the near future, we highly recommend that you review the 14 day weather forecast for Northamptonshire before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 1° | 6 | 21 | 4 | 47 mm | Awful | Northamptonshire in January |
| February | 7° / 2° | 7 | 16 | 5 | 48 mm | Bad | Northamptonshire in February |
| March | 10° / 3° | 5 | 25 | 1 | 44 mm | Ok | Northamptonshire in March |
| April | 13° / 4° | 4 | 26 | 0 | 41 mm | Ok | Northamptonshire in April |
| May | 16° / 7° | 5 | 26 | 0 | 66 mm | Good | Northamptonshire in May |
| June | 19° / 10° | 5 | 25 | 0 | 75 mm | Good | Northamptonshire in June |
| July | 21° / 12° | 5 | 26 | 0 | 73 mm | Good | Northamptonshire in July |
| August | 21° / 13° | 5 | 26 | 0 | 72 mm | Good | Northamptonshire in August |
| September | 19° / 11° | 3 | 27 | 0 | 39 mm | Good | Northamptonshire in September |
| October | 14° / 8° | 5 | 26 | 0 | 58 mm | Good | Northamptonshire in October |
| November | 10° / 5° | 6 | 23 | 1 | 52 mm | Ok | Northamptonshire in November |
| December | 7° / 3° | 6 | 22 | 2 | 60 mm | Bad | Northamptonshire in December |
For a more accurate weather forecast please select a city