Click on a day for an hourly weather forecast
The temperatures in Nashua in September are comfortable with low of 13°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Nashua 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 Nashua in September 2025.
If you’re planning to visit Nashua in the near future, we highly recommend that you review the 14 day weather forecast for Nashua before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -8° | 8 | 18 | 5 | 79 mm | Awful | Nashua in January |
| February | 2° / -7° | 8 | 14 | 6 | 86 mm | Awful | Nashua in February |
| March | 6° / -3° | 7 | 20 | 4 | 91 mm | Awful | Nashua in March |
| April | 13° / 3° | 7 | 22 | 1 | 91 mm | Bad | Nashua in April |
| May | 20° / 9° | 8 | 23 | 0 | 72 mm | Ok | Nashua in May |
| June | 25° / 14° | 8 | 22 | 0 | 96 mm | Good | Nashua in June |
| July | 28° / 17° | 10 | 21 | 0 | 106 mm | Good | Nashua in July |
| August | 28° / 17° | 8 | 23 | 0 | 88 mm | Good | Nashua in August |
| September | 23° / 13° | 6 | 24 | 0 | 78 mm | Perfect | Nashua in September |
| October | 16° / 7° | 7 | 23 | 0 | 115 mm | Ok | Nashua in October |
| November | 9° / 1° | 6 | 22 | 1 | 80 mm | Ok | Nashua in November |
| December | 3° / -3° | 8 | 18 | 5 | 112 mm | Awful | Nashua in December |