New Hampshire weather in September 2025

The temperatures in New Hampshire in September are comfortable with low of 15°C and and high up to 29°C.

You can expect up to 3 rainy days in New Hampshire during the month of September.

Our weather forecast can give you a great sense of what weather to expect in New Hampshire in September 2025.

If you’re planning to visit New Hampshire in the near future, we highly recommend that you review the 14 day weather forecast for New Hampshire before you arrive.

Temperatures

29° / 15°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

11.9

Hrs

Explore the weather in New Hampshire in other months

Month	Temperatures	Rainy Days	Dry Days	Rainfall	Weather	More details
January	14° / 6°	5	26	92 mm	Good	New Hampshire in January
February	16° / 6°	4	24	90 mm	Good	New Hampshire in February
March	17° / 7°	6	26	89 mm	Good	New Hampshire in March
April	20° / 8°	2	28	36 mm	Good	New Hampshire in April
May	23° / 10°	1	30	16 mm	Perfect	New Hampshire in May
June	27° / 13°	0	30	6 mm	Perfect	New Hampshire in June
July	29° / 14°	0	31	2 mm	Good	New Hampshire in July
August	29° / 15°	0	31	1 mm	Good	New Hampshire in August
September	29° / 15°	0	30	4 mm	Good	New Hampshire in September
October	24° / 13°	2	29	35 mm	Perfect	New Hampshire in October
November	18° / 9°	3	27	55 mm	Good	New Hampshire in November
December	14° / 7°	5	26	79 mm	Good	New Hampshire in December