Boston weather in September 2025

The temperatures in Boston in September are comfortable with low of 15°C and and high up to 24°C.

You can expect about 3 to 8 days of rain in Boston 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 Boston in September 2025.

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

Temperatures

24° / 15°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

10.0

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 24° /17°	2 23° /15°	3 26° /16°	4 27° /16°	5 23° /16°	6 23° /17°
7 25° /16°	8 27° /16°	9 25° /17°	10 24° /17°	11 25° /15°	12 24° /16°	13 24° /17°
14 23° /15°	15 24° /15°	16 22° /14°	17 23° /15°	18 20° /15°	19 20° /14°	20 21° /13°
21 21° /12°	22 21° /14°	23 21° /15°	24 22° /15°	25 21° /14°	26 23° /15°	27 23° /14°
28 21° /14°	29 19° /14°	30 18° /12°

Explore the weather in Boston in other months

Boston annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	1° / -5°	6	15	10	119 mm	Awful	Boston in January
February	2° / -4°	6	12	10	131 mm	Awful	Boston in February
March	7° / 0°	7	15	8	149 mm	Awful	Boston in March
April	13° / 5°	8	20	2	133 mm	Awful	Boston in April
May	20° / 10°	7	24	0	100 mm	Ok	Boston in May
June	24° / 15°	7	23	0	120 mm	Good	Boston in June
July	28° / 19°	7	24	0	119 mm	Good	Boston in July
August	28° / 19°	4	27	0	99 mm	Perfect	Boston in August
September	24° / 15°	4	26	0	79 mm	Perfect	Boston in September
October	17° / 10°	6	25	0	134 mm	Good	Boston in October
November	10° / 4°	6	22	2	111 mm	Bad	Boston in November
December	5° / -1°	7	17	7	143 mm	Awful	Boston in December