Lewiston weather in September 2025

The temperatures in Lewiston in September are comfortable with low of 11°C and and high up to 21°C.

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

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

Temperatures

21° / 11°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

9.9

Hrs

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

Explore the weather in Lewiston in other months

Lewiston annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	-3° / -9°	4	15	12	108 mm	Awful	Lewiston in January
February	-1° / -9°	4	11	13	113 mm	Awful	Lewiston in February
March	3° / -4°	7	14	11	124 mm	Awful	Lewiston in March
April	10° / 2°	8	18	4	134 mm	Awful	Lewiston in April
May	17° / 8°	8	23	0	110 mm	Ok	Lewiston in May
June	22° / 12°	7	23	0	134 mm	Ok	Lewiston in June
July	25° / 15°	6	25	0	104 mm	Perfect	Lewiston in July
August	25° / 15°	5	26	0	111 mm	Perfect	Lewiston in August
September	21° / 11°	5	25	0	84 mm	Good	Lewiston in September
October	14° / 6°	7	23	0	143 mm	Ok	Lewiston in October
November	7° / 0°	6	20	4	115 mm	Bad	Lewiston in November
December	1° / -4°	7	14	10	149 mm	Awful	Lewiston in December