Thunder Bay weather in September 2024

The temperatures in Thunder Bay in September are quite cold with temperatures between 9°C and 16°C, warm clothes are a must.

You can expect about 3 to 8 days of rain in Thunder Bay 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 Thunder Bay in September 2024.

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

Temperatures

16° / 9°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

9.8

Hrs

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

Explore the weather in Thunder Bay in other months

Thunder Bay annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	-10° / -16°	5	4	23	51 mm	Awful	Thunder Bay in January
February	-9° / -16°	4	5	20	51 mm	Awful	Thunder Bay in February
March	-2° / -8°	9	5	19	75 mm	Awful	Thunder Bay in March
April	4° / -2°	7	12	12	100 mm	Awful	Thunder Bay in April
May	12° / 4°	7	23	2	96 mm	Awful	Thunder Bay in May
June	17° / 9°	6	24	0	98 mm	Good	Thunder Bay in June
July	21° / 13°	5	26	0	90 mm	Good	Thunder Bay in July
August	21° / 13°	4	27	0	87 mm	Good	Thunder Bay in August
September	16° / 9°	5	25	0	84 mm	Good	Thunder Bay in September
October	8° / 3°	6	20	5	74 mm	Bad	Thunder Bay in October
November	1° / -4°	6	10	14	78 mm	Awful	Thunder Bay in November
December	-6° / -11°	5	6	21	69 mm	Awful	Thunder Bay in December