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Thunder Bay weather in September

Weather in Thunder Bay: September

Average day temperature: 62.7°F
Average night temperature: 53.4°F
Sea water temperature: 60.2°F
Number of sunny days: 15 days
Day length: 11.7 - 13.4 hours
Number of rainy days: 2 days
Precipitation totals: 0.8 in.

Air temperature in September, °F

Show year:
2024
2023
2022

The highest day temperature during September of 2024 was 82°F. At the same time the lowest night temperature was 39°F. Day and night temperature averages during September were 67.7°F and 55.0°F.

Sea water temperature in Thunder Bay in September, °F

Show year:
2024
2023
2022

The average sea water temperature in September of 2024 was 63.7°F. The highest and lowest sea temperatures during the month were 65.8°F and 61.2°F.

Sunny, partly cloudy and cloudy days

Mostly all days in September are sunny but cloudy days are also possible.

Precipitation total in September, in.

Precipitation total value in Thunder Bay in September is 0.8 in. Other months of the year show relatively similar values.

Wind speed in September, mph

The average wind speed value in September is 7.0 mph

Average sunny hours

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 7.9.

Best time for vacation in Thunder Bay

Sunniest months:
September 15 days
August 14 days
July 12 days
Warmest months:
July 69.3 °F
August 68.9 °F
June 62.8 °F
Warmest sea temp:
August 63.5 °F
September 60.2 °F
July 59.3 °F
Coldest months:
February 14.2 °F
January 15.0 °F
December 22.1 °F
Rainiest months:
August 3 days
September 2 days
April 2 days
Windiest months:
November 9.7 mph
December 9.2 mph
April 9.1 mph

Thunder Bay on a weather map

Thunder Bay
+39°F
S 17 mph
Feels like: +30°F
Precip.: 0%
Places in Canada:
Name
°F
+43°F
+46°F
+30°F
+43°F
+30°F
-13°F
+37°F
+39°F
+43°F
+41°F
+41°F
+45°F
+39°F
+39°F
24 Hours Forecast
Thunder Bay
Local time: 05:51
November 21, thursday
0600
39°F
S
17 mph
0900
41°F
S
19 mph
1200
41°F
S
17 mph
1500
43°F
S
16 mph
1800
41°F
S
13 mph
2100
39°F
S
13 mph
November 22, friday
0000
39°F
S
11 mph
0300
37°F
SE
11 mph
Units of measurement: °C / °F