Thunder Bay Weather: September
 |
Average Day Temperature: | 64.3°F |
|
Average Night Temperature: | 53.5°F |
|
Sea Water Temperature: | 61.3°F |
|
Number of Sunny Days: | 14 days |
| Sunshine Hours: | 11.7 - 13.4 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 0.7 in | |
| detailed information | ||
14 day weather
forecast
forecast
| Thunder Bay |
Sea Water
Temperature
Temperature
| Thunder Bay |
Air Temperature in September, °F
The highest day temperature in September 2025 was 81°F. The lowest night temperature was 39°F. The average values for day and night temperatures during September were 64.7°F и 52.3°F respectivly.
Thunder Bay Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Thunder Bay was 61.0°F. The maximum and minimum values were 58.2°F and 63.6°F respectively.
Sunny, Cloudy and Gloomy days
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Thunder Bay is 0.7 in.
Wind Speed in September, mph
The average wind speed in September is 6.9 mph.
Average Sunny Hours Per Day
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Thunder Bay in September is 7.4 hours.
Thunder Bay on the Weather Map
Canada Resorts:
NAME
F°
| Halifax |  |
+12 |
| Kingston |  |
+4 |
| Moncton | |
-6 |
| Montreal | |
-2 |
| Niagara Falls | |
+10 |
| Ottawa | |
-6 |
| Prince Edward Island |  |
+6 |
| Quebec | |
-12 |
| Rocky Harbour |  |
+22 |
| St. John's |  |
+36 |
| Sydney | |
+24 |
| Toronto | |
+10 |
| Vancouver | |
+42 |
| Victoria | |
+44 |
| Winnipeg | |
+8 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Thunder Bay
Local time: 03:27
05 dec, friday
| 0600 |  |
6°F | E 6 mph |
| 0900 |  |
6°F | E 4 mph |
| 1200 |  |
12°F | E 4 mph |
| 1500 |  |
18°F | NE 7 mph |
| 1800 | |
18°F | E 7 mph |
| 2100 | |
16°F | E 8 mph |
06 dec, saturday
| 0000 |  |
14°F | SE 14 mph |
| 0300 | |
10°F | SE 12 mph |