Thunder Bay Weather: September
 |
Average Day Temperature: | 64.2°F |
|
Average Night Temperature: | 53.8°F |
|
Sea Water Temperature: | 61.3°F |
|
Number of Sunny Days: | 13 days |
| Sunshine Hours: | 11.7 - 13.4 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 0.8 in | |
| detailed information | ||
forecast
| Thunder Bay |
Temperature
| Thunder Bay |
Air Temperature in September, °F
The highest day temperature in September 2026 was 86°F. The lowest night temperature was 47°F. The average values for day and night temperatures during September were 64.1°F и 55.6°F respectivly.
Thunder Bay Water Sea Temperature in September, °F
The average sea surface temperature in September 2026 for Thunder Bay was 60.9°F. The maximum and minimum values were 50.8°F and 67.2°F respectively.
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 0.8 in. It makes september one of the most rainy months of the year.
The average wind speed in September is 7.1 mph.
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 7.3 hours.
Thunder Bay on the Weather Map
| Halifax |  |
+56 |
| Moncton |  |
+52 |
| Montreal | |
+52 |
| Nanaimo | |
+54 |
| Niagara Falls | |
+64 |
| Ottawa | |
+56 |
| Prince Edward Island | |
+54 |
| Quebec | |
+52 |
| Saint Andrews | |
+56 |
| St. John's |  |
+40 |
| Sydney | |
+52 |
| Toronto | |
+72 |
| Vancouver | |
+54 |
| Victoria | |
+56 |
| Winnipeg | |
+52 |
| 2100 |  |
58°F | W 3 mph |
| 0000 | |
58°F | NW 3 mph |
| 0300 | |
58°F | W 4 mph |
| 0600 | |
58°F | N 4 mph |
| 0900 | |
58°F | N 9 mph |
| 1200 | |
60°F | N 12 mph |
| 1500 |  |
62°F | N 13 mph |
| 1800 | |
62°F | NE 15 mph |