Thunder Bay Weather: May
 |
Average Day Temperature: | 53.0°F |
|
Average Night Temperature: | 41.8°F |
|
Sea Water Temperature: | 39.2°F |
|
Number of Sunny Days: | 11 days |
| Sunshine Hours: | 14.6 - 15.8 hours | |
|
Number of Rainy Days: | 1 day |
| Precipitation Totals: | 0.6 in | |
| detailed information | ||
forecast
| Thunder Bay |
Temperature
| Thunder Bay |
Air Temperature in May, °F
The highest day temperature in May 2025 was 78°F. The lowest night temperature was 30°F. The average values for day and night temperatures during May were 55.8°F и 41.7°F respectivly.
Thunder Bay Water Sea Temperature in May, °F
The average sea surface temperature in May 2025 for Thunder Bay was 39.9°F. The maximum and minimum values were 34.6°F and 49.6°F respectively.
You can expect various weather conditions during May. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in May, in
Precipitation total in May for Thunder Bay is 0.6 in.
The average wind speed in May is 6.9 mph. It makes May one of the most windless months of the year for Thunder Bay.
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 May is 8.2 hours.
Thunder Bay on the Weather Map
| Halifax |  |
+12 |
| Kingston |  |
+4 |
| Moncton | |
-6 |
| Montreal | |
-2 |
| Niagara Falls | |
+10 |
| Ottawa | |
-4 |
| Prince Edward Island |  |
+6 |
| Quebec | |
-12 |
| Rocky Harbour |  |
+28 |
| St. John's | |
+32 |
| Sydney | |
+24 |
| Toronto | |
+10 |
| Vancouver | |
+42 |
| Victoria | |
+44 |
| Winnipeg | |
+12 |
| 0300 |  |
8°F | E 9 mph |
| 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 |
| 0000 |  |
14°F | SE 14 mph |