Measurements:
°C
°F
CURRENT WEATHER
08:34
Thunder Bay
58°F
SE 6 mph
Feels like: 58°F
Precip: 7%
World Resorts Canada Thunder Bay Weather

7 Day Weather Forecast

08.19
wed
DAY
70°F
NE 2 mph
precip
6%
NIGHT
58°F
SW 8 mph
precip
10%
08.20
thu
DAY
60°F
W 6 mph
precip
15%
NIGHT
58°F
N 3 mph
precip
8%
08.21
fri
DAY
62°F
W 5 mph
precip
6%
NIGHT
60°F
SE 2 mph
precip
23%
08.22
sat
DAY
68°F
SE 7 mph
precip
3%
NIGHT
58°F
SE 8 mph
precip
5%
08.23
sun
DAY
58°F
W 2 mph
precip
3%
NIGHT
56°F
NE 5 mph
precip
29%
08.24
mon
DAY
56°F
NW 11 mph
precip
53%
NIGHT
58°F
NW 4 mph
precip
83%
08.25
tue
DAY
58°F
S 14 mph
precip
42%
NIGHT
62°F
NW 12 mph
precip
10%

Thunder Bay Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Thunder Bay was 16.2°F. The maximum and minimum values were 13.5°F and 17.6°F respectively.

Thunder Bay on the Weather Map

Best Time to Visit Thunder Bay
The most sunny months:
July 14 days
September 14 days
August 14 days
The most warm months:
July 73.4 °F
August 71.2 °F
June 65.3 °F
Warmest sea temperature:
August 64.9 °F
September 61.3 °F
July 59.4 °F
The most cold months:
January 9.8 °F
February 11.1 °F
December 17.9 °F
The most rainy months:
September 2 days
April 2 days
August 2 days
The most windy months:
November 9 mph
December 9 mph
April 8 mph
more details