Measurements:
°C
°F
CURRENT WEATHER
06:36
Thunder Bay
66°F
N 1 mph
Feels like: 66°F
Precip: 14%
World Resorts Canada Thunder Bay Weather

7 Day Weather Forecast

07.30
thu
DAY
86°F
NE 7 mph
precip
8%
NIGHT
72°F
SE 9 mph
precip
9%
07.31
fri
DAY
82°F
SE 2 mph
precip
3%
NIGHT
62°F
S 6 mph
precip
12%
08.01
sat
DAY
72°F
SW 7 mph
precip
5%
NIGHT
56°F
S 3 mph
precip
9%
08.02
sun
DAY
68°F
NW 7 mph
precip
5%
NIGHT
52°F
W 2 mph
precip
8%
08.03
mon
DAY
74°F
N 9 mph
precip
6%
NIGHT
64°F
NW 4 mph
precip
18%
08.04
tue
DAY
60°F
SE 7 mph
precip
62%
NIGHT
52°F
NE 2 mph
precip
18%
08.05
wed
DAY
72°F
NE 6 mph
precip
2%
NIGHT
56°F
NW 2 mph
precip
12%

Thunder Bay Sea Water Temperature in July, °F

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Thunder Bay was 10.9°F. The maximum and minimum values were 7.1°F and 15.6°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
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