Measurements:
°C
°F
CURRENT WEATHER
08:56
Thunder Bay
16°F
SE 13 mph
Feels like: 2°F
Precip: 0%
World Resorts Canada Thunder Bay Weather

7 Day Weather Forecast

04.19
sun
DAY
20°F
SE 13 mph
precip
0%
NIGHT
22°F
SE 7 mph
precip
0%
04.20
mon
DAY
32°F
N 11 mph
precip
0%
NIGHT
28°F
NE 4 mph
precip
0%
04.21
tue
DAY
42°F
SE 11 mph
precip
0%
NIGHT
28°F
NW 2 mph
precip
0%
04.22
wed
DAY
42°F
NW 7 mph
precip
0%
NIGHT
34°F
SW 6 mph
precip
0%
04.23
thu
DAY
34°F
W 12 mph
precip
65%
NIGHT
38°F
SW 8 mph
precip
100%
04.24
fri
DAY
38°F
W 10 mph
precip
100%
NIGHT
36°F
NE 2 mph
precip
0%
04.25
sat
DAY
42°F
E 12 mph
precip
0%
NIGHT
32°F
E 6 mph
precip
0%

Thunder Bay Sea Water Temperature in April, °F

Select Year: 2026 2025 2024

The average sea surface temperature in April 2026 for Thunder Bay was 0.5°F. The maximum and minimum values were 0.4°F and 0.7°F respectively.

Thunder Bay on the Weather Map

Best Time to Visit Thunder Bay
The most sunny months:
September 14 days
August 14 days
July 12 days
The most warm months:
July 71.5 °F
August 71.2 °F
June 64.4 °F
Warmest sea temperature:
August 64.9 °F
September 61.3 °F
July 60.6 °F
The most cold months:
January 9.8 °F
February 11.1 °F
December 17.9 °F
The most rainy months:
September 2 days
August 2 days
April 2 days
The most windy months:
November 9 mph
December 9 mph
April 9 mph
more details