17.05
sun
sun
Day
48°F
W 11 mph
Precip.
0%
0%
Night
46°F
W 7 mph
Precip.
0%
0%
18.05
mon
mon
Day
50°F
SW 6 mph
Precip.
0%
0%
Night
43°F
S 6 mph
Precip.
64%
64%
19.05
tue
tue
Day
41°F
SE 9 mph
Precip.
0%
0%
Night
36°F
SE 7 mph
Precip.
0%
0%
20.05
wed
wed
Day
46°F
SE 2 mph
Precip.
0%
0%
Night
36°F
NE 3 mph
Precip.
0%
0%
21.05
thu
thu
Day
50°F
N 9 mph
Precip.
0%
0%
Night
37°F
SW 2 mph
Precip.
0%
0%
22.05
fri
fri
Day
43°F
N 4 mph
Precip.
100%
100%
Night
43°F
NE 2 mph
Precip.
53%
53%
23.05
sat
sat
Day
50°F
S 2 mph
Precip.
0%
0%
Night
39°F
W 2 mph
Precip.
0%
0%
24.05
sun
sun
Day
50°F
NW 7 mph
Precip.
0%
0%
Night
43°F
W 7 mph
Precip.
28%
28%
25.05
mon
mon
Day
52°F
NE 9 mph
Precip.
100%
100%
Night
50°F
E 7 mph
Precip.
0%
0%
26.05
tue
tue
Day
66°F
NE 8 mph
Precip.
0%
0%
Night
52°F
W 3 mph
Precip.
0%
0%
27.05
wed
wed
Day
59°F
NW 7 mph
Precip.
66%
66%
Night
50°F
W 4 mph
Precip.
100%
100%
28.05
thu
thu
Day
54°F
NW 5 mph
Precip.
100%
100%
Night
54°F
N 3 mph
Precip.
100%
100%
29.05
fri
fri
Day
54°F
N 14 mph
Precip.
100%
100%
Night
45°F
SE 19 mph
Precip.
100%
100%
30.05
sat
sat
Day
52°F
SE 17 mph
Precip.
0%
0%
Night
54°F
E 8 mph
Precip.
0%
0%
sea water
temperature
temperature
| Thunder Bay |
monthly
weather
weather
| Thunder Bay |
current
weather
weather
| Thunder Bay |
7 days
forecast
forecast
| Thunder Bay |
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 36.1°F. The highest and lowest sea temperatures during the month were 40.8°F and 34.0°F.
Air temperature in Thunder Bay, °F
Precipitation total in Thunder Bay, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Thunder Bay
Thunder Bay on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
Thunder Bay
Local time: 15:10
May 17, sunday
1800
54°F
W
11 mph
11 mph
2100
50°F
W
6 mph
6 mph
May 18, monday
0000
46°F
W
7 mph
7 mph
0300
41°F
W
9 mph
9 mph
0600
43°F
W
9 mph
9 mph
0900
43°F
S
9 mph
9 mph
1200
50°F
SW
6 mph
6 mph
1500
52°F
SW
6 mph
6 mph
