S
M
T
W
T
F
S
1
13°
-26°
2
42°
-13°
3
31°
10°
4
26°
13°
5
18°
9°
6
33°
13°
7
34°
20°
8
53°
20°
9
43°
22°
10
24°
17°
11
36°
19°
12
27°
13°
13
31°
14°
14
36°
3°
15
28°
11°
16
17°
2°
17
19°
-9°
18
31°
12°
19
32°
4°
20
39°
23°
21
33°
22°
22
29°
11°
23
37°
13°
24
40°
26°
25
40°
23°
26
28°
11°
27
24°
10°
28
29°
9°
29
35°
9°
30
37°
17°
31
32°
14°
1
26°
1°
2
32°
23°
3
40°
25°
4
33°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
March Weather in Thunder Bay
Thunder Bay's March 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for March is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how March weather will actually feel in Thunder Bay. See also: April | May | June.
