S
M
T
W
T
F
S
26
63°
41°
27
70°
35°
28
66°
35°
29
62°
44°
30
53°
44°
1
62°
42°
2
56°
42°
3
57°
39°
4
66°
50°
5
77°
56°
6
67°
51°
7
62°
42°
8
58°
42°
9
60°
45°
10
62°
47°
11
63°
44°
12
64°
46°
13
61°
46°
14
64°
47°
15
65°
46°
16
65°
45°
17
64°
43°
18
65°
51°
19
66°
51°
20
67°
50°
21
72°
52°
22
70°
48°
23
64°
47°
24
66°
50°
25
67°
47°
26
68°
48°
27
67°
48°
28
66°
51°
29
68°
54°
30
72°
53°
31
69°
50°
1
68°
47°
2
67°
47°
3
68°
48°
4
68°
49°
5
69°
49°
6
69°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fitchburg
Fitchburg's May 2026 forecast shows daily high temperatures ranging from 56° to 77°, with overnight lows between 39° and 56°. The average high for May is 66° with an average low of 48°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Fitchburg. See also: June | July | August.
