S
M
T
W
T
F
S
26
82°
49°
27
87°
50°
28
84°
61°
29
68°
64°
30
79°
62°
31
82°
60°
1
88°
63°
2
86°
71°
3
78°
62°
4
86°
59°
5
87°
61°
6
91°
68°
7
91°
73°
8
89°
69°
9
88°
66°
10
88°
68°
11
86°
59°
12
80°
60°
13
84°
59°
14
78°
55°
15
81°
57°
16
80°
58°
17
79°
59°
18
81°
59°
19
81°
63°
20
80°
62°
21
82°
63°
22
80°
65°
23
83°
63°
24
76°
58°
25
76°
58°
26
79°
62°
27
83°
62°
28
83°
59°
29
76°
56°
30
74°
54°
31
74°
53°
1
75°
53°
2
74°
56°
3
74°
57°
4
75°
60°
5
75°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Fitchburg
Fitchburg's August 2026 forecast shows daily high temperatures ranging from 74° to 88°, with overnight lows between 53° and 68°. The average high for August is 79° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Fitchburg. See also: September | October | November.
