S
M
T
W
T
F
S
26
82°
63°
27
85°
64°
28
75°
67°
29
74°
63°
30
79°
60°
31
84°
59°
1
82°
61°
2
73°
66°
3
78°
58°
4
81°
63°
5
81°
67°
6
85°
67°
7
84°
63°
8
83°
62°
9
84°
61°
10
83°
60°
11
81°
60°
12
78°
58°
13
80°
58°
14
81°
60°
15
80°
58°
16
76°
54°
17
84°
62°
18
83°
59°
19
83°
61°
20
82°
58°
21
79°
54°
22
80°
60°
23
84°
61°
24
84°
62°
25
82°
61°
26
80°
61°
27
78°
60°
28
79°
59°
29
79°
60°
30
80°
59°
31
79°
58°
1
81°
53°
2
73°
51°
3
72°
50°
4
72°
50°
5
74°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Petersburg
Petersburg's August 2026 forecast shows daily high temperatures ranging from 72° to 85°, with overnight lows between 50° and 67°. The average high for August is 80° 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 Petersburg. See also: September | October | November.
