S
M
T
W
T
F
S
26
99°
75°
27
98°
76°
28
93°
73°
29
86°
67°
30
87°
67°
31
80°
67°
1
74°
68°
2
80°
65°
3
84°
64°
4
84°
65°
5
87°
67°
6
88°
70°
7
90°
72°
8
91°
68°
9
89°
67°
10
89°
68°
11
94°
69°
12
91°
67°
13
90°
70°
14
89°
66°
15
83°
62°
16
84°
64°
17
93°
71°
18
94°
70°
19
94°
71°
20
93°
69°
21
91°
69°
22
92°
70°
23
92°
69°
24
90°
69°
25
88°
68°
26
89°
68°
27
89°
67°
28
90°
66°
29
91°
67°
30
90°
66°
31
90°
66°
1
89°
65°
2
90°
66°
3
89°
65°
4
89°
64°
5
88°
66°
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 74° to 94°, with overnight lows between 62° and 72°. The average high for August is 89° with an average low of 67°. 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.
