S
M
T
W
T
F
S
26
86°
69°
27
82°
69°
28
82°
66°
29
83°
69°
30
88°
70°
31
87°
69°
1
84°
69°
2
84°
68°
3
88°
61°
4
82°
62°
5
82°
63°
6
81°
62°
7
83°
61°
8
82°
60°
9
82°
61°
10
83°
65°
11
85°
64°
12
84°
63°
13
88°
60°
14
81°
60°
15
81°
64°
16
82°
62°
17
82°
60°
18
81°
60°
19
80°
58°
20
81°
60°
21
83°
64°
22
85°
66°
23
87°
66°
24
87°
65°
25
86°
62°
26
87°
63°
27
86°
64°
28
83°
63°
29
82°
58°
30
84°
56°
31
79°
54°
1
78°
56°
2
77°
58°
3
78°
59°
4
78°
55°
5
82°
55°
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 77° to 88°, with overnight lows between 54° and 70°. The average high for August is 83° with an average low of 62°. 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.
