S
M
T
W
T
F
S
26
61°
52°
27
65°
50°
28
60°
48°
29
63°
52°
30
62°
53°
31
64°
53°
1
60°
51°
2
60°
53°
3
65°
53°
4
62°
50°
5
60°
52°
6
62°
56°
7
62°
53°
8
65°
52°
9
63°
49°
10
64°
52°
11
65°
52°
12
65°
48°
13
70°
50°
14
78°
51°
15
78°
52°
16
69°
54°
17
59°
53°
18
63°
51°
19
64°
53°
20
63°
52°
21
62°
53°
22
63°
53°
23
61°
50°
24
62°
51°
25
62°
52°
26
63°
50°
27
60°
48°
28
58°
51°
29
57°
52°
30
56°
49°
31
56°
48°
1
57°
47°
2
55°
47°
3
55°
49°
4
56°
49°
5
55°
48°
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 55° to 78°, with overnight lows between 47° and 54°. The average high for August is 61° with an average low of 51°. 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.
