S
M
T
W
T
F
S
28
82°
58°
29
83°
57°
30
83°
58°
1
84°
65°
2
87°
64°
3
93°
64°
4
92°
60°
5
86°
61°
6
90°
60°
7
92°
66°
8
91°
65°
9
92°
60°
10
86°
59°
11
86°
60°
12
87°
64°
13
86°
63°
14
86°
60°
15
87°
60°
16
86°
63°
17
89°
64°
18
87°
60°
19
86°
60°
20
86°
61°
21
87°
66°
22
88°
66°
23
91°
65°
24
90°
66°
25
85°
61°
26
89°
65°
27
90°
66°
28
91°
65°
29
89°
60°
30
87°
64°
31
90°
65°
1
90°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Petersburg
Petersburg's July 2026 forecast shows daily high temperatures ranging from 82° to 93°, with overnight lows between 57° and 66°. The average high for July is 88° 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 July weather will actually feel in Petersburg. See also: August | September | October.
