S
M
T
W
T
F
S
28
77°
72°
29
84°
66°
30
86°
63°
1
90°
75°
2
99°
75°
3
99°
77°
4
100°
75°
5
93°
73°
6
86°
73°
7
82°
70°
8
83°
68°
9
87°
72°
10
92°
73°
11
85°
68°
12
83°
63°
13
87°
67°
14
88°
66°
15
91°
68°
16
90°
70°
17
90°
67°
18
86°
69°
19
87°
68°
20
84°
67°
21
82°
64°
22
83°
65°
23
84°
65°
24
84°
66°
25
85°
66°
26
86°
70°
27
87°
70°
28
89°
71°
29
88°
70°
30
89°
71°
31
88°
70°
1
89°
69°
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 92°, with overnight lows between 63° and 73°. The average high for July is 87° with an average low of 68°. 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.
