S
M
T
W
T
F
S
28
78°
69°
29
85°
69°
30
92°
67°
1
96°
70°
2
99°
67°
3
98°
68°
4
96°
69°
5
93°
65°
6
87°
67°
7
82°
70°
8
87°
70°
9
87°
69°
10
77°
67°
11
82°
65°
12
79°
61°
13
83°
61°
14
92°
63°
15
94°
66°
16
94°
68°
17
89°
64°
18
88°
66°
19
85°
64°
20
84°
64°
21
85°
63°
22
85°
64°
23
84°
63°
24
91°
67°
25
89°
66°
26
90°
66°
27
90°
67°
28
89°
67°
29
89°
66°
30
84°
66°
31
85°
65°
1
84°
65°
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 77° to 94°, with overnight lows between 61° and 68°. The average high for July is 87° with an average low of 65°. 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.
