S
M
T
W
T
F
S
30
90°
68°
31
91°
69°
1
91°
69°
2
90°
68°
3
91°
68°
4
92°
69°
5
91°
68°
6
90°
65°
7
89°
61°
8
80°
65°
9
81°
67°
10
80°
66°
11
87°
65°
12
86°
66°
13
88°
65°
14
87°
59°
15
85°
62°
16
76°
56°
17
77°
56°
18
78°
60°
19
80°
54°
20
76°
54°
21
75°
55°
22
76°
59°
23
80°
60°
24
83°
62°
25
83°
62°
26
84°
61°
27
83°
60°
28
81°
56°
29
80°
57°
30
79°
56°
1
80°
54°
2
82°
57°
3
82°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Stockton
Stockton's September 2026 forecast shows daily high temperatures ranging from 75° to 92°, with overnight lows between 54° and 69°. The average high for September is 84° 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 September weather will actually feel in Stockton. See also: October | November | December.
