S
M
T
W
T
F
S
30
99°
71°
31
100°
73°
1
98°
75°
2
99°
77°
3
99°
76°
4
99°
74°
5
101°
75°
6
101°
73°
7
97°
76°
8
100°
74°
9
100°
72°
10
81°
66°
11
87°
69°
12
91°
70°
13
95°
74°
14
94°
69°
15
83°
66°
16
85°
69°
17
87°
65°
18
77°
56°
19
76°
57°
20
77°
57°
21
75°
56°
22
80°
57°
23
84°
65°
24
85°
65°
25
85°
64°
26
85°
63°
27
84°
64°
28
84°
63°
29
81°
62°
30
82°
60°
1
81°
58°
2
82°
61°
3
83°
61°
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 100°, with overnight lows between 56° and 74°. The average high for September is 84° with an average low of 64°. 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.
