S
M
T
W
T
F
S
30
77°
51°
31
76°
53°
1
77°
53°
2
76°
48°
3
76°
43°
4
68°
41°
5
67°
50°
6
70°
52°
7
75°
51°
8
74°
48°
9
69°
43°
10
70°
50°
11
73°
51°
12
74°
51°
13
74°
50°
14
73°
49°
15
73°
46°
16
71°
44°
17
68°
44°
18
70°
41°
19
63°
38°
20
62°
36°
21
59°
36°
22
61°
46°
23
63°
43°
24
64°
37°
25
60°
38°
26
62°
46°
27
66°
45°
28
67°
40°
29
68°
39°
30
62°
40°
1
59°
41°
2
65°
37°
3
57°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Riverbank
Riverbank's September 2026 forecast shows daily high temperatures ranging from 57° to 77°, with overnight lows between 35° and 53°. The average high for September is 68° with an average low of 44°. 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 Riverbank. See also: October | November | December.
