S
M
T
W
T
F
S
30
90°
68°
31
90°
68°
1
89°
67°
2
91°
68°
3
90°
68°
4
88°
66°
5
86°
65°
6
88°
65°
7
89°
67°
8
90°
67°
9
90°
66°
10
89°
67°
11
90°
67°
12
89°
66°
13
89°
66°
14
87°
64°
15
89°
65°
16
88°
63°
17
89°
64°
18
86°
62°
19
88°
62°
20
88°
60°
21
87°
61°
22
87°
62°
23
86°
61°
24
84°
61°
25
84°
60°
26
83°
60°
27
84°
59°
28
81°
59°
29
84°
58°
30
84°
58°
1
83°
57°
2
80°
49°
3
76°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Folsom
Folsom's September 2026 forecast shows daily high temperatures ranging from 76° to 91°, with overnight lows between 48° and 68°. The average high for September is 87° with an average low of 63°. 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 Folsom. See also: October | November | December.
