S
M
T
W
T
F
S
30
92°
71°
31
92°
70°
1
91°
72°
2
90°
71°
3
87°
68°
4
87°
69°
5
86°
71°
6
86°
69°
7
87°
69°
8
88°
71°
9
91°
70°
10
88°
70°
11
90°
69°
12
88°
70°
13
90°
69°
14
90°
64°
15
86°
64°
16
85°
65°
17
84°
64°
18
86°
67°
19
88°
68°
20
89°
67°
21
88°
68°
22
85°
67°
23
85°
67°
24
83°
66°
25
83°
66°
26
85°
64°
27
86°
66°
28
86°
65°
29
87°
65°
30
87°
64°
1
86°
64°
2
86°
63°
3
84°
60°
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 83° to 92°, with overnight lows between 60° and 72°. The average high for September is 87° with an average low of 67°. 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.
