S
M
T
W
T
F
S
30
91°
66°
31
91°
68°
1
92°
69°
2
90°
67°
3
91°
66°
4
90°
66°
5
95°
71°
6
95°
72°
7
90°
66°
8
Hist. Avg.
98°
71°
9
Hist. Avg.
98°
71°
10
Hist. Avg.
98°
71°
11
Hist. Avg.
98°
70°
12
Hist. Avg.
98°
70°
13
Hist. Avg.
97°
70°
14
Hist. Avg.
97°
70°
15
Hist. Avg.
97°
69°
16
Hist. Avg.
97°
69°
17
Hist. Avg.
96°
69°
18
Hist. Avg.
96°
68°
19
Hist. Avg.
96°
68°
20
Hist. Avg.
96°
68°
21
Hist. Avg.
95°
67°
22
Hist. Avg.
95°
67°
23
Hist. Avg.
95°
66°
24
Hist. Avg.
94°
66°
25
Hist. Avg.
94°
66°
26
Hist. Avg.
94°
65°
27
Hist. Avg.
94°
65°
28
Hist. Avg.
93°
64°
29
Hist. Avg.
93°
64°
30
Hist. Avg.
92°
64°
1
Hist. Avg.
92°
63°
2
Hist. Avg.
92°
63°
3
Hist. Avg.
92°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Manuel
San Manuel's September 2026 forecast shows daily high temperatures ranging from 90° to 95°, with overnight lows between 66° and 72°. The average high for September is 92° with an average low of 68°. 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 San Manuel. See also: October | November | December.
