S
M
T
W
T
F
S
30
91°
66°
31
90°
68°
1
91°
69°
2
92°
70°
3
90°
69°
4
91°
69°
5
90°
68°
6
84°
68°
7
84°
66°
8
85°
64°
9
85°
62°
10
84°
61°
11
83°
62°
12
84°
61°
13
83°
60°
14
82°
61°
15
82°
60°
16
83°
62°
17
84°
61°
18
83°
60°
19
82°
61°
20
82°
62°
21
84°
66°
22
85°
67°
23
83°
66°
24
80°
61°
25
Hist. Avg.
85°
62°
26
Hist. Avg.
84°
62°
27
Hist. Avg.
84°
62°
28
Hist. Avg.
84°
61°
29
Hist. Avg.
84°
61°
30
Hist. Avg.
84°
61°
1
Hist. Avg.
83°
61°
2
Hist. Avg.
83°
60°
3
Hist. Avg.
83°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Gabriel
San Gabriel's September 2026 forecast shows daily high temperatures ranging from 80° to 92°, with overnight lows between 60° and 70°. The average high for September is 85° 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 San Gabriel. See also: October | November | December.
