S
M
T
W
T
F
S
30
86°
66°
31
88°
64°
1
88°
63°
2
89°
62°
3
86°
61°
4
85°
62°
5
84°
62°
6
84°
63°
7
86°
64°
8
88°
62°
9
86°
61°
10
85°
61°
11
85°
63°
12
86°
65°
13
88°
66°
14
90°
66°
15
91°
67°
16
91°
69°
17
92°
67°
18
92°
67°
19
90°
66°
20
91°
67°
21
90°
64°
22
89°
62°
23
84°
63°
24
86°
64°
25
90°
67°
26
91°
66°
27
Hist. Avg.
86°
63°
28
Hist. Avg.
86°
62°
29
Hist. Avg.
86°
62°
30
Hist. Avg.
86°
62°
1
Hist. Avg.
86°
62°
2
Hist. Avg.
85°
62°
3
Hist. Avg.
85°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Brea Chem
Brea Chem's September 2026 forecast shows daily high temperatures ranging from 84° to 92°, with overnight lows between 61° and 69°. The average high for September is 88° 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 Brea Chem. See also: October | November | December.
