S
M
T
W
T
F
S
30
84°
62°
31
84°
63°
1
85°
62°
2
84°
62°
3
83°
61°
4
83°
61°
5
84°
62°
6
84°
62°
7
86°
63°
8
86°
62°
9
85°
62°
10
86°
61°
11
84°
61°
12
86°
62°
13
86°
64°
14
87°
67°
15
89°
65°
16
91°
67°
17
89°
68°
18
92°
68°
19
92°
69°
20
93°
69°
21
93°
67°
22
89°
66°
23
85°
66°
24
89°
62°
25
88°
64°
26
87°
66°
27
89°
66°
28
90°
65°
29
89°
64°
30
90°
65°
1
89°
67°
2
90°
66°
3
89°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brea
Brea's September 2026 forecast shows daily high temperatures ranging from 83° to 93°, with overnight lows between 61° and 69°. The average high for September is 87° 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. See also: October | November | December.
