S
M
T
W
T
F
S
30
89°
72°
31
83°
70°
1
82°
66°
2
82°
63°
3
80°
64°
4
80°
63°
5
89°
62°
6
78°
69°
7
92°
74°
8
100°
75°
9
106°
80°
10
94°
79°
11
89°
73°
12
84°
72°
13
85°
71°
14
84°
69°
15
81°
69°
16
80°
68°
17
79°
67°
18
79°
64°
19
82°
64°
20
82°
66°
21
80°
63°
22
84°
60°
23
87°
63°
24
90°
65°
25
91°
67°
26
92°
68°
27
92°
66°
28
91°
65°
29
87°
67°
30
88°
66°
1
89°
65°
2
83°
63°
3
84°
65°
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 80° to 92°, with overnight lows between 60° and 68°. The average high for September is 87° with an average low of 65°. 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.
