S
M
T
W
T
F
S
31
88°
66°
1
86°
67°
2
87°
69°
3
86°
69°
4
83°
67°
5
79°
66°
6
81°
64°
7
89°
67°
8
85°
65°
9
76°
66°
10
75°
66°
11
76°
66°
12
74°
65°
13
74°
65°
14
77°
65°
15
82°
66°
16
90°
65°
17
86°
69°
18
83°
68°
19
82°
68°
20
79°
66°
21
78°
64°
22
86°
67°
23
86°
66°
24
83°
67°
25
77°
65°
26
73°
66°
27
74°
65°
28
76°
64°
29
76°
61°
30
74°
63°
1
76°
60°
2
76°
60°
3
73°
61°
4
73°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Serra Mesa
Serra Mesa's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Serra Mesa. See also: October | November | December.
