S
M
T
W
T
F
S
30
90°
66°
31
90°
65°
1
89°
65°
2
89°
64°
3
87°
63°
4
88°
63°
5
90°
66°
6
89°
67°
7
89°
65°
8
87°
63°
9
84°
63°
10
85°
64°
11
87°
64°
12
86°
65°
13
87°
63°
14
85°
65°
15
84°
60°
16
86°
59°
17
86°
59°
18
84°
60°
19
83°
61°
20
86°
62°
21
85°
60°
22
84°
58°
23
84°
58°
24
85°
59°
25
82°
59°
26
83°
60°
27
84°
56°
28
83°
55°
29
80°
57°
30
81°
61°
1
84°
62°
2
87°
62°
3
87°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lakeside
Lakeside's September 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 55° and 67°. The average high for September is 86° with an average low of 62°. 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 Lakeside. See also: October | November | December.
