S
M
T
W
T
F
S
30
78°
64°
31
78°
64°
1
82°
65°
2
79°
62°
3
79°
65°
4
80°
65°
5
82°
71°
6
85°
71°
7
83°
68°
8
80°
67°
9
78°
66°
10
79°
68°
11
78°
69°
12
79°
68°
13
80°
67°
14
77°
64°
15
81°
68°
16
80°
68°
17
80°
67°
18
78°
64°
19
75°
63°
20
75°
63°
21
76°
65°
22
78°
66°
23
78°
64°
24
75°
62°
25
72°
59°
26
72°
60°
27
71°
59°
28
71°
59°
29
72°
60°
30
72°
61°
1
73°
60°
2
74°
65°
3
79°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chula Vista
Chula Vista's September 2026 forecast shows daily high temperatures ranging from 71° to 85°, with overnight lows between 59° and 71°. The average high for September is 77° 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 Chula Vista. See also: October | November | December.
