S
M
T
W
T
F
S
30
91°
77°
31
94°
77°
1
94°
76°
2
93°
78°
3
94°
78°
4
92°
77°
5
93°
78°
6
94°
78°
7
94°
79°
8
93°
78°
9
93°
78°
10
92°
77°
11
93°
77°
12
93°
76°
13
91°
77°
14
92°
77°
15
91°
76°
16
92°
77°
17
92°
77°
18
91°
76°
19
92°
77°
20
92°
73°
21
91°
71°
22
88°
71°
23
86°
72°
24
87°
72°
25
87°
73°
26
88°
75°
27
91°
75°
28
91°
76°
29
90°
76°
30
91°
74°
1
90°
75°
2
90°
73°
3
89°
72°
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 86° to 94°, with overnight lows between 71° and 79°. The average high for September is 91° with an average low of 76°. 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.
