S
M
T
W
T
F
S
30
84°
66°
31
84°
66°
1
85°
65°
2
84°
65°
3
84°
67°
4
83°
66°
5
84°
64°
6
84°
58°
7
79°
56°
8
76°
59°
9
78°
59°
10
80°
62°
11
82°
61°
12
83°
63°
13
82°
65°
14
85°
64°
15
85°
62°
16
83°
61°
17
82°
63°
18
81°
64°
19
83°
63°
20
83°
59°
21
81°
63°
22
78°
62°
23
74°
58°
24
75°
62°
25
76°
61°
26
78°
59°
27
77°
59°
28
77°
61°
29
78°
56°
30
75°
61°
1
75°
63°
2
83°
62°
3
76°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Vista
Vista's September 2026 forecast shows daily high temperatures ranging from 74° to 85°, with overnight lows between 56° and 67°. The average high for September is 80° 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 Vista. See also: October | November | December.
