S
M
T
W
T
F
S
30
Hist. Avg.
82°
50°
31
Hist. Avg.
82°
50°
1
Hist. Avg.
82°
49°
2
Hist. Avg.
82°
49°
3
Hist. Avg.
82°
49°
4
Hist. Avg.
81°
49°
5
Hist. Avg.
81°
48°
6
Hist. Avg.
81°
48°
7
Hist. Avg.
81°
48°
8
Hist. Avg.
80°
48°
9
Hist. Avg.
80°
47°
10
Hist. Avg.
80°
47°
11
Hist. Avg.
80°
47°
12
Hist. Avg.
79°
46°
13
Hist. Avg.
79°
46°
14
Hist. Avg.
79°
46°
15
Hist. Avg.
78°
45°
16
Hist. Avg.
78°
45°
17
Hist. Avg.
78°
45°
18
Hist. Avg.
78°
44°
19
Hist. Avg.
77°
44°
20
Hist. Avg.
77°
43°
21
Hist. Avg.
77°
43°
22
Hist. Avg.
76°
42°
23
Hist. Avg.
76°
42°
24
Hist. Avg.
76°
42°
25
Hist. Avg.
75°
41°
26
Hist. Avg.
75°
41°
27
Hist. Avg.
74°
40°
28
Hist. Avg.
74°
40°
29
Hist. Avg.
74°
39°
30
Hist. Avg.
73°
39°
1
Hist. Avg.
73°
38°
2
Hist. Avg.
73°
38°
3
Hist. Avg.
72°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Vallecito
Vallecito's September 2026 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 Vallecito. See also: October | November | December.
