S
M
T
W
T
F
S
30
82°
59°
31
75°
56°
1
78°
54°
2
79°
57°
3
80°
61°
4
79°
62°
5
82°
61°
6
81°
64°
7
79°
65°
8
78°
64°
9
81°
62°
10
80°
63°
11
78°
60°
12
81°
64°
13
80°
64°
14
81°
64°
15
81°
64°
16
80°
63°
17
80°
63°
18
78°
61°
19
75°
62°
20
79°
62°
21
80°
61°
22
80°
62°
23
78°
62°
24
76°
57°
25
72°
56°
26
72°
57°
27
71°
55°
28
72°
57°
29
76°
59°
30
75°
59°
1
73°
58°
2
77°
60°
3
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Montecito
Montecito's September 2026 forecast shows daily high temperatures ranging from 71° to 82°, with overnight lows between 54° and 65°. The average high for September is 78° with an average low of 61°. 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 Montecito. See also: October | November | December.
