S
M
T
W
T
F
S
30
79°
51°
31
77°
52°
1
71°
55°
2
71°
51°
3
74°
48°
4
77°
55°
5
78°
54°
6
78°
48°
7
72°
46°
8
70°
45°
9
71°
48°
10
75°
49°
11
75°
51°
12
74°
51°
13
67°
46°
14
68°
52°
15
73°
51°
16
74°
46°
17
73°
43°
18
66°
42°
19
65°
43°
20
66°
49°
21
64°
48°
22
65°
43°
23
64°
47°
24
64°
45°
25
65°
48°
26
70°
49°
27
71°
44°
28
70°
42°
29
66°
47°
30
63°
46°
1
62°
47°
2
63°
44°
3
62°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Monterey
Monterey's September 2026 forecast shows daily high temperatures ranging from 62° to 79°, with overnight lows between 39° and 55°. The average high for September is 70° with an average low of 48°. 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 Monterey. See also: October | November | December.
