S
M
T
W
T
F
S
30
63°
46°
31
64°
47°
1
67°
57°
2
66°
57°
3
64°
57°
4
66°
48°
5
64°
50°
6
65°
49°
7
70°
47°
8
75°
50°
9
79°
54°
10
67°
57°
11
66°
54°
12
66°
48°
13
66°
49°
14
66°
46°
15
62°
46°
16
58°
48°
17
66°
56°
18
61°
54°
19
62°
51°
20
62°
53°
21
60°
53°
22
62°
50°
23
68°
45°
24
65°
46°
25
62°
55°
26
62°
45°
27
57°
52°
28
60°
43°
29
65°
44°
30
63°
47°
1
65°
51°
2
65°
52°
3
71°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mendocino
Mendocino's September 2026 forecast shows daily high temperatures ranging from 65° to 71°, with overnight lows between 51° and 55°. The average high for September is 67° with an average low of 53°. 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 Mendocino. See also: October | November | December.
