S
M
T
W
T
F
S
27
75°
53°
28
81°
47°
29
92°
49°
30
90°
53°
1
87°
49°
2
88°
52°
3
96°
56°
4
90°
58°
5
87°
58°
6
87°
56°
7
83°
51°
8
79°
54°
9
80°
57°
10
75°
53°
11
76°
52°
12
78°
54°
13
80°
53°
14
79°
56°
15
81°
55°
16
83°
54°
17
75°
50°
18
80°
56°
19
77°
54°
20
76°
53°
21
76°
53°
22
77°
52°
23
76°
53°
24
76°
53°
25
77°
52°
26
76°
53°
27
68°
52°
28
67°
48°
29
66°
49°
30
67°
48°
31
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Mill Valley
Mill Valley's October 2026 forecast shows daily high temperatures ranging from 66° to 90°, with overnight lows between 47° and 58°. The average high for October is 77° 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 October weather will actually feel in Mill Valley. See also: November | December | January.
