S
M
T
W
T
F
S
26
52°
41°
27
63°
41°
28
64°
50°
29
52°
36°
30
46°
32°
1
41°
30°
2
45°
32°
3
64°
47°
4
77°
52°
5
52°
44°
6
48°
37°
7
52°
35°
8
69°
34°
9
69°
48°
10
57°
37°
11
45°
39°
12
70°
35°
13
54°
47°
14
68°
42°
15
77°
50°
16
82°
51°
17
61°
50°
18
81°
65°
19
N/A
20
55°
40°
21
53°
43°
22
59°
48°
23
62°
48°
24
63°
52°
25
74°
52°
26
73°
54°
27
74°
56°
28
75°
56°
29
73°
57°
30
77°
56°
31
73°
54°
1
76°
57°
2
84°
64°
3
77°
60°
4
76°
59°
5
75°
53°
6
69°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Mill Valley
Mill Valley's May 2026 forecast shows daily high temperatures ranging from 53° to 84°, with overnight lows between 40° and 64°. The average high for May is 70° 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 May weather will actually feel in Mill Valley. See also: June | July | August.
