S
M
T
W
T
F
S
26
59°
50°
27
64°
49°
28
71°
46°
29
75°
47°
30
74°
46°
1
75°
46°
2
64°
50°
3
65°
50°
4
63°
52°
5
66°
54°
6
71°
51°
7
70°
52°
8
74°
52°
9
78°
54°
10
79°
55°
11
75°
54°
12
76°
54°
13
75°
52°
14
74°
53°
15
71°
51°
16
74°
54°
17
75°
53°
18
74°
54°
19
75°
54°
20
76°
53°
21
75°
53°
22
73°
54°
23
76°
55°
24
77°
55°
25
77°
54°
26
76°
52°
27
69°
54°
28
69°
53°
29
70°
54°
30
70°
54°
31
71°
55°
1
73°
55°
2
77°
56°
3
74°
55°
4
71°
54°
5
71°
53°
6
70°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Ross Valley
Ross Valley's May 2026 forecast shows daily high temperatures ranging from 63° to 79°, with overnight lows between 50° and 56°. The average high for May is 73° 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 Ross Valley. See also: June | July | August.
