S
M
T
W
T
F
S
26
52°
34°
27
48°
34°
28
44°
36°
29
58°
31°
30
64°
47°
1
67°
48°
2
71°
46°
3
75°
56°
4
68°
47°
5
61°
46°
6
62°
46°
7
61°
39°
8
56°
39°
9
71°
37°
10
55°
39°
11
69°
34°
12
72°
47°
13
47°
38°
14
48°
38°
15
43°
35°
16
36°
31°
17
39°
30°
18
50°
34°
19
68°
43°
20
71°
47°
21
78°
48°
22
81°
51°
23
79°
50°
24
76°
45°
25
62°
39°
26
67°
40°
27
70°
41°
28
64°
39°
29
66°
40°
30
68°
42°
31
73°
46°
1
71°
44°
2
77°
51°
3
77°
50°
4
76°
49°
5
75°
47°
6
76°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Grass Valley
Grass Valley's May 2026 forecast shows daily high temperatures ranging from 62° to 81°, with overnight lows between 39° and 51°. The average high for May is 72° with an average low of 45°. 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 Grass Valley. See also: June | July | August.
