S
M
T
W
T
F
S
26
54°
34°
27
52°
33°
28
54°
34°
29
59°
35°
30
61°
36°
1
55°
31°
2
50°
30°
3
49°
27°
4
53°
33°
5
49°
31°
6
50°
34°
7
54°
34°
8
55°
30°
9
50°
28°
10
50°
28°
11
51°
29°
12
53°
30°
13
54°
32°
14
52°
30°
15
51°
31°
16
52°
30°
17
54°
31°
18
56°
35°
19
55°
38°
20
55°
39°
21
56°
34°
22
54°
33°
23
54°
32°
24
56°
32°
25
58°
34°
26
62°
37°
27
64°
38°
28
66°
42°
29
64°
40°
30
65°
39°
31
67°
41°
1
60°
39°
2
63°
44°
3
69°
43°
4
70°
37°
5
63°
38°
6
65°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lassen Volcanic National Park
Lassen Volcanic National Park's May 2026 forecast shows daily high temperatures ranging from 49° to 70°, with overnight lows between 27° and 44°. The average high for May is 57° with an average low of 34°. 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 Lassen Volcanic National Park. See also: June | July | August.
