S
M
T
W
T
F
S
26
52°
34°
27
48°
33°
28
41°
33°
29
60°
35°
30
62°
42°
1
64°
43°
2
70°
47°
3
73°
54°
4
69°
49°
5
65°
45°
6
57°
41°
7
55°
37°
8
49°
39°
9
65°
39°
10
53°
40°
11
66°
40°
12
70°
46°
13
35°
31°
14
39°
30°
15
35°
27°
16
35°
21°
17
42°
27°
18
50°
31°
19
52°
33°
20
57°
37°
21
62°
35°
22
52°
35°
23
52°
33°
24
50°
32°
25
50°
33°
26
51°
34°
27
52°
36°
28
46°
35°
29
46°
31°
30
49°
31°
31
54°
36°
1
55°
38°
2
47°
37°
3
46°
32°
4
46°
32°
5
47°
34°
6
46°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mount Rainier
Mount Rainier's May 2026 forecast shows daily high temperatures ranging from 35° to 62°, with overnight lows between 21° and 38°. The average high for May is 48° with an average low of 33°. 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 Mount Rainier. See also: June | July | August.
