S
M
T
W
T
F
S
26
69°
39°
27
58°
47°
28
58°
47°
29
65°
47°
30
75°
49°
1
72°
53°
2
73°
51°
3
79°
54°
4
78°
53°
5
65°
54°
6
59°
53°
7
65°
51°
8
63°
50°
9
68°
49°
10
67°
51°
11
70°
54°
12
82°
54°
13
61°
53°
14
62°
50°
15
55°
47°
16
58°
45°
17
64°
42°
18
67°
46°
19
65°
52°
20
68°
52°
21
75°
51°
22
78°
53°
23
66°
52°
24
72°
53°
25
61°
51°
26
64°
50°
27
74°
49°
28
79°
52°
29
57°
47°
30
62°
47°
31
66°
50°
1
74°
55°
2
87°
58°
3
71°
51°
4
74°
53°
5
70°
54°
6
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rainier Valley
Rainier Valley's May 2026 forecast shows daily high temperatures ranging from 57° to 87°, with overnight lows between 47° and 58°. The average high for May is 71° with an average low of 52°. 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 Rainier Valley. See also: June | July | August.
