S
M
T
W
T
F
S
26
72°
32°
27
58°
43°
28
57°
48°
29
69°
43°
30
78°
41°
1
76°
44°
2
76°
49°
3
84°
48°
4
79°
50°
5
66°
53°
6
62°
51°
7
66°
50°
8
65°
47°
9
71°
41°
10
69°
46°
11
74°
48°
12
83°
45°
13
60°
51°
14
61°
47°
15
53°
43°
16
60°
44°
17
64°
35°
18
70°
42°
19
65°
46°
20
70°
44°
21
78°
48°
22
75°
48°
23
72°
45°
24
68°
48°
25
58°
41°
26
63°
42°
27
67°
43°
28
66°
43°
29
65°
42°
30
67°
44°
31
72°
47°
1
68°
46°
2
73°
51°
3
73°
50°
4
71°
49°
5
69°
46°
6
72°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rainier
Rainier's May 2026 forecast shows daily high temperatures ranging from 58° to 78°, with overnight lows between 41° and 51°. The average high for May is 69° with an average low of 46°. 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. See also: June | July | August.
