S
M
T
W
T
F
S
26
51°
33°
27
54°
34°
28
57°
34°
29
50°
33°
30
53°
36°
1
51°
32°
2
54°
33°
3
61°
39°
4
64°
41°
5
63°
34°
6
56°
36°
7
65°
43°
8
68°
45°
9
67°
41°
10
61°
36°
11
57°
40°
12
61°
43°
13
61°
44°
14
63°
44°
15
67°
45°
16
69°
45°
17
69°
47°
18
68°
35°
19
62°
33°
20
59°
33°
21
60°
35°
22
59°
34°
23
60°
35°
24
62°
37°
25
66°
41°
26
70°
38°
27
70°
35°
28
64°
40°
29
65°
43°
30
61°
40°
31
64°
41°
1
62°
38°
2
63°
44°
3
64°
46°
4
72°
50°
5
70°
46°
6
65°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mattawa
Mattawa's May 2026 forecast shows daily high temperatures ranging from 50° to 72°, with overnight lows between 32° and 50°. The average high for May is 62° with an average low of 39°. 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 Mattawa. See also: June | July | August.
