S
M
T
W
T
F
S
26
67°
30°
27
73°
31°
28
55°
42°
29
55°
36°
30
44°
29°
1
46°
28°
2
45°
29°
3
56°
30°
4
67°
40°
5
57°
35°
6
53°
31°
7
44°
37°
8
51°
32°
9
63°
32°
10
51°
37°
11
47°
34°
12
56°
34°
13
46°
40°
14
63°
38°
15
70°
33°
16
70°
42°
17
64°
44°
18
83°
46°
19
72°
48°
20
61°
35°
21
59°
32°
22
69°
32°
23
67°
38°
24
56°
50°
25
75°
52°
26
81°
49°
27
71°
44°
28
67°
45°
29
67°
42°
30
68°
43°
31
69°
43°
1
70°
45°
2
71°
46°
3
75°
50°
4
73°
49°
5
75°
48°
6
73°
46°
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 56° to 81°, with overnight lows between 42° and 52°. The average high for May is 71° with an average low of 47°. 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.
