S
M
T
W
T
F
S
26
70°
38°
27
71°
47°
28
71°
46°
29
73°
47°
30
79°
47°
1
82°
46°
2
88°
59°
3
89°
61°
4
90°
62°
5
87°
62°
6
89°
58°
7
82°
58°
8
80°
49°
9
80°
54°
10
83°
54°
11
81°
53°
12
88°
54°
13
72°
53°
14
69°
48°
15
66°
45°
16
66°
46°
17
71°
51°
18
72°
50°
19
76°
51°
20
79°
58°
21
82°
58°
22
76°
52°
23
79°
59°
24
77°
56°
25
77°
56°
26
75°
59°
27
75°
55°
28
78°
56°
29
78°
58°
30
74°
56°
31
81°
61°
1
82°
61°
2
77°
62°
3
75°
57°
4
73°
56°
5
73°
56°
6
74°
55°
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 66° to 82°, with overnight lows between 45° and 62°. The average high for May is 75° with an average low of 55°. 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.
