S
M
T
W
T
F
S
26
77°
49°
27
63°
57°
28
64°
53°
29
63°
43°
30
62°
40°
1
56°
43°
2
57°
41°
3
66°
43°
4
74°
54°
5
62°
44°
6
60°
41°
7
63°
38°
8
68°
49°
9
74°
48°
10
69°
48°
11
72°
43°
12
78°
45°
13
70°
47°
14
69°
41°
15
75°
50°
16
75°
64°
17
83°
65°
18
76°
63°
19
81°
61°
20
69°
52°
21
68°
49°
22
67°
54°
23
73°
58°
24
78°
58°
25
81°
53°
26
75°
59°
27
81°
67°
28
83°
59°
29
76°
63°
30
78°
54°
31
77°
60°
1
78°
55°
2
80°
55°
3
80°
60°
4
79°
64°
5
78°
64°
6
82°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mattoon Township
Mattoon Township's May 2026 forecast shows daily high temperatures ranging from 76° to 83°, with overnight lows between 54° and 64°. The average high for May is 79° with an average low of 60°. 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 Mattoon Township. See also: June | July | August.
