S
M
T
W
T
F
S
26
67°
27°
27
74°
29°
28
66°
32°
29
63°
42°
30
50°
43°
1
57°
37°
2
52°
39°
3
54°
35°
4
63°
41°
5
74°
54°
6
63°
46°
7
55°
39°
8
53°
33°
9
56°
36°
10
58°
42°
11
60°
40°
12
61°
42°
13
58°
41°
14
59°
42°
15
65°
42°
16
62°
41°
17
61°
39°
18
62°
47°
19
63°
47°
20
68°
46°
21
70°
48°
22
71°
46°
23
62°
45°
24
63°
47°
25
64°
44°
26
66°
43°
27
65°
45°
28
64°
47°
29
65°
49°
30
70°
48°
31
67°
46°
1
66°
43°
2
65°
43°
3
66°
44°
4
65°
45°
5
66°
44°
6
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Effingham
Effingham's May 2026 forecast shows daily high temperatures ranging from 52° to 74°, with overnight lows between 33° and 54°. The average high for May is 63° with an average low of 43°. 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 Effingham. See also: June | July | August.
