S
M
T
W
T
F
S
26
76°
46°
27
70°
53°
28
64°
48°
29
59°
38°
30
58°
33°
1
55°
34°
2
59°
37°
3
69°
42°
4
80°
42°
5
55°
43°
6
57°
36°
7
64°
32°
8
68°
44°
9
78°
48°
10
67°
40°
11
69°
39°
12
81°
47°
13
70°
44°
14
74°
40°
15
79°
53°
16
80°
60°
17
84°
65°
18
74°
63°
19
72°
52°
20
68°
45°
21
71°
45°
22
68°
55°
23
78°
58°
24
80°
57°
25
82°
52°
26
83°
52°
27
89°
54°
28
86°
64°
29
83°
54°
30
85°
58°
31
77°
61°
1
83°
55°
2
86°
53°
3
83°
55°
4
85°
63°
5
84°
65°
6
80°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Galesburg
Galesburg's May 2026 forecast shows daily high temperatures ranging from 77° to 86°, with overnight lows between 53° and 65°. The average high for May is 83° 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 Galesburg. See also: June | July | August.
