S
M
T
W
T
F
S
26
59°
42°
27
68°
47°
28
64°
50°
29
57°
40°
30
56°
37°
1
50°
35°
2
57°
32°
3
68°
45°
4
80°
51°
5
61°
46°
6
58°
41°
7
60°
37°
8
65°
52°
9
73°
46°
10
63°
44°
11
59°
43°
12
68°
49°
13
56°
44°
14
61°
50°
15
70°
54°
16
75°
55°
17
76°
59°
18
78°
60°
19
78°
59°
20
75°
61°
21
72°
52°
22
64°
47°
23
66°
50°
24
67°
51°
25
67°
50°
26
68°
49°
27
69°
50°
28
70°
51°
29
72°
56°
30
78°
58°
31
78°
59°
1
77°
56°
2
72°
58°
3
79°
61°
4
80°
62°
5
81°
61°
6
72°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in River Grove
River Grove's May 2026 forecast shows daily high temperatures ranging from 56° to 81°, with overnight lows between 43° and 62°. The average high for May is 71° with an average low of 54°. 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 River Grove. See also: June | July | August.
