S
M
T
W
T
F
S
26
70°
46°
27
66°
45°
28
65°
45°
29
67°
46°
30
66°
45°
1
67°
47°
2
66°
45°
3
65°
45°
4
64°
44°
5
65°
42°
6
67°
48°
7
70°
51°
8
68°
46°
9
68°
53°
10
69°
47°
11
68°
46°
12
66°
44°
13
66°
44°
14
68°
47°
15
68°
49°
16
69°
46°
17
70°
56°
18
77°
47°
19
69°
47°
20
70°
48°
21
73°
57°
22
74°
58°
23
78°
59°
24
80°
59°
25
77°
58°
26
81°
60°
27
81°
59°
28
80°
54°
29
83°
58°
30
84°
57°
31
80°
54°
1
79°
55°
2
77°
56°
3
78°
60°
4
84°
60°
5
77°
61°
6
77°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rio Grande
Rio Grande's May 2026 forecast shows daily high temperatures ranging from 64° to 84°, with overnight lows between 42° and 61°. The average high for May is 72° with an average low of 51°. 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 Rio Grande. See also: June | July | August.
