S
M
T
W
T
F
S
26
84°
68°
27
87°
65°
28
83°
71°
29
80°
62°
30
83°
57°
31
87°
61°
1
80°
65°
2
84°
71°
3
82°
66°
4
86°
61°
5
85°
69°
6
89°
68°
7
83°
70°
8
87°
66°
9
92°
69°
10
90°
71°
11
90°
70°
12
86°
69°
13
81°
66°
14
82°
64°
15
82°
63°
16
83°
64°
17
84°
64°
18
83°
65°
19
84°
62°
20
89°
65°
21
88°
65°
22
88°
66°
23
90°
67°
24
89°
66°
25
87°
66°
26
86°
65°
27
87°
65°
28
85°
64°
29
83°
63°
30
85°
64°
31
86°
64°
1
87°
63°
2
84°
59°
3
81°
58°
4
83°
59°
5
84°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rio Grande
Rio Grande's August 2026 forecast shows daily high temperatures ranging from 81° to 92°, with overnight lows between 58° and 71°. The average high for August is 86° with an average low of 65°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Rio Grande. See also: September | October | November.
