S
M
T
W
T
F
S
30
90°
64°
31
92°
68°
1
94°
71°
2
96°
70°
3
97°
72°
4
94°
73°
5
85°
71°
6
82°
63°
7
84°
59°
8
N/A
9
90°
72°
10
77°
65°
11
80°
65°
12
84°
66°
13
88°
66°
14
89°
69°
15
89°
65°
16
81°
57°
17
78°
58°
18
76°
54°
19
74°
50°
20
77°
51°
21
76°
53°
22
77°
58°
23
78°
57°
24
81°
58°
25
82°
59°
26
82°
58°
27
81°
57°
28
82°
58°
29
82°
58°
30
81°
57°
1
81°
57°
2
77°
50°
3
68°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rio Grande
Rio Grande's September 2026 forecast shows daily high temperatures ranging from 68° to 90°, with overnight lows between 44° and 72°. The average high for September is 80° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Rio Grande. See also: October | November | December.
