S
M
T
W
T
F
S
30
85°
58°
31
83°
57°
1
82°
58°
2
85°
57°
3
81°
56°
4
73°
55°
5
81°
57°
6
83°
54°
7
72°
51°
8
75°
54°
9
79°
53°
10
80°
54°
11
77°
53°
12
73°
48°
13
65°
42°
14
66°
49°
15
75°
53°
16
78°
49°
17
71°
50°
18
77°
51°
19
76°
54°
20
79°
51°
21
79°
49°
22
78°
49°
23
75°
51°
24
76°
50°
25
76°
50°
26
77°
40°
27
68°
44°
28
70°
46°
29
71°
47°
30
64°
44°
1
60°
46°
2
61°
47°
3
70°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grassy Butte
Grassy Butte's September 2026 forecast shows daily high temperatures ranging from 60° to 85°, with overnight lows between 37° and 58°. The average high for September is 75° with an average low of 50°. 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 Grassy Butte. See also: October | November | December.
