S
M
T
W
T
F
S
30
77°
53°
31
85°
47°
1
79°
52°
2
84°
53°
3
85°
51°
4
76°
50°
5
74°
50°
6
79°
49°
7
82°
51°
8
79°
43°
9
79°
41°
10
71°
39°
11
70°
40°
12
69°
46°
13
71°
42°
14
70°
38°
15
68°
38°
16
67°
38°
17
67°
36°
18
68°
35°
19
65°
37°
20
66°
37°
21
67°
40°
22
72°
43°
23
74°
44°
24
72°
43°
25
74°
40°
26
73°
41°
27
67°
37°
28
72°
34°
29
63°
33°
30
61°
42°
1
63°
39°
2
62°
43°
3
71°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gillette South
Gillette South's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, with overnight lows between 30° and 53°. The average high for September is 72° with an average low of 42°. 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 Gillette South. See also: October | November | December.
