S
M
T
W
T
F
S
30
85°
55°
31
86°
53°
1
84°
53°
2
85°
54°
3
86°
56°
4
86°
51°
5
84°
44°
6
77°
49°
7
76°
50°
8
74°
45°
9
74°
48°
10
75°
47°
11
80°
46°
12
75°
45°
13
75°
50°
14
79°
43°
15
81°
38°
16
73°
37°
17
67°
37°
18
67°
38°
19
68°
39°
20
68°
42°
21
74°
46°
22
75°
42°
23
74°
39°
24
66°
37°
25
65°
36°
26
63°
37°
27
64°
36°
28
62°
35°
29
63°
38°
30
66°
40°
1
Hist. Avg.
67°
40°
2
Hist. Avg.
66°
40°
3
Hist. Avg.
66°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gillette
Gillette's September 2026 forecast shows daily high temperatures ranging from 62° to 86°, with overnight lows between 35° and 56°. The average high for September is 74° with an average low of 44°. 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. See also: October | November | December.
