S
M
T
W
T
F
S
30
87°
46°
31
83°
45°
1
82°
52°
2
92°
50°
3
88°
61°
4
95°
61°
5
90°
59°
6
97°
57°
7
89°
48°
8
80°
45°
9
81°
44°
10
88°
45°
11
76°
50°
12
73°
50°
13
80°
43°
14
70°
46°
15
71°
34°
16
77°
46°
17
72°
45°
18
80°
53°
19
65°
48°
20
59°
52°
21
67°
53°
22
77°
56°
23
77°
50°
24
79°
54°
25
79°
54°
26
76°
45°
27
76°
51°
28
68°
50°
29
70°
45°
30
78°
47°
1
71°
45°
2
66°
42°
3
70°
44°
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 66° to 79°, with overnight lows between 42° and 56°. The average high for September is 74° with an average low of 49°. 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.
