S
M
T
W
T
F
S
30
77°
56°
31
78°
55°
1
75°
56°
2
77°
59°
3
76°
57°
4
77°
55°
5
77°
54°
6
76°
55°
7
75°
52°
8
76°
53°
9
74°
60°
10
75°
53°
11
74°
52°
12
74°
52°
13
75°
58°
14
78°
55°
15
79°
58°
16
80°
58°
17
80°
57°
18
79°
57°
19
78°
54°
20
78°
48°
21
70°
54°
22
70°
55°
23
74°
55°
24
75°
56°
25
76°
51°
26
74°
46°
27
70°
46°
28
67°
47°
29
67°
47°
30
65°
45°
1
67°
46°
2
65°
43°
3
Hist. Avg.
69°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brilliant
Brilliant's September 2026 forecast shows daily high temperatures ranging from 65° to 80°, with overnight lows between 43° and 60°. The average high for September is 74° with an average low of 53°. 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 Brilliant. See also: October | November | December.
