S
M
T
W
T
F
S
30
80°
59°
31
85°
58°
1
81°
58°
2
80°
57°
3
84°
59°
4
87°
59°
5
87°
58°
6
88°
59°
7
88°
58°
8
89°
59°
9
89°
58°
10
87°
57°
11
88°
54°
12
89°
55°
13
87°
58°
14
88°
54°
15
89°
46°
16
78°
42°
17
73°
47°
18
75°
51°
19
81°
51°
20
73°
50°
21
84°
49°
22
84°
49°
23
82°
46°
24
79°
45°
25
80°
44°
26
80°
38°
27
71°
37°
28
69°
42°
29
79°
48°
30
78°
42°
1
83°
31°
2
75°
33°
3
65°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Imperial
Imperial's September 2026 forecast shows daily high temperatures ranging from 65° to 89°, with overnight lows between 31° and 59°. The average high for September is 82° 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 Imperial. See also: October | November | December.
