S
M
T
W
T
F
S
30
79°
50°
31
79°
51°
1
80°
50°
2
79°
50°
3
78°
49°
4
77°
49°
5
78°
50°
6
78°
49°
7
81°
49°
8
81°
49°
9
80°
51°
10
79°
50°
11
78°
47°
12
79°
48°
13
79°
49°
14
80°
52°
15
81°
51°
16
84°
52°
17
81°
54°
18
85°
55°
19
85°
55°
20
86°
54°
21
86°
53°
22
78°
52°
23
75°
52°
24
81°
47°
25
79°
47°
26
78°
49°
27
80°
50°
28
81°
51°
29
81°
49°
30
82°
50°
1
80°
52°
2
79°
51°
3
80°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Idyllwild
Idyllwild's September 2026 forecast shows daily high temperatures ranging from 75° to 86°, with overnight lows between 47° and 55°. The average high for September is 80° with an average low of 51°. 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 Idyllwild. See also: October | November | December.
