S
M
T
W
T
F
S
30
88°
48°
31
92°
51°
1
75°
54°
2
60°
52°
3
66°
51°
4
68°
48°
5
75°
48°
6
68°
53°
7
80°
46°
8
90°
50°
9
96°
53°
10
94°
56°
11
87°
53°
12
73°
47°
13
71°
51°
14
80°
42°
15
82°
47°
16
82°
45°
17
69°
48°
18
83°
49°
19
88°
48°
20
92°
49°
21
85°
53°
22
56°
40°
23
58°
44°
24
62°
38°
25
43°
37°
26
49°
33°
27
53°
32°
28
58°
36°
29
59°
37°
30
55°
36°
1
55°
34°
2
56°
34°
3
53°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Crater Lake
Crater Lake's September 2026 forecast shows daily high temperatures ranging from 43° to 62°, with overnight lows between 32° and 44°. The average high for September is 55° with an average low of 36°. 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 Crater Lake. See also: October | November | December.
