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
81°
51°
23
79°
44°
24
59°
35°
25
41°
30°
26
49°
35°
27
49°
32°
28
50°
38°
29
61°
35°
30
62°
38°
1
60°
33°
2
56°
34°
3
57°
35°
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 41° to 62°, with overnight lows between 30° and 38°. The average high for September is 54° with an average low of 35°. 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.
