S
M
T
W
T
F
S
30
69°
41°
31
68°
41°
1
64°
39°
2
65°
41°
3
66°
40°
4
66°
40°
5
65°
39°
6
65°
41°
7
68°
40°
8
69°
43°
9
69°
41°
10
60°
36°
11
58°
39°
12
65°
41°
13
66°
42°
14
68°
41°
15
67°
40°
16
66°
36°
17
59°
37°
18
66°
41°
19
60°
36°
20
65°
38°
21
59°
39°
22
Hist. Avg.
82°
50°
23
Hist. Avg.
82°
49°
24
Hist. Avg.
82°
49°
25
Hist. Avg.
81°
48°
26
Hist. Avg.
81°
48°
27
Hist. Avg.
80°
48°
28
Hist. Avg.
80°
48°
29
Hist. Avg.
80°
47°
30
Hist. Avg.
79°
47°
1
Hist. Avg.
79°
46°
2
Hist. Avg.
78°
46°
3
Hist. Avg.
78°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Crater Lake
Crater Lake's September 2026 forecast shows daily high temperatures ranging from 58° to 69°, with overnight lows between 36° and 43°. The average high for September is 65° with an average low of 40°. 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.
