S
M
T
W
T
F
S
30
60°
47°
31
59°
41°
1
59°
41°
2
57°
46°
3
62°
40°
4
67°
32°
5
72°
37°
6
73°
39°
7
71°
41°
8
63°
44°
9
59°
48°
10
51°
44°
11
60°
40°
12
66°
35°
13
64°
42°
14
57°
30°
15
58°
28°
16
62°
36°
17
59°
41°
18
60°
32°
19
62°
48°
20
63°
44°
21
58°
35°
22
54°
28°
23
52°
32°
24
52°
25°
25
51°
26°
26
54°
30°
27
51°
35°
28
50°
31°
29
48°
31°
30
51°
29°
1
47°
30°
2
49°
33°
3
47°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Watson Lake
Watson Lake's September 2026 forecast shows daily high temperatures ranging from 47° to 54°, with overnight lows between 25° and 35°. The average high for September is 50° with an average low of 30°. 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 Watson Lake. See also: October | November | December.
