S
M
T
W
T
F
S
30
71°
45°
31
76°
45°
1
70°
44°
2
70°
44°
3
69°
43°
4
69°
40°
5
69°
48°
6
69°
46°
7
76°
51°
8
Hist. Avg.
64°
41°
9
Hist. Avg.
64°
40°
10
Hist. Avg.
63°
40°
11
Hist. Avg.
63°
40°
12
Hist. Avg.
63°
40°
13
Hist. Avg.
62°
39°
14
Hist. Avg.
62°
39°
15
Hist. Avg.
62°
39°
16
Hist. Avg.
61°
39°
17
Hist. Avg.
61°
38°
18
Hist. Avg.
61°
38°
19
Hist. Avg.
60°
38°
20
Hist. Avg.
60°
38°
21
Hist. Avg.
60°
37°
22
Hist. Avg.
60°
37°
23
Hist. Avg.
59°
37°
24
Hist. Avg.
59°
37°
25
Hist. Avg.
59°
37°
26
Hist. Avg.
58°
36°
27
Hist. Avg.
58°
36°
28
Hist. Avg.
58°
36°
29
Hist. Avg.
57°
36°
30
Hist. Avg.
57°
36°
1
Hist. Avg.
57°
35°
2
Hist. Avg.
56°
35°
3
Hist. Avg.
56°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Williams Lake
Williams Lake's September 2026 forecast shows daily high temperatures ranging from 69° to 76°, with overnight lows between 40° and 51°. The average high for September is 71° with an average low of 45°. 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 Williams Lake. See also: October | November | December.
