S
M
T
W
T
F
S
30
83°
57°
31
84°
62°
1
84°
62°
2
82°
56°
3
81°
52°
4
75°
52°
5
75°
56°
6
76°
60°
7
81°
58°
8
80°
54°
9
76°
53°
10
75°
59°
11
76°
58°
12
82°
59°
13
81°
59°
14
82°
58°
15
81°
55°
16
79°
56°
17
72°
49°
18
76°
48°
19
71°
46°
20
70°
45°
21
68°
46°
22
69°
54°
23
70°
47°
24
72°
46°
25
69°
53°
26
73°
52°
27
70°
53°
28
76°
51°
29
77°
47°
30
74°
46°
1
69°
51°
2
73°
50°
3
69°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ottawa Lake
Ottawa Lake's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 45° and 62°. The average high for September is 76° with an average low of 53°. 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 Ottawa Lake. See also: October | November | December.
