S
M
T
W
T
F
S
30
72°
49°
31
72°
55°
1
75°
56°
2
70°
58°
3
79°
58°
4
79°
56°
5
78°
52°
6
74°
47°
7
69°
50°
8
75°
53°
9
75°
47°
10
73°
53°
11
71°
47°
12
72°
51°
13
72°
53°
14
76°
48°
15
68°
50°
16
66°
52°
17
65°
51°
18
66°
49°
19
71°
43°
20
66°
49°
21
70°
43°
22
69°
45°
23
69°
42°
24
71°
42°
25
70°
49°
26
71°
49°
27
67°
51°
28
70°
48°
29
71°
40°
30
63°
46°
1
69°
49°
2
70°
45°
3
68°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Treasure Lake
Treasure Lake's September 2026 forecast shows daily high temperatures ranging from 63° to 79°, with overnight lows between 40° and 58°. The average high for September is 71° with an average low of 49°. 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 Treasure Lake. See also: October | November | December.
