S
M
T
W
T
F
S
30
82°
60°
31
83°
60°
1
82°
57°
2
77°
52°
3
75°
52°
4
75°
53°
5
76°
51°
6
80°
56°
7
82°
58°
8
82°
58°
9
81°
57°
10
83°
58°
11
82°
57°
12
83°
58°
13
82°
58°
14
83°
54°
15
73°
50°
16
71°
48°
17
72°
49°
18
71°
47°
19
72°
44°
20
71°
45°
21
78°
47°
22
79°
49°
23
79°
44°
24
78°
43°
25
70°
43°
26
73°
47°
27
75°
51°
28
77°
50°
29
72°
41°
30
68°
40°
1
68°
45°
2
72°
44°
3
75°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lost River State Park
Lost River State Park's September 2026 forecast shows daily high temperatures ranging from 68° to 83°, with overnight lows between 40° and 60°. The average high for September is 77° with an average low of 51°. 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 Lost River State Park. See also: October | November | December.
