S
M
T
W
T
F
S
30
88°
64°
31
85°
65°
1
93°
69°
2
96°
68°
3
87°
68°
4
94°
67°
5
81°
65°
6
80°
60°
7
81°
56°
8
85°
56°
9
90°
59°
10
88°
69°
11
79°
68°
12
82°
68°
13
88°
68°
14
79°
57°
15
80°
50°
16
90°
55°
17
91°
64°
18
83°
66°
19
81°
66°
20
80°
67°
21
68°
63°
22
64°
57°
23
57°
54°
24
63°
45°
25
72°
39°
26
N/A
27
74°
53°
28
74°
55°
29
71°
52°
30
80°
57°
1
85°
57°
2
86°
61°
3
63°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lost River State Park
Lost River State Park's September 2026 forecast shows daily high temperatures ranging from 63° to 86°, with overnight lows between 52° and 61°. The average high for September is 77° with an average low of 56°. 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.
