S
M
T
W
T
F
S
30
74°
64°
31
73°
65°
1
85°
69°
2
87°
68°
3
83°
68°
4
79°
63°
5
76°
58°
6
74°
52°
7
75°
50°
8
80°
51°
9
85°
61°
10
76°
51°
11
72°
49°
12
79°
64°
13
77°
53°
14
71°
54°
15
76°
58°
16
71°
53°
17
68°
52°
18
64°
48°
19
66°
50°
20
65°
49°
21
64°
49°
22
67°
50°
23
66°
46°
24
66°
52°
25
60°
46°
26
65°
50°
27
69°
50°
28
67°
48°
29
63°
46°
30
66°
51°
1
69°
49°
2
62°
48°
3
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Letchworth State Park
Letchworth State Park's September 2026 forecast shows daily high temperatures ranging from 60° to 79°, with overnight lows between 46° and 64°. The average high for September is 68° 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 Letchworth State Park. See also: October | November | December.
