S
M
T
W
T
F
S
30
81°
57°
31
81°
65°
1
90°
69°
2
83°
68°
3
86°
66°
4
83°
68°
5
80°
60°
6
73°
57°
7
77°
52°
8
81°
51°
9
86°
59°
10
81°
69°
11
81°
61°
12
72°
56°
13
83°
66°
14
72°
52°
15
73°
44°
16
85°
54°
17
83°
67°
18
79°
59°
19
68°
55°
20
71°
62°
21
64°
53°
22
59°
55°
23
65°
48°
24
65°
45°
25
71°
49°
26
74°
57°
27
65°
56°
28
67°
56°
29
71°
52°
30
75°
56°
1
77°
54°
2
76°
55°
3
73°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lock Haven
Lock Haven's September 2026 forecast shows daily high temperatures ranging from 65° to 77°, with overnight lows between 49° and 57°. The average high for September is 72° with an average low of 54°. 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 Lock Haven. See also: October | November | December.
