S
M
T
W
T
F
S
30
76°
54°
31
76°
56°
1
77°
61°
2
78°
61°
3
79°
60°
4
77°
61°
5
82°
61°
6
83°
62°
7
82°
61°
8
81°
60°
9
78°
59°
10
78°
60°
11
79°
60°
12
77°
59°
13
72°
58°
14
74°
57°
15
73°
58°
16
72°
57°
17
73°
57°
18
76°
56°
19
75°
57°
20
76°
55°
21
80°
56°
22
80°
46°
23
75°
45°
24
70°
49°
25
71°
50°
26
67°
55°
27
75°
53°
28
73°
54°
29
78°
53°
30
78°
53°
1
77°
52°
2
76°
52°
3
76°
53°
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 67° to 83°, with overnight lows between 45° and 62°. The average high for September is 76° 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 Lock Haven. See also: October | November | December.
