S
M
T
W
T
F
S
30
77°
59°
31
79°
60°
1
80°
54°
2
77°
54°
3
77°
55°
4
78°
53°
5
76°
52°
6
78°
58°
7
81°
58°
8
76°
57°
9
81°
58°
10
81°
58°
11
78°
57°
12
80°
57°
13
80°
58°
14
81°
57°
15
81°
56°
16
80°
54°
17
77°
56°
18
72°
57°
19
79°
56°
20
79°
56°
21
78°
48°
22
77°
46°
23
74°
52°
24
70°
53°
25
Hist. Avg.
69°
51°
26
Hist. Avg.
68°
50°
27
Hist. Avg.
68°
50°
28
Hist. Avg.
68°
50°
29
Hist. Avg.
67°
49°
30
Hist. Avg.
67°
49°
1
Hist. Avg.
66°
48°
2
Hist. Avg.
66°
48°
3
Hist. Avg.
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lock Haven
Lock Haven's September 2026 forecast shows daily high temperatures ranging from 70° to 81°, with overnight lows between 46° and 60°. The average high for September is 78° with an average low of 55°. 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.
