S
M
T
W
T
F
S
30
69°
44°
31
73°
46°
1
76°
45°
2
70°
54°
3
76°
57°
4
74°
59°
5
70°
53°
6
69°
43°
7
77°
50°
8
75°
43°
9
69°
62°
10
77°
45°
11
66°
39°
12
76°
51°
13
77°
52°
14
72°
48°
15
69°
51°
16
69°
49°
17
68°
46°
18
66°
45°
19
67°
47°
20
65°
44°
21
62°
48°
22
62°
47°
23
65°
48°
24
67°
46°
25
69°
47°
26
69°
44°
27
61°
38°
28
65°
43°
29
69°
46°
30
70°
46°
1
69°
45°
2
68°
46°
3
65°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lancaster
Lancaster's September 2026 forecast shows daily high temperatures ranging from 61° to 77°, with overnight lows between 38° and 62°. The average high for September is 69° with an average low of 47°. 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 Lancaster. See also: October | November | December.
