S
M
T
W
T
F
S
30
91°
72°
31
95°
75°
1
97°
70°
2
97°
68°
3
95°
72°
4
95°
72°
5
97°
70°
6
86°
72°
7
79°
68°
8
95°
71°
9
79°
64°
10
83°
58°
11
83°
64°
12
81°
61°
13
73°
62°
14
81°
59°
15
73°
55°
16
72°
54°
17
74°
52°
18
70°
52°
19
72°
51°
20
71°
52°
21
74°
51°
22
78°
57°
23
78°
58°
24
77°
58°
25
78°
57°
26
78°
58°
27
77°
57°
28
76°
57°
29
75°
56°
30
73°
55°
1
75°
49°
2
64°
45°
3
62°
42°
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 62° to 95°, with overnight lows between 42° and 71°. 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 Lancaster. See also: October | November | December.
