S
M
T
W
T
F
S
30
83°
65°
31
76°
58°
1
76°
58°
2
77°
59°
3
76°
63°
4
76°
60°
5
75°
59°
6
76°
60°
7
78°
58°
8
80°
59°
9
79°
59°
10
81°
62°
11
81°
63°
12
80°
63°
13
81°
62°
14
80°
62°
15
79°
61°
16
73°
60°
17
74°
56°
18
73°
54°
19
78°
60°
20
78°
57°
21
73°
54°
22
71°
53°
23
74°
55°
24
77°
58°
25
78°
58°
26
77°
57°
27
76°
58°
28
76°
58°
29
75°
58°
30
70°
51°
1
71°
52°
2
65°
49°
3
66°
43°
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 65° to 83°, with overnight lows between 43° and 65°. The average high for September is 76° with an average low of 58°. 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.
