S
M
T
W
T
F
S
30
73°
56°
31
79°
55°
1
77°
60°
2
80°
58°
3
80°
61°
4
75°
57°
5
69°
56°
6
73°
52°
7
78°
51°
8
76°
54°
9
71°
54°
10
74°
54°
11
67°
46°
12
80°
43°
13
80°
62°
14
67°
43°
15
69°
39°
16
79°
53°
17
69°
51°
18
68°
40°
19
63°
40°
20
59°
46°
21
61°
38°
22
62°
39°
23
66°
39°
24
66°
41°
25
68°
45°
26
67°
46°
27
69°
46°
28
70°
47°
29
71°
48°
30
69°
47°
1
65°
48°
2
68°
50°
3
60°
48°
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 59° to 71°, with overnight lows between 38° and 50°. The average high for September is 66° with an average low of 45°. 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.
