S
M
T
W
T
F
S
30
77°
55°
31
76°
59°
1
77°
61°
2
79°
61°
3
84°
62°
4
82°
61°
5
81°
60°
6
84°
61°
7
79°
60°
8
77°
59°
9
76°
59°
10
78°
60°
11
77°
59°
12
74°
58°
13
75°
56°
14
78°
57°
15
77°
57°
16
78°
56°
17
79°
57°
18
78°
58°
19
76°
57°
20
80°
55°
21
79°
55°
22
80°
49°
23
79°
48°
24
71°
52°
25
77°
50°
26
74°
53°
27
78°
55°
28
78°
54°
29
80°
54°
30
81°
55°
1
79°
53°
2
79°
52°
3
76°
51°
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 71° to 84°, with overnight lows between 48° and 62°. The average high for September is 78° 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.
