S
M
T
W
T
F
S
30
81°
62°
31
86°
64°
1
87°
64°
2
86°
63°
3
86°
60°
4
83°
56°
5
79°
60°
6
84°
63°
7
85°
63°
8
85°
62°
9
79°
61°
10
81°
62°
11
84°
63°
12
85°
62°
13
83°
62°
14
84°
61°
15
84°
62°
16
83°
61°
17
83°
56°
18
79°
53°
19
75°
51°
20
75°
51°
21
74°
50°
22
74°
52°
23
75°
52°
24
79°
51°
25
78°
57°
26
78°
57°
27
78°
56°
28
78°
55°
29
79°
54°
30
78°
54°
1
75°
52°
2
76°
55°
3
71°
49°
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 87°, with overnight lows between 49° and 64°. The average high for September is 80° 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.
