S
M
T
W
T
F
S
30
86°
59°
31
83°
69°
1
93°
70°
2
78°
70°
3
88°
70°
4
86°
70°
5
81°
60°
6
78°
58°
7
80°
60°
8
83°
61°
9
81°
67°
10
85°
62°
11
76°
58°
12
77°
58°
13
78°
57°
14
80°
58°
15
79°
60°
16
80°
59°
17
82°
54°
18
73°
51°
19
78°
55°
20
80°
58°
21
79°
58°
22
78°
59°
23
73°
57°
24
77°
55°
25
75°
54°
26
78°
57°
27
78°
56°
28
75°
51°
29
68°
49°
30
70°
52°
1
69°
49°
2
68°
51°
3
66°
47°
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 66° to 86°, with overnight lows between 47° and 70°. The average high for September is 77° with an average low of 57°. 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.
