S
M
T
W
T
F
S
30
82°
64°
31
82°
63°
1
81°
55°
2
81°
52°
3
79°
59°
4
82°
55°
5
79°
62°
6
81°
68°
7
75°
65°
8
80°
54°
9
69°
48°
10
78°
52°
11
80°
51°
12
67°
44°
13
66°
45°
14
68°
48°
15
72°
50°
16
74°
51°
17
70°
48°
18
67°
43°
19
73°
49°
20
64°
45°
21
68°
49°
22
67°
50°
23
69°
49°
24
63°
47°
25
66°
47°
26
68°
48°
27
68°
48°
28
66°
46°
29
67°
46°
30
60°
45°
1
58°
43°
2
54°
39°
3
53°
39°
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 53° to 81°, with overnight lows between 39° and 68°. The average high for September is 69° with an average low of 49°. 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.
