S
M
T
W
T
F
S
30
81°
59°
31
81°
59°
1
80°
60°
2
80°
63°
3
81°
64°
4
81°
60°
5
84°
60°
6
81°
59°
7
80°
58°
8
81°
57°
9
80°
58°
10
79°
61°
11
82°
57°
12
79°
56°
13
78°
56°
14
79°
57°
15
80°
61°
16
83°
60°
17
80°
55°
18
77°
54°
19
76°
55°
20
77°
58°
21
77°
54°
22
78°
56°
23
81°
57°
24
80°
58°
25
81°
59°
26
80°
51°
27
80°
51°
28
74°
50°
29
74°
49°
30
74°
51°
1
74°
49°
2
72°
48°
3
Hist. Avg.
75°
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 72° to 84°, with overnight lows between 48° and 64°. The average high for September is 79° 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.
