S
M
T
W
T
F
S
30
87°
60°
31
91°
67°
1
92°
70°
2
94°
69°
3
95°
72°
4
87°
68°
5
84°
68°
6
80°
59°
7
82°
58°
8
86°
59°
9
90°
71°
10
81°
69°
11
81°
62°
12
80°
64°
13
87°
63°
14
73°
52°
15
86°
49°
16
89°
67°
17
86°
69°
18
77°
62°
19
84°
59°
20
82°
68°
21
68°
56°
22
62°
56°
23
64°
56°
24
68°
39°
25
68°
40°
26
71°
42°
27
71°
42°
28
71°
46°
29
73°
54°
30
77°
60°
1
75°
55°
2
74°
51°
3
74°
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 64° to 77°, with overnight lows between 39° and 60°. The average high for September is 71° 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.
