S
M
T
W
T
F
S
30
81°
61°
31
83°
61°
1
85°
60°
2
80°
56°
3
77°
55°
4
80°
57°
5
83°
57°
6
84°
59°
7
85°
60°
8
85°
60°
9
84°
59°
10
84°
59°
11
83°
58°
12
85°
60°
13
85°
60°
14
80°
50°
15
72°
51°
16
74°
53°
17
76°
54°
18
82°
56°
19
83°
56°
20
82°
55°
21
77°
50°
22
71°
52°
23
72°
54°
24
70°
54°
25
72°
53°
26
75°
53°
27
79°
52°
28
79°
53°
29
78°
52°
30
79°
52°
1
79°
45°
2
72°
42°
3
65°
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 65° to 85°, with overnight lows between 39° and 61°. The average high for September is 79° with an average low of 55°. 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.
