S
M
T
W
T
F
S
30
86°
59°
31
83°
69°
1
93°
70°
2
78°
70°
3
89°
69°
4
88°
70°
5
83°
63°
6
81°
59°
7
80°
56°
8
85°
54°
9
90°
62°
10
88°
70°
11
82°
63°
12
80°
59°
13
85°
69°
14
77°
55°
15
75°
55°
16
83°
65°
17
84°
69°
18
83°
58°
19
76°
62°
20
75°
60°
21
70°
59°
22
71°
58°
23
72°
59°
24
73°
56°
25
72°
54°
26
74°
56°
27
73°
53°
28
72°
51°
29
77°
54°
30
71°
52°
1
70°
54°
2
71°
54°
3
75°
50°
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 70° to 84°, with overnight lows between 50° and 69°. The average high for September is 75° 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.
