S
M
T
W
T
F
S
30
80°
57°
31
79°
56°
1
79°
57°
2
80°
58°
3
77°
61°
4
79°
57°
5
81°
56°
6
80°
57°
7
78°
55°
8
79°
56°
9
77°
55°
10
77°
57°
11
78°
54°
12
76°
54°
13
77°
53°
14
78°
56°
15
78°
59°
16
81°
58°
17
76°
52°
18
74°
51°
19
74°
52°
20
76°
57°
21
74°
51°
22
73°
53°
23
77°
56°
24
78°
57°
25
78°
56°
26
78°
48°
27
76°
49°
28
70°
48°
29
68°
47°
30
70°
47°
1
70°
48°
2
Hist. Avg.
72°
49°
3
Hist. Avg.
71°
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 68° to 81°, with overnight lows between 47° and 61°. The average high for September is 77° with an average low of 54°. 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.
