S
M
T
W
T
F
S
30
79°
57°
31
76°
59°
1
76°
54°
2
77°
52°
3
76°
58°
4
81°
61°
5
79°
60°
6
81°
58°
7
82°
59°
8
75°
60°
9
75°
54°
10
78°
52°
11
74°
54°
12
77°
55°
13
76°
54°
14
76°
58°
15
79°
59°
16
80°
59°
17
79°
52°
18
79°
47°
19
71°
47°
20
69°
48°
21
70°
50°
22
76°
56°
23
78°
57°
24
77°
53°
25
78°
45°
26
75°
46°
27
66°
45°
28
65°
44°
29
66°
45°
30
67°
43°
1
Hist. Avg.
69°
47°
2
Hist. Avg.
68°
47°
3
Hist. Avg.
68°
46°
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 82°, with overnight lows between 43° and 61°. The average high for September is 75° with an average low of 53°. 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.
