S
M
T
W
T
F
S
30
85°
54°
31
81°
52°
1
78°
51°
2
78°
53°
3
79°
53°
4
79°
54°
5
77°
54°
6
76°
58°
7
77°
58°
8
82°
53°
9
76°
52°
10
76°
51°
11
75°
51°
12
76°
54°
13
75°
53°
14
74°
50°
15
75°
56°
16
75°
49°
17
77°
50°
18
77°
50°
19
75°
56°
20
75°
51°
21
72°
46°
22
71°
45°
23
Hist. Avg.
75°
50°
24
Hist. Avg.
75°
49°
25
Hist. Avg.
74°
49°
26
Hist. Avg.
74°
48°
27
Hist. Avg.
74°
48°
28
Hist. Avg.
73°
48°
29
Hist. Avg.
73°
47°
30
Hist. Avg.
72°
47°
1
Hist. Avg.
72°
46°
2
Hist. Avg.
72°
46°
3
Hist. Avg.
71°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lancaster
Lancaster's September 2026 forecast shows daily high temperatures ranging from 71° to 85°, with overnight lows between 45° and 58°. The average high for September is 77° with an average low of 52°. 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.
