S
M
T
W
T
F
S
30
95°
65°
31
89°
65°
1
87°
59°
2
85°
50°
3
85°
59°
4
85°
60°
5
90°
52°
6
72°
63°
7
90°
67°
8
94°
66°
9
101°
74°
10
104°
77°
11
100°
76°
12
98°
68°
13
92°
61°
14
94°
62°
15
93°
64°
16
93°
65°
17
94°
63°
18
95°
61°
19
93°
62°
20
90°
56°
21
86°
58°
22
84°
56°
23
84°
57°
24
85°
58°
25
86°
57°
26
86°
56°
27
83°
56°
28
88°
57°
29
89°
57°
30
84°
56°
1
84°
55°
2
88°
56°
3
87°
56°
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 83° to 104°, with overnight lows between 55° and 77°. The average high for September is 91° with an average low of 61°. 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.
