S
M
T
W
T
F
S
30
101°
77°
31
101°
78°
1
98°
75°
2
93°
75°
3
88°
74°
4
96°
73°
5
97°
76°
6
100°
77°
7
100°
76°
8
101°
77°
9
100°
76°
10
96°
74°
11
96°
73°
12
93°
71°
13
92°
72°
14
89°
68°
15
93°
72°
16
92°
71°
17
93°
72°
18
92°
72°
19
92°
71°
20
91°
71°
21
91°
70°
22
88°
70°
23
88°
69°
24
90°
70°
25
90°
69°
26
89°
68°
27
90°
69°
28
91°
69°
29
90°
68°
30
90°
68°
1
89°
68°
2
88°
68°
3
88°
68°
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 88° to 101°, with overnight lows between 68° and 77°. The average high for September is 93° with an average low of 72°. 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.
