S
M
T
W
T
F
S
30
94°
69°
31
96°
70°
1
96°
74°
2
95°
71°
3
95°
71°
4
94°
73°
5
95°
73°
6
95°
72°
7
94°
72°
8
95°
73°
9
92°
72°
10
94°
72°
11
93°
71°
12
94°
72°
13
94°
72°
14
93°
70°
15
92°
65°
16
85°
63°
17
84°
69°
18
88°
69°
19
85°
67°
20
84°
66°
21
83°
64°
22
83°
67°
23
87°
67°
24
87°
68°
25
89°
67°
26
89°
67°
27
88°
64°
28
88°
64°
29
87°
65°
30
87°
64°
1
85°
63°
2
87°
66°
3
79°
58°
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 79° to 96°, with overnight lows between 58° and 74°. The average high for September is 90° with an average low of 68°. 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.
