S
M
T
W
T
F
S
30
87°
71°
31
93°
68°
1
96°
71°
2
99°
73°
3
98°
72°
4
98°
73°
5
99°
70°
6
88°
67°
7
85°
64°
8
87°
64°
9
89°
67°
10
93°
66°
11
94°
65°
12
90°
65°
13
87°
66°
14
86°
66°
15
87°
64°
16
88°
61°
17
79°
65°
18
77°
64°
19
78°
64°
20
78°
65°
21
79°
64°
22
80°
65°
23
82°
64°
24
77°
63°
25
77°
64°
26
80°
63°
27
82°
61°
28
81°
54°
29
74°
53°
30
74°
53°
1
75°
55°
2
75°
60°
3
73°
59°
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 73° to 99°, with overnight lows between 53° and 73°. The average high for September is 84° with an average low of 63°. 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.
