S
M
T
W
T
F
S
30
86°
63°
31
83°
68°
1
86°
66°
2
87°
63°
3
82°
62°
4
83°
63°
5
82°
64°
6
86°
66°
7
86°
67°
8
85°
66°
9
85°
66°
10
84°
65°
11
86°
66°
12
86°
66°
13
85°
65°
14
85°
64°
15
82°
64°
16
79°
63°
17
83°
59°
18
79°
59°
19
81°
58°
20
82°
63°
21
83°
62°
22
78°
59°
23
82°
61°
24
80°
62°
25
80°
58°
26
82°
57°
27
Hist. Avg.
79°
57°
28
Hist. Avg.
78°
57°
29
Hist. Avg.
78°
56°
30
Hist. Avg.
78°
56°
1
Hist. Avg.
77°
56°
2
Hist. Avg.
77°
55°
3
Hist. Avg.
77°
55°
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 78° to 87°, with overnight lows between 57° and 68°. The average high for September is 83° 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.
