S
M
T
W
T
F
S
30
94°
69°
31
93°
70°
1
93°
69°
2
92°
67°
3
91°
66°
4
91°
67°
5
90°
66°
6
91°
65°
7
90°
66°
8
87°
65°
9
89°
67°
10
90°
66°
11
90°
65°
12
85°
65°
13
83°
64°
14
83°
64°
15
84°
63°
16
83°
64°
17
83°
63°
18
82°
61°
19
82°
57°
20
81°
55°
21
80°
56°
22
81°
60°
23
84°
62°
24
83°
61°
25
85°
62°
26
84°
60°
27
85°
60°
28
80°
59°
29
84°
57°
30
78°
59°
1
Hist. Avg.
81°
55°
2
Hist. Avg.
81°
54°
3
Hist. Avg.
80°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lanark
Lanark's September 2026 forecast shows daily high temperatures ranging from 78° to 94°, with overnight lows between 55° and 70°. The average high for September is 86° 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 Lanark. See also: October | November | December.
