S
M
T
W
T
F
S
30
63°
55°
31
66°
52°
1
64°
54°
2
63°
54°
3
66°
57°
4
64°
55°
5
64°
50°
6
63°
52°
7
60°
48°
8
57°
44°
9
58°
47°
10
60°
51°
11
59°
48°
12
59°
51°
13
60°
52°
14
59°
50°
15
58°
45°
16
58°
48°
17
58°
49°
18
59°
51°
19
58°
50°
20
60°
49°
21
60°
51°
22
59°
50°
23
60°
49°
24
60°
46°
25
57°
44°
26
57°
43°
27
56°
48°
28
59°
48°
29
58°
47°
30
58°
45°
1
57°
48°
2
58°
48°
3
58°
46°
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 56° to 63°, with overnight lows between 43° and 52°. The average high for September is 59° with an average low of 48°. 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.
