S
M
T
W
T
F
S
30
62°
48°
31
63°
51°
1
61°
49°
2
61°
50°
3
62°
51°
4
63°
50°
5
62°
52°
6
62°
50°
7
Hist. Avg.
61°
49°
8
Hist. Avg.
60°
49°
9
Hist. Avg.
60°
49°
10
Hist. Avg.
60°
49°
11
Hist. Avg.
60°
49°
12
Hist. Avg.
60°
49°
13
Hist. Avg.
60°
49°
14
Hist. Avg.
60°
49°
15
Hist. Avg.
60°
49°
16
Hist. Avg.
59°
48°
17
Hist. Avg.
59°
48°
18
Hist. Avg.
59°
48°
19
Hist. Avg.
59°
48°
20
Hist. Avg.
59°
48°
21
Hist. Avg.
58°
48°
22
Hist. Avg.
58°
47°
23
Hist. Avg.
58°
47°
24
Hist. Avg.
58°
47°
25
Hist. Avg.
58°
47°
26
Hist. Avg.
57°
47°
27
Hist. Avg.
57°
47°
28
Hist. Avg.
57°
46°
29
Hist. Avg.
57°
46°
30
Hist. Avg.
57°
46°
1
Hist. Avg.
56°
46°
2
Hist. Avg.
56°
46°
3
Hist. Avg.
56°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lanark
Lanark's September 2026 forecast shows daily high temperatures ranging from 61° to 63°, with overnight lows between 48° and 52°. The average high for September is 62° with an average low of 50°. 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.
