S
M
T
W
T
F
S
30
60°
49°
31
60°
51°
1
65°
50°
2
65°
47°
3
62°
47°
4
60°
51°
5
60°
47°
6
63°
45°
7
60°
48°
8
61°
49°
9
61°
48°
10
60°
47°
11
57°
44°
12
58°
44°
13
60°
47°
14
58°
51°
15
Hist. Avg.
61°
47°
16
Hist. Avg.
60°
46°
17
Hist. Avg.
60°
46°
18
Hist. Avg.
60°
46°
19
Hist. Avg.
60°
46°
20
Hist. Avg.
59°
45°
21
Hist. Avg.
59°
45°
22
Hist. Avg.
59°
45°
23
Hist. Avg.
59°
45°
24
Hist. Avg.
58°
44°
25
Hist. Avg.
58°
44°
26
Hist. Avg.
58°
44°
27
Hist. Avg.
57°
44°
28
Hist. Avg.
57°
43°
29
Hist. Avg.
57°
43°
30
Hist. Avg.
56°
43°
1
Hist. Avg.
56°
43°
2
Hist. Avg.
56°
42°
3
Hist. Avg.
56°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. Lawrence
St. Lawrence's September 2026 forecast shows daily high temperatures ranging from 57° to 65°, with overnight lows between 44° and 51°. The average high for September is 61° 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 St. Lawrence. See also: October | November | December.
