S
M
T
W
T
F
S
30
68°
50°
31
69°
52°
1
71°
57°
2
73°
59°
3
71°
61°
4
79°
58°
5
81°
55°
6
75°
51°
7
69°
48°
8
69°
52°
9
73°
49°
10
73°
53°
11
72°
52°
12
69°
55°
13
71°
56°
14
76°
55°
15
74°
54°
16
66°
53°
17
65°
54°
18
68°
52°
19
71°
49°
20
65°
52°
21
69°
44°
22
65°
42°
23
63°
42°
24
63°
43°
25
65°
43°
26
64°
42°
27
61°
48°
28
62°
44°
29
61°
40°
30
60°
47°
1
61°
42°
2
68°
40°
3
60°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint Lawrence
Saint Lawrence's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 38° and 61°. The average high for September is 68° with an average low of 49°. 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 Saint Lawrence. See also: October | November | December.
