S
M
T
W
T
F
S
30
73°
59°
31
75°
54°
1
76°
50°
2
70°
51°
3
68°
55°
4
72°
61°
5
74°
58°
6
76°
51°
7
69°
52°
8
69°
56°
9
72°
58°
10
70°
58°
11
73°
57°
12
71°
57°
13
70°
54°
14
66°
49°
15
64°
48°
16
64°
47°
17
65°
55°
18
65°
53°
19
67°
57°
20
72°
55°
21
70°
50°
22
67°
46°
23
62°
47°
24
61°
45°
25
60°
44°
26
59°
45°
27
Hist. Avg.
63°
46°
28
Hist. Avg.
62°
46°
29
Hist. Avg.
62°
46°
30
Hist. Avg.
62°
45°
1
Hist. Avg.
61°
45°
2
Hist. Avg.
61°
44°
3
Hist. Avg.
60°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in South Frontenac
South Frontenac's September 2026 forecast shows daily high temperatures ranging from 59° to 76°, with overnight lows between 44° and 61°. The average high for September is 69° with an average low of 53°. 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 South Frontenac. See also: October | November | December.
