S
M
T
W
T
F
S
30
74°
61°
31
68°
62°
1
72°
66°
2
78°
59°
3
77°
53°
4
75°
51°
5
76°
52°
6
75°
52°
7
77°
47°
8
77°
52°
9
71°
63°
10
71°
49°
11
70°
42°
12
78°
45°
13
72°
46°
14
63°
41°
15
65°
40°
16
71°
49°
17
71°
49°
18
65°
41°
19
64°
40°
20
68°
41°
21
58°
38°
22
64°
36°
23
N/A
24
69°
39°
25
70°
35°
26
74°
40°
27
73°
45°
28
68°
54°
29
71°
53°
30
68°
53°
1
64°
58°
2
64°
38°
3
63°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Gravenhurst
Gravenhurst's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Gravenhurst. See also: October | November | December.
