S
M
T
W
T
F
S
30
81°
51°
31
71°
52°
1
71°
59°
2
77°
57°
3
75°
51°
4
74°
54°
5
77°
49°
6
69°
50°
7
69°
50°
8
68°
46°
9
68°
52°
10
71°
48°
11
69°
46°
12
66°
45°
13
67°
46°
14
68°
51°
15
70°
45°
16
66°
45°
17
64°
44°
18
63°
42°
19
63°
44°
20
64°
45°
21
63°
47°
22
63°
44°
23
66°
51°
24
69°
46°
25
68°
52°
26
70°
50°
27
70°
42°
28
62°
42°
29
60°
49°
30
65°
49°
1
63°
47°
2
64°
48°
3
60°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Waterdown
Waterdown's September 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 40° and 59°. The average high for September is 68° 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 Waterdown. See also: October | November | December.
