S
M
T
W
T
F
S
30
71°
57°
31
76°
60°
1
73°
60°
2
74°
56°
3
70°
54°
4
69°
54°
5
70°
55°
6
73°
58°
7
76°
57°
8
72°
53°
9
67°
51°
10
68°
55°
11
65°
43°
12
64°
49°
13
63°
48°
14
64°
47°
15
63°
45°
16
64°
46°
17
64°
45°
18
63°
45°
19
63°
42°
20
61°
41°
21
62°
42°
22
64°
50°
23
67°
47°
24
71°
52°
25
73°
52°
26
73°
51°
27
71°
46°
28
70°
50°
29
63°
43°
30
59°
48°
1
59°
51°
2
69°
40°
3
71°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Richmond Hill
Richmond Hill's September 2026 forecast shows daily high temperatures ranging from 59° to 76°, with overnight lows between 38° and 60°. 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 Richmond Hill. See also: October | November | December.
