S
M
T
W
T
F
S
30
72°
66°
31
71°
66°
1
81°
68°
2
82°
67°
3
85°
66°
4
78°
62°
5
77°
61°
6
72°
59°
7
78°
57°
8
78°
59°
9
75°
69°
10
79°
58°
11
73°
52°
12
78°
55°
13
82°
57°
14
69°
53°
15
73°
57°
16
78°
61°
17
77°
59°
18
71°
53°
19
64°
52°
20
70°
55°
21
60°
49°
22
65°
44°
23
68°
46°
24
N/A
25
70°
49°
26
74°
52°
27
73°
53°
28
68°
56°
29
73°
57°
30
72°
58°
1
73°
54°
2
72°
55°
3
66°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Richmond Hill
Richmond Hill's September 2026 forecast shows daily high temperatures ranging from 66° to 74°, with overnight lows between 49° and 58°. The average high for September is 71° with an average low of 54°. 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.
