S
M
T
W
T
F
S
30
76°
61°
31
79°
60°
1
75°
57°
2
69°
56°
3
69°
57°
4
70°
58°
5
74°
59°
6
77°
60°
7
77°
60°
8
76°
59°
9
77°
59°
10
76°
58°
11
75°
59°
12
76°
58°
13
74°
58°
14
70°
46°
15
64°
47°
16
66°
50°
17
67°
51°
18
65°
45°
19
66°
50°
20
66°
53°
21
72°
54°
22
72°
52°
23
71°
45°
24
65°
45°
25
67°
48°
26
70°
52°
27
70°
50°
28
67°
42°
29
63°
38°
30
58°
43°
1
58°
50°
2
66°
47°
3
66°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Unionville
Unionville's September 2026 forecast shows daily high temperatures ranging from 58° to 79°, with overnight lows between 38° and 61°. The average high for September is 70° 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 Unionville. See also: October | November | December.
