S
M
T
W
T
F
S
30
86°
66°
31
87°
65°
1
82°
65°
2
81°
64°
3
82°
65°
4
82°
65°
5
81°
63°
6
81°
63°
7
85°
62°
8
81°
58°
9
81°
57°
10
80°
62°
11
79°
57°
12
85°
58°
13
84°
63°
14
85°
56°
15
81°
54°
16
77°
55°
17
78°
54°
18
80°
55°
19
83°
55°
20
83°
56°
21
82°
57°
22
83°
59°
23
82°
54°
24
80°
56°
25
81°
52°
26
81°
58°
27
80°
58°
28
80°
57°
29
81°
57°
30
81°
56°
1
80°
56°
2
80°
55°
3
78°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Union Mills
Union Mills's September 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 52° and 66°. The average high for September is 82° with an average low of 59°. 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 Union Mills. See also: October | November | December.
