S
M
T
W
T
F
S
30
70°
51°
31
77°
48°
1
71°
50°
2
70°
49°
3
69°
55°
4
74°
54°
5
76°
55°
6
76°
55°
7
67°
48°
8
66°
48°
9
67°
49°
10
69°
53°
11
74°
54°
12
74°
55°
13
66°
54°
14
67°
56°
15
65°
54°
16
65°
53°
17
66°
50°
18
65°
53°
19
64°
49°
20
66°
46°
21
65°
45°
22
64°
46°
23
64°
47°
24
67°
51°
25
70°
52°
26
70°
51°
27
Hist. Avg.
68°
44°
28
Hist. Avg.
67°
44°
29
Hist. Avg.
67°
44°
30
Hist. Avg.
66°
44°
1
Hist. Avg.
66°
43°
2
Hist. Avg.
66°
43°
3
Hist. Avg.
65°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Union
Union's September 2026 forecast shows daily high temperatures ranging from 64° to 77°, with overnight lows between 45° and 56°. The average high for September is 69° with an average low of 51°. 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. See also: October | November | December.
