S
M
T
W
T
F
S
30
77°
57°
31
77°
52°
1
74°
51°
2
69°
53°
3
69°
52°
4
70°
51°
5
69°
51°
6
68°
52°
7
69°
51°
8
73°
51°
9
70°
54°
10
68°
56°
11
68°
56°
12
73°
55°
13
72°
54°
14
73°
51°
15
66°
49°
16
68°
49°
17
64°
51°
18
66°
53°
19
Hist. Avg.
67°
51°
20
Hist. Avg.
67°
50°
21
Hist. Avg.
67°
50°
22
Hist. Avg.
66°
50°
23
Hist. Avg.
66°
50°
24
Hist. Avg.
66°
49°
25
Hist. Avg.
65°
49°
26
Hist. Avg.
65°
49°
27
Hist. Avg.
65°
48°
28
Hist. Avg.
64°
48°
29
Hist. Avg.
64°
48°
30
Hist. Avg.
64°
47°
1
Hist. Avg.
63°
47°
2
Hist. Avg.
63°
47°
3
Hist. Avg.
63°
46°
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 49° and 57°. The average high for September is 70° with an average low of 52°. 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.
