S
M
T
W
T
F
S
30
80°
54°
31
79°
48°
1
74°
47°
2
72°
49°
3
72°
48°
4
73°
48°
5
71°
47°
6
71°
47°
7
72°
46°
8
74°
48°
9
72°
52°
10
70°
47°
11
70°
50°
12
75°
50°
13
74°
51°
14
75°
49°
15
68°
46°
16
68°
46°
17
66°
45°
18
69°
49°
19
67°
44°
20
66°
50°
21
Hist. Avg.
69°
44°
22
Hist. Avg.
68°
44°
23
Hist. Avg.
68°
44°
24
Hist. Avg.
68°
43°
25
Hist. Avg.
67°
43°
26
Hist. Avg.
67°
43°
27
Hist. Avg.
67°
42°
28
Hist. Avg.
66°
42°
29
Hist. Avg.
66°
41°
30
Hist. Avg.
66°
41°
1
Hist. Avg.
65°
41°
2
Hist. Avg.
65°
40°
3
Hist. Avg.
64°
40°
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 66° to 80°, with overnight lows between 44° and 54°. The average high for September is 72° with an average low of 48°. 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.
