S
M
T
W
T
F
S
30
84°
54°
31
84°
55°
1
83°
51°
2
80°
50°
3
78°
53°
4
79°
51°
5
83°
51°
6
84°
52°
7
77°
51°
8
80°
52°
9
77°
54°
10
80°
46°
11
80°
48°
12
83°
52°
13
Hist. Avg.
82°
48°
14
Hist. Avg.
82°
48°
15
Hist. Avg.
81°
48°
16
Hist. Avg.
81°
47°
17
Hist. Avg.
80°
47°
18
Hist. Avg.
80°
46°
19
Hist. Avg.
79°
46°
20
Hist. Avg.
79°
45°
21
Hist. Avg.
78°
45°
22
Hist. Avg.
78°
44°
23
Hist. Avg.
78°
44°
24
Hist. Avg.
77°
44°
25
Hist. Avg.
76°
43°
26
Hist. Avg.
76°
43°
27
Hist. Avg.
76°
42°
28
Hist. Avg.
75°
42°
29
Hist. Avg.
74°
41°
30
Hist. Avg.
74°
41°
1
Hist. Avg.
74°
40°
2
Hist. Avg.
73°
40°
3
Hist. Avg.
72°
39°
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 77° to 84°, with overnight lows between 46° and 55°. The average high for September is 81° 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.
