S
M
T
W
T
F
S
30
88°
71°
31
91°
68°
1
94°
71°
2
97°
70°
3
97°
73°
4
97°
72°
5
97°
72°
6
93°
68°
7
84°
70°
8
88°
63°
9
90°
61°
10
91°
66°
11
95°
70°
12
82°
68°
13
90°
70°
14
93°
66°
15
82°
70°
16
86°
64°
17
90°
61°
18
95°
70°
19
90°
70°
20
88°
68°
21
90°
66°
22
N/A
23
70°
61°
24
63°
57°
25
75°
50°
26
79°
46°
27
81°
46°
28
79°
50°
29
82°
54°
30
82°
54°
1
84°
57°
2
88°
63°
3
79°
70°
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 ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
