S
M
T
W
T
F
S
30
95°
82°
31
94°
82°
1
93°
82°
2
94°
82°
3
94°
83°
4
95°
83°
5
95°
83°
6
85°
79°
7
86°
80°
8
85°
80°
9
82°
78°
10
82°
79°
11
84°
80°
12
85°
81°
13
84°
81°
14
86°
82°
15
85°
81°
16
85°
81°
17
86°
82°
18
85°
81°
19
84°
82°
20
82°
81°
21
82°
82°
22
83°
81°
23
83°
81°
24
84°
82°
25
83°
81°
26
83°
81°
27
84°
81°
28
83°
81°
29
83°
82°
30
84°
81°
1
83°
82°
2
84°
81°
3
83°
81°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Union
Union's September 2026 forecast shows daily high temperatures ranging from 82° to 86°, with overnight lows between 78° and 82°. The average high for September is 84° with an average low of 81°. 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.
