S
M
T
W
T
F
S
30
92°
74°
31
91°
73°
1
97°
73°
2
98°
70°
3
96°
76°
4
97°
74°
5
94°
73°
6
94°
70°
7
91°
69°
8
101°
72°
9
84°
70°
10
86°
64°
11
89°
62°
12
76°
60°
13
63°
59°
14
85°
57°
15
72°
60°
16
74°
59°
17
81°
67°
18
96°
72°
19
83°
67°
20
67°
61°
21
69°
58°
22
N/A
23
75°
58°
24
N/A
25
64°
58°
26
77°
62°
27
80°
62°
28
75°
61°
29
79°
63°
30
72°
65°
1
67°
53°
2
70°
47°
3
77°
47°
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.
