S
M
T
W
T
F
S
30
88°
69°
31
89°
68°
1
92°
68°
2
91°
67°
3
88°
68°
4
90°
68°
5
86°
66°
6
86°
63°
7
89°
66°
8
91°
67°
9
91°
66°
10
90°
66°
11
90°
65°
12
89°
64°
13
89°
64°
14
88°
63°
15
89°
64°
16
83°
60°
17
88°
65°
18
86°
64°
19
Hist. Avg.
88°
65°
20
Hist. Avg.
88°
64°
21
Hist. Avg.
88°
64°
22
Hist. Avg.
88°
64°
23
Hist. Avg.
87°
63°
24
Hist. Avg.
87°
63°
25
Hist. Avg.
87°
63°
26
Hist. Avg.
86°
62°
27
Hist. Avg.
86°
62°
28
Hist. Avg.
86°
62°
29
Hist. Avg.
86°
61°
30
Hist. Avg.
85°
61°
1
Hist. Avg.
85°
60°
2
Hist. Avg.
85°
60°
3
Hist. Avg.
84°
60°
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 83° to 92°, with overnight lows between 60° and 69°. The average high for September is 89° with an average low of 66°. 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.
