S
M
T
W
T
F
S
30
95°
74°
31
94°
73°
1
92°
71°
2
91°
70°
3
93°
71°
4
95°
71°
5
95°
70°
6
94°
72°
7
94°
72°
8
93°
71°
9
94°
69°
10
94°
67°
11
91°
70°
12
93°
67°
13
89°
65°
14
87°
64°
15
88°
65°
16
87°
64°
17
91°
65°
18
93°
69°
19
89°
70°
20
92°
69°
21
92°
69°
22
Hist. Avg.
89°
68°
23
Hist. Avg.
88°
67°
24
Hist. Avg.
88°
67°
25
Hist. Avg.
88°
66°
26
Hist. Avg.
87°
66°
27
Hist. Avg.
87°
66°
28
Hist. Avg.
87°
66°
29
Hist. Avg.
86°
65°
30
Hist. Avg.
86°
65°
1
Hist. Avg.
86°
65°
2
Hist. Avg.
86°
64°
3
Hist. Avg.
85°
64°
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 87° to 95°, with overnight lows between 64° and 74°. The average high for September is 92° with an average low of 69°. 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.
