S
M
T
W
T
F
S
30
85°
67°
31
91°
66°
1
93°
71°
2
94°
72°
3
96°
69°
4
97°
69°
5
88°
68°
6
81°
62°
7
82°
59°
8
83°
56°
9
84°
56°
10
91°
67°
11
92°
71°
12
87°
73°
13
87°
71°
14
87°
66°
15
81°
56°
16
83°
54°
17
87°
58°
18
91°
68°
19
85°
64°
20
88°
60°
21
90°
67°
22
83°
67°
23
68°
63°
24
65°
57°
25
N/A
26
74°
52°
27
78°
57°
28
79°
61°
29
80°
59°
30
84°
62°
1
88°
63°
2
90°
68°
3
81°
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 79° to 90°, with overnight lows between 59° and 68°. The average high for September is 84° with an average low of 63°. 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.
