S
M
T
W
T
F
S
30
80°
66°
31
86°
69°
1
87°
70°
2
93°
71°
3
93°
67°
4
81°
67°
5
78°
64°
6
78°
56°
7
79°
53°
8
83°
56°
9
77°
64°
10
79°
54°
11
79°
49°
12
84°
60°
13
78°
51°
14
74°
43°
15
87°
58°
16
74°
67°
17
79°
64°
18
74°
56°
19
66°
60°
20
69°
54°
21
66°
50°
22
64°
52°
23
66°
50°
24
68°
51°
25
69°
50°
26
70°
49°
27
67°
51°
28
69°
53°
29
70°
53°
30
71°
51°
1
72°
45°
2
66°
50°
3
61°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Union City
Union City's September 2026 forecast shows daily high temperatures ranging from 61° to 74°, with overnight lows between 45° and 60°. The average high for September is 68° with an average low of 52°. 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 City. See also: October | November | December.
