S
M
T
W
T
F
S
30
72°
68°
31
79°
66°
1
82°
74°
2
88°
69°
3
81°
67°
4
77°
59°
5
76°
51°
6
76°
55°
7
76°
57°
8
75°
58°
9
79°
61°
10
75°
56°
11
72°
57°
12
71°
54°
13
69°
54°
14
71°
52°
15
70°
51°
16
74°
55°
17
73°
52°
18
68°
51°
19
74°
54°
20
75°
56°
21
75°
55°
22
74°
54°
23
72°
52°
24
68°
53°
25
73°
53°
26
72°
52°
27
70°
49°
28
62°
47°
29
63°
47°
30
62°
44°
1
60°
43°
2
62°
50°
3
67°
48°
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 60° to 88°, with overnight lows between 43° and 69°. The average high for September is 72° with an average low of 54°. 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.
