S
M
T
W
T
F
S
26
66°
47°
27
67°
47°
28
62°
46°
29
56°
44°
30
55°
38°
1
49°
32°
2
51°
28°
3
62°
35°
4
75°
47°
5
57°
46°
6
55°
39°
7
58°
35°
8
64°
37°
9
70°
43°
10
62°
39°
11
63°
38°
12
64°
38°
13
60°
42°
14
67°
42°
15
68°
40°
16
80°
55°
17
85°
59°
18
83°
66°
19
83°
61°
20
67°
53°
21
66°
47°
22
70°
48°
23
60°
52°
24
73°
52°
25
81°
58°
26
82°
61°
27
80°
58°
28
79°
52°
29
78°
52°
30
71°
53°
31
72°
52°
1
77°
59°
2
76°
55°
3
77°
57°
4
76°
53°
5
75°
54°
6
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Union City
Union City's May 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 52° and 61°. The average high for May is 75° with an average low of 55°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Union City. See also: June | July | August.
