S
M
T
W
T
F
S
26
73°
55°
27
74°
57°
28
72°
56°
29
67°
48°
30
68°
49°
1
70°
51°
2
74°
53°
3
69°
56°
4
75°
57°
5
74°
56°
6
70°
55°
7
73°
57°
8
79°
60°
9
77°
59°
10
77°
59°
11
80°
61°
12
80°
61°
13
79°
56°
14
71°
53°
15
72°
56°
16
77°
60°
17
81°
62°
18
80°
62°
19
78°
54°
20
72°
54°
21
73°
55°
22
77°
62°
23
80°
61°
24
83°
63°
25
84°
65°
26
84°
65°
27
85°
64°
28
84°
65°
29
84°
66°
30
83°
65°
31
81°
64°
1
84°
63°
2
81°
65°
3
81°
63°
4
80°
61°
5
81°
60°
6
84°
63°
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 67° to 85°, with overnight lows between 48° and 66°. The average high for May is 77° with an average low of 59°. 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.
