S
M
T
W
T
F
S
26
60°
46°
27
60°
43°
28
61°
44°
29
61°
43°
30
62°
42°
1
63°
52°
2
71°
51°
3
64°
51°
4
63°
46°
5
64°
43°
6
63°
49°
7
64°
52°
8
73°
54°
9
72°
49°
10
64°
45°
11
64°
46°
12
65°
50°
13
66°
48°
14
65°
52°
15
66°
54°
16
66°
55°
17
73°
57°
18
75°
57°
19
76°
53°
20
68°
50°
21
69°
53°
22
71°
50°
23
70°
51°
24
69°
50°
25
73°
53°
26
74°
51°
27
73°
52°
28
77°
57°
29
80°
58°
30
80°
57°
31
73°
58°
1
71°
59°
2
73°
58°
3
73°
53°
4
77°
61°
5
81°
61°
6
81°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Union
Union's May 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 42° and 61°. The average high for May is 69° 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 May weather will actually feel in Union. See also: June | July | August.
