S
M
T
W
T
F
S
26
79°
55°
27
80°
54°
28
78°
52°
29
79°
51°
30
73°
51°
1
71°
54°
2
73°
50°
3
72°
47°
4
73°
48°
5
77°
51°
6
81°
55°
7
81°
55°
8
80°
56°
9
82°
55°
10
82°
57°
11
83°
57°
12
83°
56°
13
82°
57°
14
82°
57°
15
75°
52°
16
77°
55°
17
81°
58°
18
80°
57°
19
83°
53°
20
78°
52°
21
77°
51°
22
79°
54°
23
80°
60°
24
78°
60°
25
81°
59°
26
84°
60°
27
86°
58°
28
87°
60°
29
87°
64°
30
88°
62°
31
88°
56°
1
87°
57°
2
88°
61°
3
88°
61°
4
87°
64°
5
85°
62°
6
85°
57°
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 71° to 88°, with overnight lows between 47° and 64°. The average high for May is 81° with an average low of 56°. 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.
