S
M
T
W
T
F
S
26
86°
65°
27
87°
71°
28
77°
66°
29
71°
59°
30
67°
53°
1
71°
47°
2
74°
44°
3
80°
52°
4
77°
62°
5
78°
65°
6
73°
45°
7
71°
46°
8
77°
53°
9
80°
58°
10
78°
59°
11
80°
60°
12
80°
56°
13
77°
57°
14
80°
58°
15
82°
63°
16
83°
62°
17
83°
63°
18
82°
64°
19
83°
64°
20
83°
63°
21
80°
64°
22
78°
64°
23
78°
62°
24
83°
65°
25
83°
65°
26
79°
61°
27
78°
59°
28
81°
64°
29
84°
66°
30
86°
65°
31
87°
66°
1
87°
67°
2
86°
67°
3
88°
68°
4
88°
67°
5
84°
64°
6
82°
62°
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 44° and 68°. The average high for May is 81° with an average low of 60°. 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.
