S
M
T
W
T
F
S
26
81°
54°
27
84°
63°
28
61°
55°
29
64°
46°
30
66°
39°
1
64°
43°
2
63°
41°
3
81°
39°
4
84°
54°
5
70°
46°
6
63°
41°
7
68°
39°
8
75°
46°
9
82°
55°
10
70°
48°
11
79°
43°
12
82°
50°
13
75°
50°
14
77°
45°
15
82°
61°
16
81°
68°
17
87°
73°
18
82°
71°
19
78°
53°
20
66°
54°
21
71°
59°
22
76°
60°
23
78°
59°
24
80°
62°
25
82°
63°
26
83°
64°
27
80°
62°
28
80°
63°
29
82°
62°
30
80°
59°
31
85°
64°
1
85°
64°
2
84°
63°
3
79°
60°
4
78°
57°
5
81°
63°
6
86°
65°
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 66° to 87°, with overnight lows between 53° and 73°. The average high for May is 80° with an average low of 62°. 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.
