S
M
T
W
T
F
S
26
83°
62°
27
89°
62°
28
82°
68°
29
80°
64°
30
68°
59°
1
60°
53°
2
71°
48°
3
76°
43°
4
80°
45°
5
79°
52°
6
76°
66°
7
70°
58°
8
65°
58°
9
72°
62°
10
82°
63°
11
76°
63°
12
83°
61°
13
82°
62°
14
80°
55°
15
85°
52°
16
84°
61°
17
88°
56°
18
90°
63°
19
90°
68°
20
89°
70°
21
80°
70°
22
84°
70°
23
83°
65°
24
83°
69°
25
72°
69°
26
77°
71°
27
83°
69°
28
81°
69°
29
79°
67°
30
78°
64°
31
75°
62°
1
78°
61°
2
77°
58°
3
78°
58°
4
79°
61°
5
81°
63°
6
82°
64°
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 72° to 83°, with overnight lows between 58° and 71°. The average high for May is 78° with an average low of 64°. 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.
