S
M
T
W
T
F
S
26
65°
47°
27
75°
49°
28
71°
55°
29
64°
46°
30
57°
42°
1
52°
40°
2
51°
34°
3
61°
34°
4
72°
49°
5
67°
46°
6
56°
40°
7
59°
40°
8
67°
46°
9
72°
53°
10
67°
51°
11
70°
43°
12
73°
41°
13
65°
46°
14
63°
42°
15
65°
43°
16
75°
55°
17
83°
62°
18
86°
66°
19
86°
66°
20
69°
53°
21
66°
51°
22
62°
52°
23
73°
61°
24
77°
61°
25
78°
63°
26
76°
65°
27
77°
63°
28
80°
58°
29
78°
57°
30
73°
56°
31
73°
54°
1
74°
57°
2
73°
59°
3
74°
60°
4
75°
61°
5
77°
59°
6
75°
63°
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 73° to 80°, with overnight lows between 54° and 65°. The average high for May is 76° 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.
