S
M
T
W
T
F
S
26
67°
45°
27
62°
44°
28
62°
47°
29
67°
46°
30
62°
43°
1
65°
51°
2
64°
52°
3
74°
47°
4
63°
42°
5
62°
42°
6
64°
47°
7
73°
49°
8
65°
47°
9
65°
45°
10
64°
44°
11
65°
51°
12
72°
56°
13
76°
57°
14
75°
53°
15
72°
47°
16
67°
47°
17
70°
56°
18
72°
58°
19
77°
58°
20
75°
55°
21
70°
52°
22
74°
56°
23
76°
58°
24
77°
58°
25
78°
56°
26
79°
58°
27
80°
59°
28
81°
58°
29
84°
57°
30
80°
56°
31
82°
52°
1
77°
51°
2
74°
52°
3
75°
52°
4
75°
56°
5
76°
56°
6
76°
61°
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 62° to 84°, with overnight lows between 42° and 61°. The average high for May is 72° with an average low of 52°. 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.
