S
M
T
W
T
F
S
26
68°
52°
27
61°
46°
28
64°
43°
29
70°
48°
30
73°
48°
1
72°
55°
2
61°
54°
3
64°
43°
4
68°
46°
5
72°
50°
6
79°
64°
7
75°
55°
8
55°
48°
9
52°
41°
10
55°
43°
11
59°
43°
12
66°
46°
13
57°
46°
14
57°
41°
15
N/A
16
58°
50°
17
56°
47°
18
57°
44°
19
59°
48°
20
56°
46°
21
57°
44°
22
56°
44°
23
58°
46°
24
59°
48°
25
60°
48°
26
61°
47°
27
58°
50°
28
60°
49°
29
60°
52°
30
61°
52°
31
57°
48°
1
58°
51°
2
58°
48°
3
56°
47°
4
57°
50°
5
57°
50°
6
58°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Union
Union's May 2026 forecast shows daily high temperatures ranging from 56° to 61°, with overnight lows between 44° and 52°. The average high for May is 58° with an average low of 48°. 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.
