S
M
T
W
T
F
S
26
69°
50°
27
62°
46°
28
54°
43°
29
62°
38°
30
58°
41°
1
59°
38°
2
67°
33°
3
75°
51°
4
83°
51°
5
60°
47°
6
61°
38°
7
74°
43°
8
77°
51°
9
78°
48°
10
74°
46°
11
85°
50°
12
83°
59°
13
79°
49°
14
83°
56°
15
92°
59°
16
88°
64°
17
86°
62°
18
81°
46°
19
64°
44°
20
66°
48°
21
70°
52°
22
74°
57°
23
77°
60°
24
83°
59°
25
79°
56°
26
83°
61°
27
84°
60°
28
83°
61°
29
78°
56°
30
80°
62°
31
82°
61°
1
82°
61°
2
78°
60°
3
73°
56°
4
74°
59°
5
79°
62°
6
81°
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 64° to 88°, with overnight lows between 44° and 64°. The average high for May is 78° with an average low of 58°. 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.
