S
M
T
W
T
F
S
26
88°
61°
27
84°
59°
28
82°
57°
29
90°
62°
30
81°
62°
1
64°
52°
2
73°
46°
3
78°
36°
4
82°
34°
5
84°
43°
6
92°
60°
7
78°
63°
8
78°
59°
9
69°
59°
10
84°
60°
11
94°
58°
12
67°
58°
13
85°
53°
14
82°
52°
15
82°
37°
16
97°
46°
17
94°
64°
18
100°
61°
19
95°
63°
20
94°
58°
21
92°
65°
22
93°
66°
23
94°
67°
24
93°
66°
25
83°
70°
26
86°
66°
27
90°
67°
28
92°
68°
29
92°
68°
30
84°
69°
31
82°
70°
1
86°
68°
2
88°
66°
3
81°
53°
4
80°
63°
5
80°
66°
6
79°
67°
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 79° to 88°, with overnight lows between 53° and 70°. The average high for May is 83° with an average low of 65°. 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.
