S
M
T
W
T
F
S
26
77°
59°
27
70°
54°
28
66°
50°
29
81°
59°
30
73°
61°
1
65°
53°
2
62°
44°
3
68°
44°
4
77°
51°
5
81°
58°
6
80°
59°
7
76°
44°
8
69°
45°
9
74°
49°
10
77°
57°
11
76°
56°
12
79°
57°
13
78°
56°
14
79°
54°
15
83°
59°
16
82°
58°
17
81°
60°
18
79°
60°
19
80°
59°
20
83°
60°
21
84°
60°
22
84°
61°
23
83°
61°
24
84°
60°
25
84°
62°
26
82°
62°
27
82°
61°
28
79°
62°
29
81°
62°
30
82°
61°
31
83°
62°
1
85°
63°
2
86°
64°
3
86°
64°
4
85°
61°
5
79°
58°
6
78°
58°
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 86°, with overnight lows between 44° and 64°. The average high for May is 79° with an average low of 57°. 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.
