S
M
T
W
T
F
S
26
67°
49°
27
76°
50°
28
74°
59°
29
65°
49°
30
59°
41°
1
57°
42°
2
57°
36°
3
62°
33°
4
77°
50°
5
68°
56°
6
60°
44°
7
61°
40°
8
71°
42°
9
74°
54°
10
71°
55°
11
71°
51°
12
75°
44°
13
72°
49°
14
64°
42°
15
69°
41°
16
75°
57°
17
84°
63°
18
86°
66°
19
86°
64°
20
71°
55°
21
68°
52°
22
67°
58°
23
71°
61°
24
74°
61°
25
75°
65°
26
77°
66°
27
74°
65°
28
78°
61°
29
77°
59°
30
73°
58°
31
74°
56°
1
77°
58°
2
73°
58°
3
74°
59°
4
75°
63°
5
79°
60°
6
76°
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 71° to 79°, with overnight lows between 56° and 66°. The average high for May is 75° with an average low of 61°. 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.
