S
M
T
W
T
F
S
26
67°
52°
27
70°
50°
28
62°
50°
29
72°
55°
30
71°
50°
1
66°
43°
2
64°
41°
3
66°
35°
4
77°
38°
5
78°
46°
6
70°
60°
7
66°
46°
8
70°
40°
9
76°
45°
10
82°
49°
11
65°
52°
12
72°
45°
13
76°
43°
14
63°
43°
15
75°
37°
16
83°
50°
17
89°
58°
18
91°
61°
19
92°
60°
20
92°
59°
21
86°
60°
22
60°
55°
23
57°
53°
24
68°
55°
25
82°
64°
26
82°
67°
27
75°
63°
28
79°
52°
29
74°
55°
30
73°
50°
31
69°
52°
1
75°
51°
2
72°
48°
3
71°
51°
4
74°
56°
5
76°
58°
6
71°
56°
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 69° to 79°, with overnight lows between 48° and 63°. The average high for May is 74° with an average low of 54°. 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.
