S
M
T
W
T
F
S
26
74°
43°
27
71°
45°
28
74°
48°
29
68°
50°
30
57°
38°
1
65°
30°
2
51°
37°
3
57°
31°
4
69°
35°
5
74°
38°
6
67°
54°
7
58°
35°
8
68°
45°
9
69°
49°
10
77°
53°
11
62°
36°
12
62°
41°
13
63°
43°
14
66°
41°
15
67°
45°
16
77°
50°
17
74°
52°
18
77°
56°
19
78°
56°
20
77°
48°
21
68°
49°
22
69°
49°
23
70°
51°
24
69°
49°
25
70°
49°
26
71°
50°
27
71°
47°
28
72°
48°
29
75°
52°
30
78°
55°
31
75°
56°
1
72°
57°
2
78°
55°
3
80°
57°
4
78°
58°
5
77°
58°
6
78°
57°
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 58° to 80°, with overnight lows between 35° and 58°. The average high for May is 72° with an average low of 50°. 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.
