S
M
T
W
T
F
S
26
74°
43°
27
71°
45°
28
74°
48°
29
68°
50°
30
N/A
1
65°
40°
2
55°
35°
3
59°
42°
4
70°
51°
5
74°
52°
6
66°
44°
7
59°
36°
8
54°
37°
9
66°
47°
10
68°
47°
11
71°
50°
12
71°
51°
13
69°
48°
14
68°
47°
15
71°
53°
16
73°
53°
17
71°
52°
18
75°
54°
19
77°
54°
20
74°
53°
21
77°
55°
22
78°
55°
23
78°
54°
24
75°
55°
25
77°
55°
26
77°
56°
27
76°
56°
28
75°
55°
29
77°
56°
30
75°
55°
31
75°
55°
1
76°
57°
2
78°
57°
3
79°
53°
4
73°
51°
5
72°
51°
6
73°
52°
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 54° to 79°, with overnight lows between 35° and 57°. The average high for May is 72° with an average low of 51°. 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.
