S
M
T
W
T
F
S
26
59°
43°
27
69°
43°
28
64°
46°
29
61°
49°
30
63°
49°
1
66°
46°
2
64°
50°
3
63°
46°
4
74°
46°
5
86°
57°
6
73°
56°
7
67°
50°
8
65°
48°
9
69°
52°
10
77°
50°
11
63°
52°
12
68°
46°
13
75°
55°
14
66°
52°
15
65°
54°
16
81°
62°
17
85°
65°
18
74°
62°
19
85°
68°
20
79°
59°
21
71°
57°
22
70°
57°
23
70°
58°
24
71°
57°
25
69°
56°
26
74°
57°
27
69°
56°
28
70°
54°
29
70°
56°
30
71°
62°
31
78°
59°
1
72°
57°
2
73°
57°
3
72°
56°
4
73°
56°
5
74°
63°
6
79°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Union Square
Union Square's May 2026 forecast shows daily high temperatures ranging from 65° to 85°, with overnight lows between 52° and 68°. The average high for May is 73° with an average low of 58°. 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 Square. See also: June | July | August.
