S
M
T
W
T
F
S
26
67°
38°
27
66°
41°
28
67°
46°
29
72°
40°
30
79°
43°
1
70°
52°
2
72°
51°
3
85°
51°
4
70°
54°
5
73°
54°
6
74°
51°
7
76°
51°
8
75°
49°
9
83°
47°
10
74°
52°
11
81°
48°
12
78°
53°
13
70°
42°
14
73°
46°
15
67°
45°
16
62°
42°
17
67°
41°
18
71°
44°
19
73°
46°
20
77°
48°
21
80°
47°
22
76°
47°
23
74°
46°
24
72°
44°
25
71°
48°
26
72°
47°
27
67°
49°
28
68°
44°
29
66°
45°
30
68°
47°
31
75°
51°
1
75°
50°
2
74°
50°
3
71°
47°
4
67°
44°
5
66°
44°
6
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Union Gap
Union Gap's May 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 41° and 51°. The average high for May is 71° with an average low of 46°. 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 Gap. See also: June | July | August.
