S
M
T
W
T
F
S
26
63°
50°
27
67°
49°
28
61°
48°
29
61°
42°
30
59°
36°
1
53°
40°
2
54°
32°
3
61°
36°
4
77°
48°
5
58°
47°
6
58°
42°
7
61°
38°
8
63°
50°
9
74°
51°
10
67°
49°
11
70°
42°
12
78°
42°
13
62°
45°
14
66°
39°
15
68°
46°
16
79°
59°
17
85°
62°
18
83°
67°
19
85°
67°
20
66°
48°
21
68°
49°
22
66°
60°
23
74°
60°
24
77°
57°
25
78°
58°
26
77°
62°
27
80°
60°
28
81°
62°
29
79°
61°
30
80°
62°
31
79°
62°
1
78°
61°
2
79°
55°
3
80°
61°
4
79°
60°
5
77°
57°
6
73°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Galveston
Galveston's May 2026 forecast shows daily high temperatures ranging from 66° to 81°, with overnight lows between 48° and 62°. The average high for May is 76° 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 Galveston. See also: June | July | August.
