S
M
T
W
T
F
S
26
83°
76°
27
84°
77°
28
84°
76°
29
83°
75°
30
84°
74°
1
76°
58°
2
74°
56°
3
76°
63°
4
79°
67°
5
83°
74°
6
82°
76°
7
78°
67°
8
76°
68°
9
87°
74°
10
84°
75°
11
80°
71°
12
83°
69°
13
84°
71°
14
84°
73°
15
84°
75°
16
85°
76°
17
84°
78°
18
86°
78°
19
86°
68°
20
73°
69°
21
79°
72°
22
84°
71°
23
85°
71°
24
80°
73°
25
83°
73°
26
84°
74°
27
80°
67°
28
83°
71°
29
86°
75°
30
87°
77°
31
86°
78°
1
87°
77°
2
87°
76°
3
86°
77°
4
87°
80°
5
85°
79°
6
88°
78°
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 85° to 88°, with overnight lows between 76° and 80°. The average high for May is 87° with an average low of 78°. 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.
