S
M
T
W
T
F
S
26
83°
76°
27
84°
77°
28
83°
76°
29
82°
74°
30
82°
74°
1
79°
59°
2
73°
62°
3
74°
63°
4
80°
69°
5
82°
72°
6
81°
73°
7
83°
70°
8
84°
71°
9
82°
72°
10
83°
73°
11
91°
81°
12
82°
74°
13
80°
73°
14
80°
69°
15
79°
68°
16
79°
69°
17
80°
70°
18
80°
71°
19
81°
71°
20
81°
72°
21
82°
74°
22
80°
74°
23
83°
75°
24
82°
77°
25
83°
76°
26
84°
73°
27
83°
74°
28
84°
74°
29
84°
74°
30
85°
74°
31
84°
75°
1
84°
75°
2
85°
76°
3
86°
78°
4
85°
79°
5
86°
79°
6
86°
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 73° to 91°, with overnight lows between 59° and 81°. The average high for May is 82° with an average low of 73°. 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.
