S
M
T
W
T
F
S
26
64°
59°
27
64°
61°
28
64°
61°
29
75°
59°
30
68°
63°
1
77°
59°
2
72°
61°
3
72°
55°
4
61°
54°
5
59°
52°
6
59°
50°
7
72°
45°
8
75°
50°
9
75°
63°
10
72°
55°
11
68°
48°
12
64°
54°
13
61°
54°
14
59°
50°
15
59°
52°
16
61°
50°
17
63°
52°
18
64°
54°
19
73°
54°
20
68°
59°
21
84°
57°
22
95°
64°
23
81°
63°
24
79°
63°
25
95°
72°
26
95°
72°
27
81°
63°
28
86°
64°
29
70°
66°
30
66°
64°
31
70°
59°
1
72°
57°
2
66°
61°
3
73°
59°
4
68°
57°
5
66°
57°
6
68°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Sebastian
San Sebastian's May 2026 forecast shows daily high temperatures ranging from 68° to 68°, with overnight lows between 57° and 57°. The average high for May is 68° with an average low of 57°. 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 San Sebastian. See also: June | July | August.
