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
86°
68°
28
88°
65°
29
74°
62°
30
72°
62°
31
73°
61°
1
78°
63°
2
71°
66°
3
76°
60°
4
72°
62°
5
73°
61°
6
78°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Donostia-San Sebastian
Donostia-San Sebastian's May 2026 forecast shows daily high temperatures ranging from 71° to 88°, with overnight lows between 60° and 68°. The average high for May is 76° with an average low of 63°. 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 Donostia-San Sebastian. See also: June | July | August.
