S
M
T
W
T
F
S
26
81°
68°
27
76°
60°
28
74°
60°
29
74°
59°
30
78°
61°
31
80°
59°
1
81°
61°
2
77°
60°
3
74°
58°
4
75°
58°
5
77°
57°
6
80°
58°
7
81°
61°
8
83°
62°
9
81°
61°
10
75°
59°
11
76°
57°
12
76°
55°
13
78°
57°
14
81°
60°
15
82°
62°
16
83°
62°
17
82°
61°
18
82°
62°
19
81°
61°
20
81°
61°
21
83°
62°
22
82°
62°
23
79°
60°
24
78°
58°
25
78°
57°
26
76°
53°
27
76°
54°
28
77°
58°
29
76°
52°
30
76°
54°
31
77°
54°
1
81°
55°
2
80°
56°
3
79°
54°
4
81°
57°
5
80°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Donostia-San Sebastian
Donostia-San Sebastian's August 2026 forecast shows daily high temperatures ranging from 74° to 83°, with overnight lows between 52° and 68°. The average high for August is 79° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Donostia-San Sebastian. See also: September | October | November.
