S
M
T
W
T
F
S
26
78°
65°
27
79°
65°
28
77°
66°
29
77°
61°
30
75°
60°
31
76°
62°
1
78°
62°
2
79°
61°
3
77°
58°
4
74°
55°
5
74°
57°
6
81°
61°
7
81°
61°
8
80°
60°
9
79°
61°
10
82°
62°
11
82°
62°
12
83°
61°
13
84°
62°
14
82°
62°
15
80°
61°
16
77°
59°
17
75°
57°
18
75°
59°
19
76°
59°
20
76°
57°
21
74°
57°
22
74°
56°
23
78°
56°
24
83°
61°
25
82°
61°
26
82°
60°
27
81°
60°
28
77°
57°
29
79°
59°
30
82°
58°
31
77°
54°
1
76°
54°
2
75°
53°
3
77°
53°
4
77°
60°
5
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Sebastian
San Sebastian's August 2026 forecast shows daily high temperatures ranging from 74° to 84°, with overnight lows between 53° and 66°. The average high for August is 78° 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 San Sebastian. See also: September | October | November.
