S
M
T
W
T
F
S
26
76°
65°
27
75°
66°
28
76°
66°
29
76°
65°
30
75°
65°
31
76°
64°
1
76°
66°
2
74°
64°
3
75°
65°
4
76°
66°
5
75°
65°
6
76°
65°
7
75°
64°
8
75°
66°
9
76°
66°
10
76°
67°
11
75°
67°
12
76°
66°
13
77°
66°
14
76°
65°
15
77°
66°
16
76°
65°
17
77°
66°
18
76°
67°
19
75°
66°
20
76°
67°
21
78°
67°
22
77°
66°
23
77°
67°
24
78°
67°
25
Hist. Avg.
79°
62°
26
Hist. Avg.
78°
62°
27
Hist. Avg.
78°
62°
28
Hist. Avg.
78°
62°
29
Hist. Avg.
78°
62°
30
Hist. Avg.
78°
62°
31
Hist. Avg.
78°
62°
1
Hist. Avg.
78°
62°
2
Hist. Avg.
77°
62°
3
Hist. Avg.
77°
61°
4
Hist. Avg.
77°
61°
5
Hist. Avg.
77°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in San Sebastian
San Sebastian's August 2026 forecast shows daily high temperatures ranging from 74° to 78°, with overnight lows between 64° and 67°. The average high for August is 76° with an average low of 66°. 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.
