San Sebastián — Water Temperature in August

Water Temperature Range

20°C

minimum

23°C

average

25°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
AUG 1	22°C	22°C	22°C	23°C
AUG 2	23°C	22°C	22°C	24°C
AUG 3	22°C	23°C	21°C	23°C
AUG 4	23°C	23°C	22°C	23°C
AUG 5	22°C	22°C	21°C	23°C
AUG 6	22°C	22°C	22°C	22°C
AUG 7	22°C	23°C	21°C	23°C
AUG 8	22°C	22°C	22°C	23°C
AUG 9	22°C	22°C	22°C	23°C
AUG 10	23°C	23°C	22°C	23°C
AUG 11	22°C	23°C	21°C	23°C
AUG 12	23°C	22°C	21°C	24°C
AUG 13	22°C	22°C	22°C	23°C
AUG 14	23°C	23°C	21°C	24°C
AUG 15	23°C	24°C	22°C	24°C
AUG 16	23°C	24°C	22°C	23°C
AUG 17	22°C	22°C	22°C	23°C
AUG 18	22°C	23°C	20°C	23°C
AUG 19	23°C	24°C	21°C	23°C
AUG 20	22°C	23°C	21°C	23°C
AUG 21	23°C	23°C	22°C	23°C
AUG 22	22°C	23°C	21°C	23°C
AUG 23	23°C	23°C	22°C	23°C
AUG 24	23°C	23°C	23°C	23°C
AUG 25	23°C	23°C	22°C	24°C
AUG 26	23°C	23°C	22°C	23°C
AUG 27	23°C	23°C	22°C	23°C
AUG 28	23°C	23°C	23°C	24°C
AUG 29	23°C	23°C	22°C	24°C
AUG 30	22°C	22°C	22°C	23°C
AUG 31	22°C	22°C	22°C	23°C

August: Climate and Swimming Opportunities

Average Night Air Temperature

17°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

83 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

6 hrs

Average Wind Speed

12 km/h

Average Humidity

78%

With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.