Stinson Beach — Water Temperature in August

Water Temperature Range

10°C

minimum

14°C

average

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

August: Climate and Swimming Opportunities

Average Night Air Temperature

14°C

Average Day Air Temperature

22°C

Precipitation Amount per Month

2 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

9 hrs

Average Wind Speed

14 km/h

Average Humidity

72%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.