San Francisco — Water Temperature in August

Water Temperature Range

10°C

minimum

15°C

average

19°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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	2026	2025	2024	2023
AUG 1	-10°C	16°C	15°C	17°C
AUG 2	16°C	15°C	15°C	18°C
AUG 3	17°C	15°C	15°C	18°C
AUG 4	17°C	15°C	15°C	17°C
AUG 5	17°C	15°C	14°C	18°C
AUG 6	17°C	14°C	14°C	18°C
AUG 7	17°C	15°C	14°C	17°C
AUG 8	18°C	15°C	14°C	18°C
AUG 9	18°C	14°C	14°C	17°C
AUG 10	17°C	15°C	15°C	18°C
AUG 11	18°C	15°C	15°C	17°C
AUG 12	18°C	16°C	15°C	17°C
AUG 13	18°C	16°C	15°C	18°C
AUG 14	17°C	16°C	15°C	18°C
AUG 15	18°C	15°C	15°C	17°C
AUG 16	16°C	15°C	15°C	17°C
AUG 17	16°C	16°C	15°C	18°C
AUG 18	17°C	16°C	15°C	18°C
AUG 19	17°C	16°C	15°C	18°C
AUG 20	17°C	15°C	15°C	18°C
AUG 21	17°C	15°C	14°C	17°C
AUG 22	17°C	15°C	15°C	18°C
AUG 23	18°C	16°C	15°C	18°C
AUG 24	17°C	15°C	14°C	18°C
AUG 25	18°C	15°C	15°C	17°C
AUG 26	18°C	16°C	15°C	17°C
AUG 27	18°C	15°C	15°C	17°C
AUG 28	18°C	16°C	15°C	17°C
AUG 29	18°C	16°C	16°C	18°C
AUG 30	17°C	16°C	16°C	17°C
AUG 31	17°C	15°C	15°C	17°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.