Half Moon Bay — Water Temperature in August

Water Temperature Range

12°C

minimum

15°C

average

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