San Francisco — Water Temperature in July

Water Temperature Range

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

July: Climate and Swimming Opportunities

Average Night Air Temperature

14°C

Average Day Air Temperature

21°C

Precipitation Amount per Month

1 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

10 hrs

Average Wind Speed

15 km/h

Average Humidity

70%

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.