San Mateo — Water Temperature in March

Water Temperature Range

10°C

minimum

12°C

average

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

March: Climate and Swimming Opportunities

Average Night Air Temperature

9°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

113 mm

Number of Rainy Days

Daylight per Day

12 hrs

Sunshine per Day

9 hrs

Average Wind Speed

14 km/h

Average Humidity

73%

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.