San Antonio — Water Temperature in March

Water Temperature Range

13°C

minimum

15°C

average

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

March: Climate and Swimming Opportunities

Average Night Air Temperature

13°C

Average Day Air Temperature

23°C

Precipitation Amount per Month

5 mm

Number of Rainy Days

Daylight per Day

12 hrs

Sunshine per Day

9 hrs

Average Wind Speed

11 km/h

Average Humidity

79%

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.