San Antonio — Water Temperature in October

Water Temperature Range

10°C

minimum

12°C

average

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

October: Climate and Swimming Opportunities

Average Night Air Temperature

11°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

12 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

7 hrs

Average Wind Speed

13 km/h

Average Humidity

81%

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.