Oceanside — Water Temperature in January

Water Temperature Range

13°C

minimum

15°C

average

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

January: Climate and Swimming Opportunities

Average Night Air Temperature

7°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

55 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

7 hrs

Average Wind Speed

10 km/h

Average Humidity

64%

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.