Portland — Water Temperature in January

Water Temperature Range

11°C

minimum

16°C

average

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

January: Climate and Swimming Opportunities

Average Night Air Temperature

9°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

51 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

4 hrs

Average Wind Speed

19 km/h

Average Humidity

77%

At such water and air temperatures, swimming often feels chilly and is best for short swims. Getting out can feel cold, so it helps to have dry clothes ready right away.