Port Jefferson — Water Temperature in June

Water Temperature Range

14°C

minimum

17°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	2025	2024	2023	2022
JUN 1	14°C	13°C	15°C	14°C
JUN 2	14°C	14°C	14°C	14°C
JUN 3	14°C	13°C	15°C	14°C
JUN 4	15°C	14°C	15°C	14°C
JUN 5	15°C	14°C	15°C	15°C
JUN 6	15°C	15°C	16°C	14°C
JUN 7	16°C	16°C	16°C	15°C
JUN 8	16°C	16°C	17°C	15°C
JUN 9	16°C	15°C	17°C	16°C
JUN 10	16°C	16°C	17°C	16°C
JUN 11	16°C	16°C	17°C	16°C
JUN 12	17°C	17°C	18°C	15°C
JUN 13	17°C	17°C	18°C	16°C
JUN 14	17°C	17°C	18°C	15°C
JUN 15	17°C	17°C	18°C	16°C
JUN 16	18°C	17°C	19°C	16°C
JUN 17	17°C	16°C	18°C	16°C
JUN 18	18°C	17°C	19°C	16°C
JUN 19	18°C	17°C	19°C	16°C
JUN 20	18°C	18°C	19°C	17°C
JUN 21	19°C	18°C	19°C	18°C
JUN 22	18°C	18°C	18°C	18°C
JUN 23	19°C	19°C	19°C	19°C
JUN 24	20°C	19°C	19°C	20°C
JUN 25	20°C	19°C	19°C	20°C
JUN 26	20°C	19°C	19°C	20°C
JUN 27	20°C	20°C	19°C	20°C
JUN 28	20°C	19°C	20°C	20°C
JUN 29	21°C	20°C	21°C	20°C
JUN 30	20°C	20°C	21°C	20°C

June: Climate and Swimming Opportunities

Average Night Air Temperature

15°C

Average Day Air Temperature

25°C

Precipitation Amount per Month

91 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

9 hrs

Average Wind Speed

14 km/h

Average Humidity

72%

At such water and air temperatures, swimming feels cool and invigorating. It’s comfortable for a quick dip, and you’ll feel fine as long as you warm up soon after.