Westport — Water Temperature in May

Water Temperature Range

13°C

minimum

16°C

average

18°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	2026	2025	2024	2023
MAY 1	-10°C	16°C	16°C	16°C
MAY 2	16°C	15°C	17°C	15°C
MAY 3	16°C	16°C	17°C	16°C
MAY 4	16°C	16°C	16°C	16°C
MAY 5	16°C	16°C	16°C	17°C
MAY 6	16°C	17°C	17°C	17°C
MAY 7	16°C	16°C	16°C	17°C
MAY 8	16°C	16°C	17°C	16°C
MAY 9	16°C	16°C	16°C	16°C
MAY 10	16°C	15°C	16°C	16°C
MAY 11	16°C	16°C	16°C	17°C
MAY 12	16°C	15°C	16°C	16°C
MAY 13	16°C	16°C	16°C	16°C
MAY 14	16°C	16°C	16°C	16°C
MAY 15	16°C	16°C	16°C	16°C
MAY 16	15°C	15°C	16°C	16°C
MAY 17	15°C	15°C	16°C	16°C
MAY 18	15°C	15°C	16°C	16°C
MAY 19	15°C	15°C	16°C	15°C
MAY 20	15°C	15°C	16°C	16°C
MAY 21	15°C	15°C	16°C	15°C
MAY 22	15°C	16°C	16°C	15°C
MAY 23	15°C	15°C	16°C	15°C
MAY 24	15°C	15°C	16°C	15°C
MAY 25	15°C	15°C	16°C	15°C
MAY 26	15°C	15°C	16°C	15°C
MAY 27	15°C	15°C	16°C	15°C
MAY 28	15°C	15°C	15°C	15°C
MAY 29	15°C	15°C	15°C	15°C
MAY 30	15°C	16°C	16°C	15°C
MAY 31	15°C	15°C	16°C	15°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

6°C

Average Day Air Temperature

13°C

Precipitation Amount per Month

111 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

5 hrs

Average Wind Speed

14 km/h

Average Humidity

86%

With such a ratio between the average monthly temperatures of water and air, swimming usually feels uncomfortably cold. Even a short dip can leave you chilled, especially once you get out into the cool air.