Viana Do Castelo — Water Temperature in May

Water Temperature Range

13°C

minimum

16°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

12°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

107 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

7 hrs

Average Wind Speed

12 km/h

Average Humidity

74%

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.