Sluis Temperature by Month

The average annual maximum temperature in Sluis, Zeeland, Netherlands is 15°C (59°F), with daytime highs ranging from 8°C (46°F) in January to 23°C (73°F) in August. This page covers monthly averages, day-night differences, and how Sluis compares to cities worldwide.

With significant temperature fluctuations, Sluis enjoys distinct seasons year-round. Nighttime lows range from 15°C (59°F) in August to 3°C (37°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Sluis by month:

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. August, the warmest month, averages 209 hours of sunshine.

The chart below shows the average temperature throughout the year:

Sluis's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Sluis's weather, including monthly rainfall, sunshine hours, and humidity, visit our Sluis climate page.