Weather in Rotterdam in August

A good month. August works. It is not the peak, but nothing about it fights you. You should expect rain on 15 days of the month, which is more days wet than dry.

August ranks 4 of 12 in Rotterdam: past the worst of the year but short of June, which is the month to book if the dates are open.

This is persistent light rain rather than storms: 15 wet days but only 2 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest August day reached 32 °C and the coldest night fell to 10.9 °C, and the wettest single day dropped 35 mm — roughly 40% of the month's rain in one day.

August is moderately variable: 28 mm in the driest year against 174 mm in the wettest, around an average of 87 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 13.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 21.1 °C in July, 21.3 here, 18.9 in September. Nothing about the timing within the month matters much.

Daylight in August

14.7 hours of daylight, losing 1.8 hours across the month. That is between Rotterdam's extremes of 16.7 and 7.8 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 17.7 °C in August — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Rotterdam versus nearby

If Rotterdam is one option among several, the nearby comparison is worth making. Breda is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Lille is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: August is effectively as good as it gets here — 3 points behind June, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Rotterdam

See all twelve months in Rotterdam, or where else to go in August.