Weather in Rotterdam in July

A good month. July is a solid month to be in Rotterdam. Highs average 21.1 °C, lows 14.8 °C, and rain falls on 14 days — nothing in the month is working against you.

July ranks 2 of 12 in Rotterdam. Only June scores clearly higher, and the difference is small enough to be settled by price rather than weather.

This is persistent light rain rather than storms: 14 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

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average July reaches 30 °C. Across the twenty years measured, the hottest July day reached 33.4 °C and the coldest night fell to 11.2 °C, and the wettest single day dropped 37 mm — roughly 47% of the month's rain in one day.

July is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest July on record still delivered 135 mm against 9 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 78 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.8 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 July sits in the year

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

Daylight in July

July is at or near the longest days of Rotterdam's year: 16.3 hours of daylight, losing 1 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 16.2 °C in July — 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.

July 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 — 2.4 °C warmer, 1 day more rain. Lille is close enough to be a coin toss — 2 °C warmer, 1 day less rain.

So: July is effectively as good as it gets here — 1 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 July.