Weather in Rotterdam in June

A good month. June is a solid month to be in Rotterdam. Highs average 18.9 °C, lows 12.4 °C, and rain falls on 12 days — nothing in the month is working against you.

June is the highest-scoring month of the twelve. The nearest rival is July, and the month at the other end of the year is December.

Rain on 12 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. 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 June reaches 30 °C. Across the twenty years measured, the hottest June day reached 29.4 °C and the coldest night fell to 6.8 °C.

June is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest June on record still delivered 107 mm against 28 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 62 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 79%, high enough to notice on the warm days without dominating them.

How June sits in the year

The month is on the way up: 3.1 °C warmer than May, and July adds another 2.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in June

June is at or near the longest days of Rotterdam's year: 16.7 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 13.5 °C in June — too cold to swim without a wetsuit. The sea peaks at 17.7 °C in August and bottoms out at 6.4 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

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.

June 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 — 2.7 °C warmer, 1 day more rain. Lille is close enough to be a coin toss — 2.4 °C warmer, 1 day less rain.

So: June is the answer for Rotterdam. If it is booked out or priced out, July is the next best thing at 1 points behind, and December is the month to keep off the shortlist.

Every month in Rotterdam

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