Weather in Rotterdam in April

Shoulder season. April is shoulder season in Rotterdam — cheaper, quieter, and a genuine gamble. Highs sit at 12.6 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

April ranks 6 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.

Rain on 10 days, 0 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 12.6 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest April day reached 24.3 °C and the coldest night fell to -1.4 °C, and the wettest single day dropped 29 mm — roughly 76% of the month's rain in one day.

April is moderately variable: 1 mm in the driest year against 84 mm in the wettest, around an average of 38 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 13.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, which at 12.6 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How April sits in the year

The month is on the way up: 3.9 °C warmer than March, and May adds another 3.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in April

13.8 hours of daylight, gaining 1.9 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 8 °C in April — 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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

April 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 — 2.3 °C warmer, the same number of rain days. Lille is a better bet in April — 2.7 °C warmer, the same number of rain days.

So: April works, with June the better month by 16 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Rotterdam

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