Weather in Amsterdam in September

How September compares

September is the 4th warmest month of the year in Amsterdam and ranks 133rd of 134 destinations we compare for September - see where else is hot in September. Against London's average high of 18.6°C in September, Amsterdam is 0.6°C cooler by day and 1.2°C warmer at night.

Daytime and night-time in September

The typical September day in Amsterdam peaks at 18.0°C, but that is an average: the warmest 10% of days reach 22.0°C or more. Roughly 1 in 48 days top 25°C and 1 in 1000 pass 30°C. Nights average 12.4°C; one night in ten drops to 9.3°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest September day here reached 30.0°C (2020-09-15) and the coldest night 4.2°C (2018-09-29).

Rain in September

Wet (more than 8 rainy days): about 12 days with 1 mm or more, 70 mm in total. Year to year it varies a lot - the wettest September was 1998 with 147 mm, the driest 2014 with 17 mm. Humidity averages 81%.

Sea temperature in September

The sea averages 16.8°C - too cold for most (under 18°c). Depending on the year it ranges from 15.8°C to 18.0°C. For the warmest sea here, come in August (19.5°C).

Sunshine and daylight

Around 4.3 hours of sunshine a day (estimated from cloud cover), 12.4 hours of daylight: the sun rises about 07:15 and sets about 19:56 local time in mid-September. Average cloud cover is 65%.

Is September a good time to visit Amsterdam?

September is not the strongest month here: mild days and frequent rain. The best months for Amsterdam on our scoring are July, August, June.

Comfortable for walking, cool when you stop

The mild daytime temperatures suit spending time outdoors without planning everything around midday heat. A light layer over a T-shirt gives you more flexibility than dressing for summer throughout the day, especially when you stop walking or sit outside. There can still be warmer spells: the warmest 10% of days reach 22°C or more, so keep something lighter in your bag. Evenings call for a jumper or jacket, and the coldest 10% of nights fall to around 9°C or below. September works well if you prefer mild conditions, but it is not a dependable choice for warmth from morning through to night.

Allow room for rain in your plans

Rain is a practical consideration rather than a reason to rule September out. With about 12 rainy days, it makes sense to bring a waterproof jacket and shoes you are comfortable wearing in wet conditions. Leave outdoor plans movable rather than relying on a dry day for something important. There are about 4.3 hours of sunshine within 12.4 hours of daylight, so you have time for exploring, but should not expect clear skies throughout. An indoor alternative will make a wet spell less disruptive. If reliable sunshine is central to your holiday, the weather here is likely to feel too uncertain.