Weather in Santorini in April

How April compares

April is the 8th warmest month of the year in Santorini and ranks 119th of 134 destinations we compare for April - see where else is hot in April. Within Greece it is 36th of 44 (Greece in April). Against London's average high of 13.5°C in April, Santorini is 2.8°C warmer by day and 7.7°C warmer at night.

Daytime and night-time in April

The typical April day in Santorini peaks at 16.3°C, but that is an average: the warmest 10% of days reach 18.8°C or more. Days over 25°C are rare. Nights average 12.8°C; one night in ten drops to 10.8°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest April day here reached 24.6°C (2018-04-28) and the coldest night 5.1°C (1997-04-11).

Rain in April

Some rain (4-8 rainy days): about 4 days with 1 mm or more, 16 mm in total. Year to year it varies a lot - the wettest April was 2003 with 62 mm, the driest 2005 with 1 mm. Humidity averages 71%.

Sea temperature in April

The sea averages 16.6°C - too cold for most (under 18°c). Depending on the year it ranges from 15.9°C to 17.3°C. For the warmest sea here, come in August (24.6°C).

Sunshine and daylight

Around 8.5 hours of sunshine a day (estimated from cloud cover), 12.9 hours of daylight: the sun rises about 06:45 and sets about 19:52 local time in mid-April. Average cloud cover is 34%.

Is April a good time to visit Santorini?

April is not the strongest month here: mild days. The best months for Santorini on our scoring are July, August, September; months averaging 25°C or more: Jul, Aug.

Comfortable for walking, cool for sitting outside

April suits travellers who prefer exploring on foot to lying in the sun. The average daytime high of 16.3°C is mild rather than warm, so pack layers you can adjust instead of relying on summer clothes. Even the warmer days typically offer gentle warmth: the warmest 10% reach 18.8°C or more. Average night lows of 12.8°C make a jumper and jacket sensible for evenings outside, while the coldest 10% of nights fall to 10.8°C or lower. You are unlikely to need to organise your day around avoiding midday heat; keeping comfortable after sunset is the more useful consideration.

Plenty of light, with some wet-weather flexibility

There is about 8.5 hours of sunshine a day within 12.9 hours of daylight, giving you a generous window for being outdoors. That is a reason to consider April, but it is not a promise of clear skies throughout your stay. About 4 days in the month receive measurable rain, so bring a light waterproof and keep your plans flexible rather than treating every day as certain to be dry. A forecast check before heading out will help you choose when to spend longer outside. Sunglasses belong in your bag alongside that extra layer, not instead of it.

Choose April for time outdoors, not warm-water swimming

The sea is the clearest limitation for a beach-focused trip. At an average of 16.6°C, it is cold, and the April range of 16°C to 17°C offers little prospect of comfortably warm water. If you enjoy a cold dip, you may still want to swim, but do not make relaxed, lingering swims the centre of your plans. Time beside the sea is a more realistic aim than spending much of the day in it. April makes more sense if mild air and sunshine are enough for you; if summer warmth is essential, leave the trip until later.