Your April weather guide
MildWeather in Mykonos in April
Mykonos in April suits a mild-weather break, not a reliably hot beach holiday. Average daytime highs are 17°C, while the sea sits around 16°C, so walking and spending time outdoors are a better fit than long swims. Rain falls on about 4 days during the month, making some flexibility sensible without letting showers dominate your plans. For a UK traveller, the appeal is extra warmth and time outside rather than summer conditions.
Long-term climate averages for Mykonos, not a forecast · 1991-2020
Mykonos, month by month
Your snapshot
At a glance
The useful details for Mykonos.
- Average daytime high
- 17.0°C
- 9 in 10 days stay below 19°C
- Average night-time low
- 13.8°C
- coldest 10% of nights: 12°C or lower
- Compared with London
- +3.5°C
- London averages 13.5°C in April
- Sea temperature
- 15.9°C
- year to year: 15°C to 17°C
- Sunshine per day (est.)
- 8.4h
- 65% of 13.0 h of daylight
- Rainy days (1 mm+)
- 4
- 21 mm over the month
- Humidity
- 73%
- Days over 25°C
- 0%
- none over 30°C
- Record high 1991-2020
- 25.4°C
- 2018-04-25
- Record low 1991-2020
- 5.5°C
- 1997-04-08
- Flight from London
- ≈ 3 h 54 min
- 2517 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How April compares
April is the 8th warmest month of the year in Mykonos and ranks 109th of 134 destinations we compare for April - see where else is hot in April. Within Greece it is 30th of 44 (Greece in April). Against London's average high of 13.5°C in April, Mykonos is 3.5°C warmer by day and 8.7°C warmer at night.
Daytime and night-time in April
The typical April day in Mykonos peaks at 17.0°C, but that is an average: the warmest 10% of days reach 19.3°C or more. Roughly 1 in 1000 days top 25°C. Nights average 13.8°C; one night in ten drops to 11.5°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 25.4°C (2018-04-25) and the coldest night 5.5°C (1997-04-08).
Rain in April
Some rain (4-8 rainy days): about 4 days with 1 mm or more, 21 mm in total. Year to year it varies a lot - the wettest April was 2003 with 71 mm, the driest 2018 with 1 mm. Humidity averages 73%.
Sea temperature in April
The sea averages 15.9°C - too cold for most (under 18°c). Depending on the year it ranges from 15.2°C to 16.6°C. For the warmest sea here, come in August (24.3°C).
Sunshine and daylight
Around 8.4 hours of sunshine a day (estimated from cloud cover), 13.0 hours of daylight: the sun rises about 06:44 and sets about 19:54 local time in mid-April. Average cloud cover is 36%.
Is April a good time to visit Mykonos?
April is not the strongest month here: mild days. The best months for Mykonos on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.
Comfortable days, but keep a layer handy
Plan for mild afternoons rather than heat that dictates your day. A T-shirt may feel comfortable in sunshine, but bring a jumper or light jacket for sitting outside and for evenings, when the average low is around 14°C. You are unlikely to need to organise everything around avoiding midday heat; instead, use the warmer part of the day for relaxed outdoor time. April offers about 8.4 hours of sunshine within 13 hours of daylight, giving you plenty of scope to be outside. That does not mean constant blue sky, so pack clothes you can layer rather than relying entirely on summer outfits.
Better for time by the sea than time in it
The sea is the main catch if your idea of a Greek island holiday centres on swimming. At around 16°C, it is cold rather than merely refreshing, so do not assume that a sunny afternoon will translate into a comfortable dip. April makes more sense if you enjoy being beside the water without needing to spend long in it. Rain is another reason to keep plans flexible, though about 4 rainy days suggests it need not define the trip. Take a light waterproof and leave room to move outdoor plans around. Choose this month for mild conditions, not for dependable beach heat.
A little perspective
Mykonos through the year
April is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 13.1°C | 10.4°C | 15.8°C | 4.5 | 75 | 11 | 0% |
| February | 13.4°C | 10.5°C | 15.4°C | 5.3 | 64 | 9 | 0% |
| March | 14.7°C | 11.7°C | 15.3°C | 6.9 | 45 | 7 | 0% |
| AprilSelected | 17.0°C | 13.8°C | 15.9°C | 8.4 | 21 | 4 | 0% |
| May | 20.3°C | 17.1°C | 18.1°C | 10.3 | 10 | 2 | 2% |
| Junebest | 24.3°C | 21.0°C | 21.6°C | 13.2 | 2 | 1 | 33% |
| Julybest | 26.2°C | 23.3°C | 23.6°C | 14.1 | 0 | 0 | 81% |
| Augustbest | 26.3°C | 23.7°C | 24.3°C | 13.2 | 0 | 0 | 84% |
| September | 24.3°C | 21.5°C | 23.5°C | 10.7 | 6 | 1 | 38% |
| October | 21.1°C | 18.4°C | 21.4°C | 7.6 | 31 | 4 | 3% |
| November | 17.6°C | 14.9°C | 18.6°C | 5.4 | 43 | 6 | 0% |
| December | 14.5°C | 11.9°C | 16.7°C | 4.2 | 69 | 10 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in April
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Mykonos in April FAQs
Plain answers, grounded in the averages.
Is Mykonos hot in April?
Mykonos is mild in April: the average daytime high is 17.0°C and nights average 13.8°C. Roughly 1 in 1000 April days reach 25°C.
Can you swim in the sea in Mykonos in April?
The sea around Mykonos averages 15.9°C in April, which is cold for swimming without a wetsuit. Between 1991 and 2020 it ranged from 15°C to 17°C depending on the year.
How much does it rain in Mykonos in April?
Mykonos sees about 4 rainy days (1 mm or more) and 21 mm of rain in a typical April. The wettest April between 1991 and 2020 was 2003 (71 mm) and the driest was 2018 (1 mm).
How sunny is Mykonos in April?
Mykonos gets around 8.4 hours of sunshine a day in April out of 13.0 hours of daylight (estimated from average cloud cover).
How does Mykonos compare with the UK in April?
Mykonos is on average 3.5°C warmer than London by day in April (17.0°C against 13.5°C).
What is the hottest April on record in Mykonos?
Between 1991 and 2020 the hottest April day in Mykonos reached 25.4°C on 2018-04-25, and the coldest night dropped to 5.5°C on 1997-04-08.
Is Mykonos much warmer than London in April?
Mykonos has an average daytime high of 17°C, compared with 13.5°C in London, a difference of 3.5°C. That is a noticeable step up, but not a jump into summer. You will still want layers, especially once the sun goes down.
Should I wait until summer if warmth is my priority?
Yes, if heat matters more than mild outdoor weather. July, August and June are the stronger choices overall. April's average high is 17°C, so it suits travellers happy with lighter layers rather than those counting on hot afternoons and comfortable sea swimming.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Mykonos. Sea temperature from the nearest 5 km sea cell, 2.3 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C