Your August weather guide
HotWeather in Mykonos in August
August is a good choice for Mykonos if you want warm swimming weather and very little rain, but not if cool evenings are essential. Expect daytime highs around 26°C, nights near 24°C and a sea temperature of 24.3°C. For a UK traveller, the main appeal is the combination of warmth and long sunny days. The catch is that the warmth barely eases after dark, so comfortable sleeping arrangements matter as much as daytime plans.
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
- 26.3°C
- 9 in 10 days stay below 28°C
- Average night-time low
- 23.7°C
- coldest 10% of nights: 22°C or lower
- Compared with London
- +4.9°C
- London averages 21.4°C in August
- Sea temperature
- 24.3°C
- year to year: 23°C to 26°C
- Sunshine per day (est.)
- 13.2h
- 99% of 13.4 h of daylight
- Rainy days (1 mm+)
- 0
- 0 mm over the month
- Humidity
- 73%
- Days over 25°C
- 84%
- 0% over 30°C
- Record high 1991-2020
- 31.0°C
- 2020-08-01
- Record low 1991-2020
- 19.3°C
- 1995-08-31
- 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 August compares
August is the 1st warmest month of the year in Mykonos and ranks 115th of 134 destinations we compare for August - see where else is hot in August. Within Greece it is 42nd of 44 (Greece in August). Against London's average high of 21.4°C in August, Mykonos is 4.9°C warmer by day and 10.2°C warmer at night.
Daytime and night-time in August
The typical August day in Mykonos peaks at 26.3°C, but that is an average: the warmest 10% of days reach 28.2°C or more. About 84% of days top 25°C and 1 in 250 pass 30°C. Nights average 23.7°C; one night in ten drops to 22.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 31.0°C (2020-08-01) and the coldest night 19.3°C (1995-08-31).
Rain in August
Dry (3 rainy days or fewer): about 0 days with 1 mm or more, 0 mm in total. Year to year it varies a lot - the wettest August was 2005 with 6 mm, the driest 1991 with 0 mm. Humidity averages 73%.
Sea temperature in August
The sea averages 24.3°C - warm enough to swim (22°c+). Depending on the year it ranges from 23.3°C to 25.6°C. This is the warmest the sea gets here all year.
Sunshine and daylight
Around 13.2 hours of sunshine a day (estimated from cloud cover), 13.4 hours of daylight: the sun rises about 06:35 and sets about 20:12 local time in mid-August. Average cloud cover is 2%.
Is August a good time to visit Mykonos?
Yes - it is one of the better months: hot days, little rain and long sunny days. The best months for Mykonos on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.
Warm days, with little cooling after dark
August is Mykonos's warmest month, though its average daytime high is not extreme. Temperatures reach 25°C on 84% of days, making light summer clothing a sensible default rather than something to pack just in case. Humidity averages 73%, so the temperature alone does not tell the whole comfort story: breathable fabrics and breaks from the midday sun are sensible. The bigger consideration is bedtime. With average night lows around 24°C, do not expect the fresh evenings you might welcome after a warm day in Britain. Choose accommodation with cooling if you struggle to sleep in warmth, and keep heavier clothing to a minimum.
Good swimming conditions and little need to plan around rain
The sea averages 24.3°C, comfortably within swimming territory rather than a bracing dip. That makes August well suited to travellers who want swimming to be a regular part of their holiday. Rainy days average about 0, so wet-weather alternatives need not drive your plans, although an average is not a guarantee of completely dry weather. Sunshine lasts about 13.2 hours a day, leaving plenty of scope to swim or spend time outdoors away from midday. Pack sun protection and make shade part of the day rather than treating the moderate-looking air temperature as permission to stay exposed. Light clothing will be more useful than bulky rainwear.
A little perspective
Mykonos through the year
August 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% |
| April | 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% |
| AugustSelectedbest | 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 August
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
Spain · 27°C by day · sea 23°C
Tenerife
Spain · 27°C by day · sea 23°C
La Gomera
Spain · 27°C by day · sea 26°C
Menorca
Turkey · 28°C by day · sea 24°C
Istanbul
Bulgaria · 27°C by day · sea 25°C
Sunny Beach
A little more detail
Mykonos in August FAQs
Plain answers, grounded in the averages.
Is Mykonos hot in August?
Mykonos is hot in August: the average daytime high is 26.3°C and nights average 23.7°C. About 84% of August days reach 25°C or more.
Can you swim in the sea in Mykonos in August?
The sea around Mykonos averages 24.3°C in August, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 23°C to 26°C depending on the year.
How much does it rain in Mykonos in August?
Mykonos sees about 0 rainy days (1 mm or more) and 0 mm of rain in a typical August. The wettest August between 1991 and 2020 was 2005 (6 mm) and the driest was 1991 (0 mm).
How sunny is Mykonos in August?
Mykonos gets around 13.2 hours of sunshine a day in August out of 13.4 hours of daylight (estimated from average cloud cover).
How does Mykonos compare with the UK in August?
Mykonos is on average 4.9°C warmer than London by day in August (26.3°C against 21.4°C).
What is the hottest August on record in Mykonos?
Between 1991 and 2020 the hottest August day in Mykonos reached 31.0°C on 2020-08-01, and the coldest night dropped to 19.3°C on 1995-08-31.
How much warmer is Mykonos than London in August?
Mykonos has an average daytime high of 26.3°C, compared with London's 21.4°C, a difference of 4.9°C. That is a noticeable step up in warmth, with summer clothing a sensible everyday choice rather than something reserved for a particularly warm afternoon.
How long is the flight from London?
The flight from London takes about 3 hours 54 minutes, putting Mykonos within short-haul reach. If you want warm sea temperatures without a long-haul flight, August fits that brief; the main weather trade-off is the lack of cooler nights.
Is August a good month to choose for Mykonos?
Yes, if your priorities are warmth, swimming and dry weather. August sits alongside July and June among the best months here for weather. It is also the warmest month, so it is less suited to travellers who particularly value cool evenings.
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