Your January weather guide
CoolWeather in Mykonos in January
Mykonos in January suits a cool-weather break, not a winter sun holiday built around swimming. Average afternoons reach 13°C and nights fall to around 10°C, with about 11 rainy days across the month. It is milder than London, but you will still need layers and waterproofs. Go if you are happy to fit outdoor time around the weather; choose another month if warmth and long spells by the sea are the main reason for travelling.
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
- 13.1°C
- 9 in 10 days stay below 16°C
- Average night-time low
- 10.4°C
- coldest 10% of nights: 7°C or lower
- Compared with London
- +5.7°C
- London averages 7.4°C in January
- Sea temperature
- 15.8°C
- year to year: 15°C to 17°C
- Sunshine per day (est.)
- 4.5h
- 46% of 9.7 h of daylight
- Rainy days (1 mm+)
- 11
- 75 mm over the month
- Humidity
- 71%
- Days over 25°C
- 0%
- none over 30°C
- Record high 1991-2020
- 19.4°C
- 2010-01-01
- Record low 1991-2020
- 2.7°C
- 2004-01-22
- 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 January compares
January is the 12th warmest month of the year in Mykonos and ranks 89th of 134 destinations we compare for January - see where else is hot in January. Within Greece it is 26th of 44 (Greece in January). Against London's average high of 7.4°C in January, Mykonos is 5.7°C warmer by day and 8.2°C warmer at night.
Daytime and night-time in January
The typical January day in Mykonos peaks at 13.1°C, but that is an average: the warmest 10% of days reach 16.1°C or more. Days over 25°C are rare. Nights average 10.4°C; one night in ten drops to 6.9°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest January day here reached 19.4°C (2010-01-01) and the coldest night 2.7°C (2004-01-22).
Rain in January
Wet (more than 8 rainy days): about 11 days with 1 mm or more, 75 mm in total. Year to year it varies a lot - the wettest January was 2004 with 195 mm, the driest 2007 with 11 mm. Humidity averages 71%.
Sea temperature in January
The sea averages 15.8°C - too cold for most (under 18°c). Depending on the year it ranges from 15.1°C to 16.5°C. For the warmest sea here, come in August (24.3°C).
Sunshine and daylight
Around 4.5 hours of sunshine a day (estimated from cloud cover), 9.7 hours of daylight: the sun rises about 07:32 and sets about 17:23 local time in mid-January. Average cloud cover is 53%.
Is January a good time to visit Mykonos?
January is not the strongest month here: cool days and frequent rain. The best months for Mykonos on our scoring are July, August, June; months averaging 25°C or more: Jul, Aug.
Mild afternoons, but little warmth for the beach
January is Mykonos's coldest month, so think light winter clothing rather than a summer wardrobe. The warmer days can reach 16°C or more, but colder nights drop to 7°C or below. A jumper, long trousers and a jacket give you more flexibility than relying on a mild afternoon to last into the evening. The sea averages 15.8°C, which is cold rather than merely bracing. For most travellers, that makes time beside the water more appealing than time in it. If comfortable swimming is central to your plans, January is a poor fit, even when the air feels pleasant in the sunshine.
Keep outdoor plans flexible
Rain is a meaningful part of the January trade-off, not something to dismiss when packing. Bring a waterproof outer layer and shoes you are comfortable wearing in wet conditions, and avoid making every day depend on being outside. There are about 4.5 hours of sunshine within 9.7 hours of daylight, so some brightness is realistic, but an all-day sunny outlook is not a sensible expectation. Use brighter spells for walks and time outdoors, keeping the rest of your plans adjustable. The month suits travellers who can enjoy a break without reliable beach weather; it is less convincing if you want to spend most of each day outside.
A little perspective
Mykonos through the year
January 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+ |
|---|---|---|---|---|---|---|---|
| JanuarySelected | 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% |
| 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 January
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Mykonos in January FAQs
Plain answers, grounded in the averages.
Is Mykonos hot in January?
Mykonos is cool in January: the average daytime high is 13.1°C and nights average 10.4°C. Days over 25°C are rare in January.
Can you swim in the sea in Mykonos in January?
The sea around Mykonos averages 15.8°C in January, 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 January?
Mykonos sees about 11 rainy days (1 mm or more) and 75 mm of rain in a typical January. The wettest January between 1991 and 2020 was 2004 (195 mm) and the driest was 2007 (11 mm).
How sunny is Mykonos in January?
Mykonos gets around 4.5 hours of sunshine a day in January out of 9.7 hours of daylight (estimated from average cloud cover).
How does Mykonos compare with the UK in January?
Mykonos is on average 5.7°C warmer than London by day in January (13.1°C against 7.4°C).
What is the hottest January on record in Mykonos?
Between 1991 and 2020 the hottest January day in Mykonos reached 19.4°C on 2010-01-01, and the coldest night dropped to 2.7°C on 2004-01-22.
How much warmer is Mykonos than London in January?
Mykonos has an average daytime high of 13.1°C, compared with London's 7.4°C - a difference of 5.7°C. That is a noticeable improvement, but it still means cool-weather dressing rather than dependable T-shirt weather.
How long is the flight from London?
The flight from London takes about 3 h 54 min, making Mykonos a short-haul option. That keeps the flying time relatively modest, but the January weather is better suited to a cool break than a trip for dependable warmth.
When should I go instead for a warmer holiday?
July, August and June are the strongest alternatives for a holiday focused on warmer weather. January is the island's coldest month, so it makes more sense for travellers who do not need heat or 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