Greece
Satellite: Sentinel-2 cloudless 2016 by EOX (CC BY 4.0). Outline and points © OpenStreetMap contributors / Natural Earth. North up.
In numbers
99.0km²
Area
121km
Coastline
356m
Highest point
Mount Kakovolo
25°C
Warmest sea
August
34km
To the mainland
When to go to Kythnos
Best for the beach from July to September.
The sea is warmest in August (25 °C) and coolest in February (15 °C). Comfortable swimming (21 °C or more): from June to October.
Averages 1991–2020. Sea: NOAA OISST, the water within 35 km of the coast. Air, rain and sun: NASA POWER. Best months weigh warm afternoons (23–30 °C), sea of 24 °C or more and few wet days.
Greek cyclades island
Kythnos is an island in Greece. It covers 99.0 km², with 121 km of coastline. Its highest point, Mount Kakovolo, rises to 356 m. The nearest mainland is 34 km away.
Getting there
- Athens Eleftherios Venizelos International Airport (ATH)nearest airport with scheduled flights · 74 km in a straight lineCar hire at ATH airport (Spata-Artemida)Discover Cars · Affiliate link↗
- FerriesKythnos - Serifos, Kythnos - Kea, Syros - Kythnos, Piraeus - Kythnos
- 34 km from the mainlanddistance to the nearest continental coast
- From July to Septemberbest months to go (from 30 years of averages)
Plan the trip
Ferries, stays and things to do
Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.
On the island
What you find on Kythnos.
- 68beachesAgios Sostis, Agios Ioannis, Apokrysi and 65 more
- 4lighthousesAkrotiri Agios Dimitrios and 3 more
- 3ferry terminalsKythnos
- 2marinasLimin Loutra
- 3castles and fortsBryokastro, Orias, Castle of Kythnos
- 8ruins and archaeological sitesVryokastro, Middle plateau and 6 more
- 1dive centresAqua Team
- 11waymarked walking routesKythnos Trail 01, Kythnos Trail 02-1, Kythnos Trail 02-2 and 8 more
- 33hotels, guesthouses and apartments
- 45restaurants, cafés and bars
Counted in OpenStreetMap, the map anyone can edit, inside the island's outline. A low number may only mean nobody has mapped it yet.
Cross-checked with our atlases
Kythnos in our other atlases
Everything Coastya, Peakyas, Lakeyas and Cascadyas know about what lies inside Kythnos, each with its own numbers.
3mountainsPeakyas
Highest point
356m
Mount Kakovolo
according to Peakyas
3 mountains
on Peakyas, the mountain atlas
- Mount Kakovolo356m
- Oros Profitis Ilias
- Oros Kakovoulo
The shape of the land.
On average the island stands 121 m above the sea. 83 % of it is below 200 m.
- 21 %0–50 m
- 62 %50–200 m
- 17 %200–500 m
Share of the island's area in each altitude band, from the Copernicus DEM (30 m, read at 30–240 m on large islands).
Size, for real
Next to islands you may know.
10 km
All outlines drawn to the same scale (Natural Earth and OpenStreetMap).
Towns on the island
- Kýthnosno census figure
Month by month
The weather on the island.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Afternoon high (°C) | 14 | 14 | 15 | 17 | 21 | 25 | 27 | 28 | 25 | 22 | 18 | 15 |
| Night low (°C) | 12 | 12 | 13 | 14 | 18 | 22 | 24 | 25 | 23 | 20 | 16 | 13 |
| Sea (°C) | 15 | 15 | 15 | 16 | 18 | 22 | 24 | 25 | 24 | 22 | 19 | 17 |
| Rain (mm) | 93 | 77 | 58 | 30 | 20 | 10 | 6 | 6 | 27 | 57 | 81 | 101 |
| Wet days | 14 | 13 | 10 | 6 | 5 | 2 | 1 | 1 | 5 | 8 | 12 | 14 |
| Sun h/day | 3.8 | 4.7 | 6.8 | 8.6 | 10.2 | 12.0 | 12.3 | 11.5 | 9.3 | 6.9 | 4.9 | 3.4 |
| Wind (km/h) | 24 | 24 | 22 | 19 | 16 | 16 | 20 | 22 | 20 | 22 | 22 | 24 |
Averages 1991–2020 for the ~55 km NASA POWER cell over the island; the sea from NOAA OISST.
Recent years
Warmer and cooler years at sea.
Each month's sea temperature compared with its 1991–2020 average, in degrees.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020 | +0.5 | +0.5 | +0.3 | +0.2 | +0.7 | +0.4 | −0.5 | +0.2 | +0.7 | +1.5 | +0.5 | +0.7 |
| 2021 | +1.5 | +1.3 | +0.9 | +0.7 | +0.9 | +1.3 | +1.0 | +1.1 | +0.5 | ±0.0 | +0.1 | +0.3 |
| 2022 | +1.0 | +0.7 | +0.4 | +0.4 | +0.6 | −0.3 | −0.8 | +0.1 | +1.1 | −0.1 | −0.3 | +0.8 |
| 2023 | +1.5 | +0.8 | +0.6 | +0.5 | −0.5 | −0.5 | +1.4 | +1.6 | +0.4 | +0.7 | +2.2 | +1.7 |
| 2024 | +1.9 | +0.8 | +1.1 | +1.2 | +0.2 | +0.6 | +0.5 | +1.5 | +1.8 | +1.6 | +0.7 | +1.6 |
| 2025 | +1.1 | +1.1 | +0.8 | +0.1 | −0.1 | −0.5 | +0.7 | +0.5 | +0.5 | +0.7 | +1.8 | +1.7 |
+1 warmer than usual −1 cooler than usual
Photos
Seen by visitors.
About these numbers
| Names, area, population | Wikidata (Q739779) · CC0 |
|---|---|
| Outline | © OpenStreetMap contributors · ODbL |
| Sea temperature | NOAA OISST v2.1 · 1991–2020 |
| Climate | NASA POWER · 1991–2020 |
| Relief, 3D model | Copernicus DEM GLO-30 · © DLR e.V., © Airbus Defence and Space GmbH, Copernicus/ESA |
| Beaches, ports, lighthouses, trails | © OpenStreetMap contributors · ODbL |
| Towns | GeoNames · CC BY 4.0 |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
| Beaches, mountains, lakes and waterfalls | Peakyas — Wikidata · CC0; © OpenStreetMap contributors · ODbL; GeoNames · CC BY 4.0 |
Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.
The family
Do you prefer beaches, lakes, mountains, waterfalls, islands, rivers or canyons?
Same idea, other landscapes: field atlases built on open data, month by month, in seven languages.
beaches
Find your beach: sea temperature, sun and swimming month by month.Visit 
lakes
Every lake on Earth: water temperature, ice, depth and the shore.Coming soonVisit mountains
Every summit in 3D: summit weather, the 0 °C line, huts and trails.Visit 
waterfalls
Every waterfall: height, flow month by month and when it roars.Coming soonVisit 
islands
Every island from the sea up: size, sea temperature, ferries and 3D.You are here
rivers
Every river from source to sea: the journey, the flow and the basin in numbers.Visit 
canyons
Every canyon cut to scale: depth to the floor, rim and floor temperatures, trails and viewpoints.Visit