Sweden
Satellite: Sentinel-2 cloudless 2016 by EOX (CC BY 4.0). Outline and points © OpenStreetMap contributors / Natural Earth. North up.
In numbers
138km²
Area
163km
Coastline
113m
Highest point
Vetteberget
14,953
People
18°C
Warmest sea
August
When to go to Tjörn
Best to visit from July to August.
The sea is warmest in August (18 °C) and coolest in February (3 °C). The water never reaches 21 °C: bring a wetsuit.
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.
Swedish island
Tjörn is an island in Sweden. It covers 138 km², with 163 km of coastline. Its highest point, Vetteberget, rises to 113 m. About 14,953 people live on it.
Getting there
- Trollhättan-Vänersborg Airport (THN)nearest airport with scheduled flights · 54 km in a straight lineCar hire at AAL airport (Aalborg)Discover Cars · Affiliate link↗
- FerriesÅstol-Rönnäng, Rönnäng-Tjörnekalv, Kyrkesund-Härön, Tjörnekalv-Dyrön
- From July to Augustbest 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 Tjörn.
- 15beachesKåreviks badplats and 14 more
- 7viewpointsSankt Olovs valar and 6 more
- 4lighthousesNorra Kyrkesund övre, Södra Kyrkesund nedre, Södra Kyrkesund övre and 1 more
- 3ferry terminalsRönnängs brygga, Kyrkesunds brygga, Härön
- 19marinasAlmösunds Marina, Engewikens Båtförening, Rönnängs småbåtshamn and 16 more
- 2named peaksVetteberget, Valeberget
- 9ruins and archaeological sitesGullhögen, Pilane gravfält, Styrdalen Valla and 6 more
- 7waymarked walking routesSundsbyleden, Solklinten, Rådjursstigen and 4 more
- 1campsitesHav & Logi
- 26hotels, guesthouses and apartments
- 22restaurants, 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
Tjörn in our other atlases
Everything Coastya, Peakyas, Lakeyas and Cascadyas know about what lies inside Tjörn, each with its own numbers.
3beaches and covesCoastya
2mountainsPeakyas
1lakeLakeyas
Highest point
116m
Vetteberget
according to Peakyas
Largest lake
0.18km²
Bös tjärn
12 m deep · according to Lakeyas
Warmest lake
22.8°C
Bös tjärn
surface water, warmest month · according to Lakeyas
Beach with the warmest sea
18.0°C
Bö Kile
sea in the warmest month · according to Coastya
3 beaches
on Coastya, the beach atlas
- Bö Kilecove18.0°C
- Bräcke Kilecove18.0°C
- Viks Kilecove17.8°C
1 lakes
on Lakeyas, the lake atlas
- Bös tjärn12 m deep0.18km²
Lakeyas is coming soonOpen Lakeyas ↗
The shape of the land.
On average the island stands 30 m above the sea. 100 % of it is below 200 m.
- 81 %0–50 m
- 19 %50–200 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
- Skärhamn3,495 people
- Höviksnäs1,750 people
- Rönnäng1,551 people
- Myggenäs1,460 people
Month by month
The weather on the island.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Afternoon high (°C) | 1 | 1 | 4 | 10 | 14 | 18 | 20 | 20 | 16 | 11 | 6 | 3 |
| Night low (°C) | -2 | -2 | -1 | 3 | 8 | 12 | 14 | 14 | 11 | 6 | 3 | 0 |
| Sea (°C) | 4 | 3 | 3 | 6 | 11 | 14 | 17 | 18 | 15 | 12 | 9 | 6 |
| Rain (mm) | 89 | 65 | 58 | 55 | 66 | 88 | 93 | 100 | 83 | 107 | 96 | 94 |
| Wet days | 15 | 12 | 11 | 10 | 12 | 14 | 14 | 16 | 14 | 16 | 16 | 16 |
| Sun h/day | 0.4 | 1.7 | 4.9 | 7.2 | 9.0 | 10.0 | 9.1 | 7.4 | 5.5 | 2.7 | 0.6 | 0.1 |
| Wind (km/h) | 15 | 14 | 13 | 12 | 12 | 12 | 12 | 12 | 14 | 15 | 15 | 15 |
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 | +2.3 | +2.6 | +2.3 | +1.5 | −0.4 | +2.5 | −0.3 | +0.5 | +0.6 | +1.3 | +2.6 | +2.2 |
| 2021 | +0.6 | −1.8 | +1.6 | +0.5 | −0.5 | +0.6 | +1.8 | −0.2 | +0.7 | +1.4 | +1.6 | +0.2 |
| 2022 | +1.3 | +2.4 | +1.6 | +1.0 | +0.4 | +0.2 | −0.2 | +0.5 | +0.8 | +1.0 | +1.9 | +0.4 |
| 2023 | +1.8 | +1.7 | +0.9 | +0.7 | +0.6 | +2.1 | −0.8 | −0.9 | +1.5 | +1.2 | −0.2 | −0.5 |
| 2024 | −0.4 | +1.3 | +1.1 | +0.8 | +2.7 | +0.7 | −0.2 | −0.2 | +1.4 | +1.1 | +1.1 | +1.2 |
| 2025 | +1.4 | −0.2 | +1.4 | +2.1 | +0.8 | −0.5 | +1.4 | −0.2 | +1.3 | +1.3 | +1.1 | +1.6 |
+1 warmer than usual −1 cooler than usual
Photos
Seen by visitors.
Nearby
More islands nearby.
Denmark
Norway
About these numbers
| Names, area, population | Wikidata (Q1521279) · 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 | Coastya, Peakyas, Lakeyas — Wikidata · CC0; © OpenStreetMap contributors · ODbL; GeoNames · CC BY 4.0; NOAA OISST; HydroLAKES (Messager et al. 2016) · CC BY 4.0, LakeTEMP (Korver et al. 2024) · 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