United KingdomIsland
Inaccessible Island
14.6 km² rising to 511 m out of the Atlantic Ocean.
Satellite: Sentinel-2 cloudless 2016 by EOX (CC BY 4.0). Outline and points © OpenStreetMap contributors / Natural Earth. North up.
In numbers
14.6km²
Area
19km
Coastline
511m
Highest point
0
People
18°C
Warmest sea
February
2,981km
To the mainland
When to go to Inaccessible Island
Best to visit from January to March.
The sea is warmest in February (18 °C) and coolest in September (13 °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.
Island in Tristan Da Cunha archipelago
Inaccessible Island is an island in United Kingdom. It covers 14.6 km², with 19 km of coastline. Its highest point rises to 511 m. Nobody lives on it. The nearest mainland is 2,981 km away.
Getting there
- 2,981 km from the mainlanddistance to the nearest continental coast
- From January to Marchbest months to go (from 30 years of averages)
Plan the trip
Ferries, stays and things to do
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On the island
What you find on Inaccessible Island.
- 5beachesSalt Beach, Tom's Beach, Pig Beach and 2 more
- 5named peaksSwales Fell, Boulder Hill, Round Hill and 2 more
- 1volcanoesCairn Peak
Counted in OpenStreetMap, the map anyone can edit, inside the island's outline. A low number may only mean nobody has mapped it yet.
The shape of the land.
On average the island stands 304 m above the sea. 27 % of it is below 200 m.
- 11 %0–50 m
- 16 %50–200 m
- 66 %200–500 m
- 8 %500–1,000 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.
5 km
All outlines drawn to the same scale (Natural Earth and OpenStreetMap).
Month by month
The weather on the island.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Afternoon high (°C) | 18 | 18 | 18 | 17 | 16 | 14 | 14 | 13 | 13 | 13 | 15 | 16 |
| Night low (°C) | 16 | 17 | 16 | 16 | 14 | 12 | 12 | 11 | 11 | 12 | 13 | 15 |
| Sea (°C) | 18 | 18 | 18 | 17 | 16 | 15 | 14 | 13 | 13 | 14 | 15 | 16 |
| Rain (mm) | 79 | 71 | 100 | 126 | 142 | 143 | 120 | 92 | 111 | 108 | 85 | 99 |
| Wet days | 14 | 13 | 15 | 18 | 19 | 19 | 19 | 17 | 17 | 16 | 16 | 15 |
| Sun h/day | 8.1 | 7.4 | 6.1 | 4.9 | 3.6 | 3.1 | 3.4 | 4.3 | 5.3 | 6.5 | 7.5 | 7.6 |
| Wind (km/h) | 25 | 25 | 26 | 28 | 32 | 33 | 34 | 34 | 31 | 29 | 27 | 26 |
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 | −0.2 | −0.5 | −0.5 | −0.2 | +0.1 | −0.5 | −0.5 | −0.3 | +0.2 | +0.5 | −0.2 | +1.6 |
| 2021 | +1.9 | +1.4 | +0.8 | −0.5 | +0.3 | −0.8 | −0.2 | +0.4 | +0.7 | +0.8 | +1.3 | +1.9 |
| 2022 | +1.5 | +0.5 | ±0.0 | −0.2 | ±0.0 | +0.2 | −0.1 | −0.1 | −0.1 | −0.5 | +0.3 | +0.8 |
| 2023 | +0.5 | +0.5 | +0.6 | +1.3 | +1.5 | +1.0 | +0.8 | +0.5 | +0.6 | +0.2 | −0.1 | −0.7 |
| 2024 | +0.2 | +0.3 | −0.1 | +0.3 | −0.2 | +0.6 | +0.7 | +0.1 | +0.6 | +0.8 | +0.3 | −0.6 |
| 2025 | −0.1 | −0.4 | +0.5 | +0.7 | +0.3 | +0.2 | +0.6 | +0.9 | +0.8 | +0.9 | +1.1 | +1.5 |
+1 warmer than usual −1 cooler than usual
Photos
Seen by visitors.
About these numbers
| Names, area, population | Wikidata (Q914225) · 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 |
Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.
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