Smith Island (Japan)
Island Remote volcanic island south of Tokyo, uninhabited
Sumisu‑tō (Smith Island) is an uninhabited volcanic islet in the Izu-Bonin chain, known for sea cliffs and seabird colonies; visits are mainly by research vessels and passing yachts.
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How to Get to Smith Island (Japan) #
Smith Island is remote and typically not served by public ferries. Access is usually limited to research vessels or licensed charter boats from larger Izu islands (e.g., Miyake-jima or Hachijō-jima) or from the Tokyo marina fleet for scientific expeditions. Landing permissions often require coordination with Tokyo Prefectural authorities.
Tips for Visiting Smith Island (Japan) #
- Smith Island (Sumisu-to) is a dangerous volcanic rock-approach only with experienced boat operators and permission from local authorities.
- The island is a seabird refuge-landings are often not permitted to protect breeding grounds; observe from a safe offshore distance.
- Expect rough seas even in summer; bring marine-grade motion-sickness remedies and waterproof gear.
Best Time to Visit Smith Island (Japan) #
Summer months offer the highest chance of calm seas and visibility; strictly check local maritime advisories.
Summer (June-August)
June-August · 18°C-26°C (64°F-79°F)
The only realistic window for sea travel to remote Izu is in summer, though conditions remain changeable.
Late spring or early autumn
May, September · 16°C-24°C (61°F-75°F)
Less reliable for landings but slightly calmer sea conditions sometimes occur.
Weather & Climate near Smith Island (Japan) #
Climate
Temperature & Rainfall
Temperature Range
30°
Warmest Month
8°
Coldest Month
Monthly Conditions
January
Weather
0.5
UV Index
Moderate
10.2h daylight
February
Weather
0.8
UV Index
Moderate
10.9h daylight
March
Weather
1.2
UV Index
High
11.9h daylight
April
Weather
1.5
UV Index
High
12.8h daylight
May
Weather
1.7
UV Index
Very High
13.6h daylight
June
Weather
1.8
UV Index
Very High
14.0h daylight
July
Weather
2.3
UV Index
Extreme
13.8h daylight
August
Weather
2.2
UV Index
Extreme
13.1h daylight
September
Weather
1.8
UV Index
Very High
12.2h daylight
October
Weather
1.2
UV Index
High
11.3h daylight
November
Weather
0.7
UV Index
Moderate
10.4h daylight
December
Weather
0.5
UV Index
Moderate
10.0h daylight
