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Kanmon Straits

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Kanmon Straits Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Kanmon Straits year round climate

  • Spring (March–May): Average 11.8–19.0°C, mild climate, moderate rainfall, occasional showers. Common activities: Hiking, flower viewing. Recommended clothing: Light jacket, long-sleeved shirt.
  • Summer (June–August): Average 23.0–28.9°C, hot and humid, higher rainfall, especially in July. Common activities: Beach activities, resort visits. Recommended clothing: Light and breathable clothing, sun protection clothing, rain gear.
  • Autumn (September–November): Average 20.1–26.5°C, comfortable and pleasant climate, gradually decreasing rainfall. Common activities: Maple leaf viewing, outdoor activities. Recommended clothing: Light jacket, long-sleeved shirt.
  • Winter (December–February): Average 7.4–9.1°C, lower temperatures, dry and less rain. Common activities: Indoor activities, hot spring trips. Recommended clothing: Warm jacket, sweater, scarf.

Kanmon Straits climatological average

Annual average temperature: approx. 17.7°C / Annual rainfall: approx. 1869 mm / Summer humidity: 70%–80% / Rainiest month: July

Kanmon Straits monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
7.4°C
73.5
February
7.8°C
98.6
March
11.8°C
121.8
April
15.9°C
165.2
May
19°C
134.3
June
23°C
213.6
July
27.7°C
438.4
August
28.9°C
149.8
September
26.5°C
202.5
October
20.1°C
89.2
November
15.5°C
129.7
December
9.1°C
52.8

Kanmon Straits weather for the next seven days

9/24
Thursday
Overcast
27.7°C/18.3°C
9/25
Friday
Overcast
24.7°C/18.2°C
9/26
Saturday
Mist
21.8°C/19.6°C
9/27
Sunday
Light rain shower
21.1°C/20°C
9/28
Monday
Patchy rain nearby
24.7°C/20.1°C
9/29
Tuesday
Light rain shower
21.7°C/18.3°C
9/30
Wednesday
Light rain shower
19.8°C/17.1°C

Kanmon Straits Frequently Asked Questions and Useful Information for Travel

How deep is the Kanmon Strait?

The Kanmon Strait is approximately 12 meters deep. Countless generations of pilots and captains have braved its treacherous reefs and fierce currents of up to 11 knots (20.3 km/h).

Where is the Kanmon Strait located?

The Kanmon Strait is a narrow channel of water that separates the Japanese islands of Honshu and Kyushu. It connects the Sea of Japan and the Inland Sea, playing a vital role in maritime transportation.

What does 'Kanmon' mean in Japanese?

In Japanese, 'Kanmon' (関門) can mean 'barrier'.

What is Shimonoseki famous for regarding the Kanmon Straits?

Shimonoseki, located by the Kanmon Straits, is famous for fugu (pufferfish). Visitors can also find a variety of locally-caught seafood at the Karato Fish Market.

What are the key navigational challenges of the Kanmon Straits?

The Kanmon Straits present significant navigational challenges due to treacherous reefs and fierce currents that can reach up to 11 knots (20.3 km/h). At its narrowest point, the navigable width is only half a kilometer.