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Kanmon Straits

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Best time to visit Kanmon Straits

Data source：Meteostat
Last updated：2025-09

Weather in Kanmon Straits throughout the year

  • 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.

Weather in Kanmon Straits

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

Kanmon Straits weather by month

Month
Temperature (°C)
Rainfall (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

7-day weather forecast for Kanmon Straits

11/14
Saturday
Light rain
16.6°C/12°C
11/15
Sunday
Patchy rain nearby
18.8°C/15.2°C
11/16
Monday
Patchy rain nearby
19.2°C/13°C
11/17
Tuesday
Patchy rain nearby
17.3°C/13.4°C
11/18
Wednesday
Patchy rain nearby
17.6°C/12.3°C
11/19
Thursday
Patchy rain nearby
11.8°C/8.6°C
11/20
Friday
Patchy rain nearby
10.2°C/6.7°C

Kanmon Straits travel FAQs and useful info

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.