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Iya Valley

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Iya Valley Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Iya Valley year round climate

  • Spring (March–May): Average 51–67°F, mild climate but with relatively high rainfall, especially in April. Common activities: Hiking, flower viewing. Recommended clothing: Light jacket, long-sleeved clothing, rain gear.
  • Summer (June–August): Average 75–84°F, hot and humid, frequent rainfall, with the most rain in June. Common activities: Playing in streams, visiting summer resorts. Recommended clothing: Light and breathable clothing, sun hat, rain gear.
  • Autumn (September–November): Average 67–80°F, comfortable and pleasant climate, rainfall gradually decreasing. Common activities: Autumn leaves viewing, hiking. Recommended clothing: Light jacket, long-sleeved clothing.
  • Winter (December–February): Average 41–45°F, low temperature, relatively dry, low rainfall. Common activities: Hot spring experience, enjoying winter scenery. Recommended clothing: Warm jacket, hat, scarf, gloves.

Iya Valley climatological average

Annual average temperature: approx. 63.3°F / Annual rainfall: approx. 1621 mm / Summer humidity: 70%–80% / Rainiest month: June

Iya Valley monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
41.2°F
27
February
43.5°F
72.3
March
51.6°F
131.3
April
62.1°F
148.7
May
67.6°F
181.3
June
75.2°F
241.7
July
83.5°F
221.7
August
84.9°F
211.7
September
81°F
149.3
October
67.1°F
113
November
57.7°F
94.3
December
45.1°F
28.7

Iya Valley weather for the next seven days

10/3
Saturday
Sunny
78.7°F/62.1°F
10/4
Sunday
Overcast
69.3°F/63.5°F
10/5
Monday
Moderate rain
64.1°F/62.8°F
10/6
Tuesday
Sunny
70.9°F/64.5°F
10/7
Wednesday
Sunny
76.1°F/63°F
10/8
Thursday
Patchy rain nearby
75.3°F/63.3°F
10/9
Friday
Sunny
75.1°F/62.9°F

Iya Valley Frequently Asked Questions and Useful Information for Travel

How do I get to Iya Valley, Japan?

The Iya Valley can be accessed via Awa-Ikeda and Oboke stations along the train line between Okayama and Kochi. Hourly JR Nampu limited express trains travel directly from Okayama (1.5 hours, about 4000 yen one way) and Kochi (1 hour, about 3000 yen one way).

How much time should I spend in Iya Valley?

To see just the main sights of Oboke and Nishi-Iya, it takes about 2 to 4 hours. If looking to explore secluded points in Oku-Iya, it would require 5 to 7 hours.

Can you swim in Iya Valley?

Rivers and gorges run through the valleys, offering opportunities for a refreshing swim. The clear turquoise water runs down from the mountains and is fresh and clean, though it can be very cold!

What are the main villages of Iya Valley?

The Iya Valley was formerly divided into two designated villages, East Iya (東祖谷山村) and West Iya (西祖谷山村).

What are the must-see attractions in Iya Valley?

Must-see attractions in Iya Valley include the iconic Kazurabashi vine bridges, the picturesque Ochiai Village, and the dramatic Oboke Gorge. Exploring these remote and beautiful areas offers a unique glimpse into traditional Japanese rural life.