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Itoigawa

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Itoigawa Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Itoigawa year round climate

  • Spring (March–May): Average 7.1–16.7°C, mild climate, but early spring can be cold with occasional rainfall. Cherry blossoms may bloom in some areas between March and April. Common activities: Flower viewing (if available), hiking. Recommended clothing: Warm jacket, long-sleeved clothing, comfortable shoes.
  • Summer (June–August): Average 21.8–28.2°C, hot and humid climate with moderate rainfall. Common activities: Beach activities, mountain climbing (avoid afternoon thunderstorms). Recommended clothing: Light and breathable clothing, hat, sunscreen.
  • Autumn (September–November): Average 11.6–24.6°C, pleasant climate, but with heavier rainfall, so pay attention to weather changes. Common activities: Maple leaf viewing (depending on tree species), hiking. Recommended clothing: Comfortable long-sleeved clothing, light jacket, rain gear.
  • Winter (December–February): Average 2.5–4.9°C, cold climate with heavy rainfall and potential snowfall. Common activities: Skiing (check snow conditions), onsen experience. Recommended clothing: Thick warm clothing, waterproof jacket, hat, gloves, scarf.

Itoigawa climatological average

Annual average temperature: approx. 14.3°C / Annual rainfall: approx. 3101 mm / Summer humidity: 70%–80% / Rainiest month: December

Itoigawa monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
2.5°C
441.3
February
3°C
269.3
March
7.1°C
188.9
April
12.9°C
117.3
May
16.7°C
157.4
June
21.8°C
132.3
July
26.6°C
212
August
28.2°C
195.4
September
24.6°C
196.4
October
16.6°C
256.8
November
11.6°C
337.2
December
4.9°C
597

Itoigawa weather for the next seven days

3/17
Tuesday
Sunny
7.7°C/0.7°C
3/18
Wednesday
Patchy rain nearby
11.1°C/1.6°C
3/19
Thursday
Moderate rain
8.4°C/6.4°C
3/20
Friday
Patchy rain nearby
9.8°C/2.6°C
3/21
Saturday
Sunny
9.4°C/0.6°C
3/22
Sunday
Overcast
12.9°C/2.3°C
3/23
Monday
Patchy rain nearby
13°C/7.2°C

Itoigawa Frequently Asked Questions and Useful Information for Travel

Is Itoigawa worth visiting?

Itoigawa offers breathtaking views of the Northern Alps and the Sea of Japan. It's conveniently accessible from Tokyo via the Hokuriku Shinkansen in about two hours and provides diverse attractions for culture, history, and geology enthusiasts.

What is Itoigawa famous for?

Itoigawa is renowned for its jade, often found on its local beaches. The area also gives its name to the Itoigawa-Shizuoka Tectonic Line, a significant fault that marks the western edge of the Fossa Magna.

What is the history of Itoigawa?

Historical mentions of Itoigawa were largely forgotten until 1939, when jade was discovered in the Kotaki River. Archeological findings of jade artifacts from Itoigawa across Japan suggest a vibrant trade network active from 1,500 BC through the 5th century.

What is Itoigawa jade?

Itoigawa Jade is a special gem unique to Japan, cherished for its natural energy and as a memorial stone. It exists in two forms: jadeite (hard jade) and nephrite (soft jade), each with distinct scientific and cultural significance.

What geological features define Itoigawa?

Itoigawa is critically important geologically as it marks the Itoigawa-Shizuoka Tectonic Line, a major fault defining the Fossa Magna. This line influences the region's dramatic landscapes and its unique geological discoveries.