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Shinano River

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Shinano River Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Shinano River year round climate

  • Spring (March–May): Average 7.1–16.7°C, mild climate, but with relatively high rainfall, especially in March. Common activities: Flower viewing, hiking, but be aware of changing weather conditions. Recommended clothing: Light jacket, comfortable long pants and shoes.
  • Summer (June–August): Average 21.8–28.2°C, hot and humid, relatively low rainfall, but occasional heavy downpours. Common activities: Swimming, outdoor activities, but be aware of sun protection and rain. Recommended clothing: Light and breathable clothing, sun hat, rain gear.
  • Autumn (September–November): Average 16.6–24.6°C, pleasant climate, but with relatively high rainfall, especially in November. Common activities: Maple viewing, outdoor excursions, be aware of rain. Recommended clothing: Light jacket, comfortable long pants or skirt.
  • Winter (December–February): Average 2.5–4.9°C, cold and humid, very high rainfall, and possible snowfall. Common activities: Hot springs, indoor activities. Recommended clothing: Warm jacket, hat, scarf, gloves.

Shinano River climatological average

Annual average temperature: approx. 14°C / Annual rainfall: approx. 3101 mm / Summer humidity: 70%–80% / Rainiest month: December

Shinano River 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

Shinano River weather for the next seven days

4/8
Wednesday
Patchy rain nearby
10.9°C/2.6°C
4/9
Thursday
Patchy rain nearby
19°C/2.9°C
4/10
Friday
Moderate rain
15.1°C/9.6°C
4/11
Saturday
Patchy rain nearby
15.4°C/7.4°C
4/12
Sunday
Sunny
17.9°C/3.5°C
4/13
Monday
Patchy rain nearby
22°C/8°C
4/14
Tuesday
Patchy rain nearby
11.1°C/7.7°C

Shinano River Frequently Asked Questions and Useful Information for Travel

Why is the Shinano River important?

The Shinano River's flow and environment are vital, supporting the life and products of the vast areas within Niigata and Nagano Prefectures. The river supplies essential water for hydropower generation, irrigation for agriculture, industrial uses, and municipal water plants, underscoring its crucial role in regional development and daily life.

Where is the Shinano River located?

The Shinano River is located in Japan on the island of Honshu. It originates in the Japanese Alps and flows through the Nagano and Niigata prefectures, eventually emptying into the Sea of Japan. Its upper reaches are known as the Chikuma River.

How deep is the Shinano River?

At the Asahi Bridge, located 34.5 km from the river mouth, which serves as the official stream gauging location, the water surface width of the Shinano River is approximately 140 meters. The maximum depth recorded in the downstream part of the bridge was 9.37 meters.

Which is the biggest river in Japan?

The Shinano-gawa is recognized as the longest river in Japan, stretching 367 km. It originates in the high mountainous region of central Honshu Island, often referred to as the Japanese Alps. Its abundant waters flow towards the Echigo Plain, fostering extensive and rich rice paddy fields.

What are the main uses of Shinano River water?

The water from the Shinano River is crucial for multiple purposes, including generating hydropower, irrigating agricultural lands, supporting industrial activities, and supplying city water treatment plants. This multifaceted usage highlights the river's significance to the economy and well-being of the surrounding regions.