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Mashu Lake

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Mashu Lake Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Mashu Lake year round climate

  • Spring (March–May): Average -0.9–10.8°C, cold climate, rainy, and large temperature fluctuations. Common activities: Lake viewing; if weather permits, some light outdoor activities. Recommended clothing: Warm jacket, waterproof clothing, hat, scarf, gloves.
  • Summer (June–August): Average 14.5–20.7°C, cool climate, relatively high rainfall, and high humidity. Common activities: Hiking, lake viewing, photography. Recommended clothing: Light and breathable clothing, rain gear, sun protection clothing.
  • Autumn (September–November): Average 18.1–4.5°C, comfortable climate, but temperature drops rapidly, rainfall gradually decreases. Common activities: Autumn colors viewing, photography. Recommended clothing: Warm jacket, comfortable shoes.
  • Winter (December–February): Average -6.7–-3.2°C, cold climate, snowfall may be less, but low temperatures and strong winds. Common activities: Snow viewing (if snowfall); if weather permits, some ice activities. Recommended clothing: Heavy warm jacket, waterproof and windproof clothing, hat, scarf, gloves, warm boots.

Mashu Lake climatological average

Annual average temperature: approx. 7°C / Annual rainfall: approx. 1199 mm / Summer humidity: 70%–80% / Rainiest month: August

Mashu Lake monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-6.7°C
85.3
February
-6.5°C
46.7
March
-0.9°C
88.4
April
6.4°C
85.7
May
10.8°C
71.4
June
14.5°C
104.8
July
19.5°C
134.1
August
20.7°C
189.5
September
18.1°C
150.6
October
11.3°C
108.1
November
4.5°C
61.2
December
-3.2°C
73.5

Mashu Lake weather for the next seven days

12/18
Thursday
Light freezing rain
-2.2°C/-9.9°C
12/19
Friday
Partly Cloudy
-0.4°C/-8.8°C
12/20
Saturday
Patchy rain nearby
6.8°C/-3.7°C
12/21
Sunday
Heavy snow
-0.9°C/-1.9°C
12/22
Monday
Light snow
-0.9°C/-7.8°C
12/23
Tuesday
Light freezing rain
-2.6°C/-9.8°C
12/24
Wednesday
Heavy snow
0.6°C/-3.4°C

Mashu Lake Frequently Asked Questions and Useful Information for Travel

Is Lake Mashu worth visiting?

Mysterious Lake Mashu is worth a visit. The foggy Lake Mashu is also famous but on a clear day the blue of the sky is reflected on the lake's surface, creating a spectacular view. During the winter, only the Mashu First Observatory is available.

Where is Lake Mashu located?

Lake Mashū is an endorheic crater lake formed in the caldera of a potentially active volcano. It is located in Akan Mashu National Park on the island of Hokkaido, Japan. It has been called the clearest lake in the world.

What is the clearest lake in Hokkaido?

A mist-shrouded crater lake clear to its depths, with a volcano at its heart. Time stands still at pristine Lake Mashu, a caldera lake in Akan Mashu National Park. With its deep blue waters and steep crater walls, it truly is a special place to visit.

Where is Mount Mashu located?

Mount Kamui, also Kamuinupuri or Mount Mashū, a potentially active volcano, is a parasitic stratovolcano of the Mashū caldera located in the Akan National Park of Hokkaido, Japan.

What are the best viewpoints for Lake Mashu?

The primary viewpoints for Lake Mashu are the Mashu First Observatory and the Mashu Third Observatory, offering stunning panoramic views of the caldera lake. During winter, access may be limited to the Mashu First Observatory.