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Lake Suwa

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Lake Suwa Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Lake Suwa year round climate

  • Spring (March–May): Average 5.6–15.3°C, the climate gradually changes from cold to warm, with increasing rainfall. There is still a chance of snowfall in March, cherry blossoms begin to bloom in April, and May is already full of spring. Common activities: cherry blossom viewing, hiking, lake sightseeing. Recommended clothing: spring jacket, comfortable casual wear, and it is recommended to bring rain gear.
  • Summer (June–August): Average 19.8–25.5°C, the climate is warm and humid, with more rainfall, especially the most rainfall in June. Common activities: water activities, camping, outdoor barbecues. Recommended clothing: light and breathable clothing, sun hat, and rain gear.
  • Autumn (September–November): Average 8.3–22.4°C, the climate is cool and comfortable, with gradually decreasing rainfall. September still has more rainfall, and it starts to become dry from October. Common activities: maple leaf viewing, hiking, hot spring bathing. Recommended clothing: light jacket, long-sleeved shirt, and comfortable casual shoes.
  • Winter (December–February): Average -0.6–2.1°C, the climate is cold and dry, with little rainfall, and there may be snowfall. Common activities: skiing, hot spring bathing, and enjoying the winter lake scenery. Recommended clothing: warm jacket, beanie, gloves, scarf.

Lake Suwa climatological average

Annual average temperature: approx. 12.4°C / Annual rainfall: approx. 1421 mm / Summer humidity: 70%–80% / Rainiest month: June

Lake Suwa monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-0.6°C
15
February
0.4°C
63.7
March
5.6°C
107.7
April
12.2°C
126.5
May
15.3°C
166.1
June
19.8°C
218.8
July
24.5°C
207.3
August
25.5°C
115.2
September
22.4°C
191.7
October
13.8°C
101.4
November
8.3°C
84.8
December
2.1°C
23.1

Lake Suwa weather for the next seven days

1/20
Tuesday
Moderate snow
5.2°C/-7°C
1/21
Wednesday
Light freezing rain
-0.2°C/-8.1°C
1/22
Thursday
Light freezing rain
-2°C/-9.2°C
1/23
Friday
Moderate or heavy snow showers
-0.1°C/-10.2°C
1/24
Saturday
Moderate or heavy snow showers
-0.8°C/-10.4°C
1/25
Sunday
Light freezing rain
0.4°C/-14.2°C
1/26
Monday
Sunny
3°C/-15.8°C

Lake Suwa Frequently Asked Questions and Useful Information for Travel

What is the 'God's Crossing' phenomenon at Lake Suwa?

The stunning natural phenomenon called omiwatari, or 'God's crossing', occurs when a jagged ridge forms in the ice on Lake Suwa. This happens when the ice surface stretches due to temperature differences between day and night.

Is Suwa, Japan a worthwhile destination to visit?

Suwa, Japan offers a wealth of activities for nature lovers, castle enthusiasts, hot spring aficionados, and shrine visitors. It's also a must-visit for fans of Makoto Shinkai's film 'Your Name,' as Lake Suwa inspired the fictional Lake Itomori.

What is the historical significance of the miwatari phenomenon at Lake Suwa?

Lake Suwa is renowned for the miwatari phenomenon, now often referred to as 'God's Crossing' (o-miwatari). This natural occurrence involves large cracks forming across the frozen lake's surface during winter.

Can Mount Fuji be seen from Lake Suwa?

Yes, Mount Fuji can be clearly viewed from the Suwa Basin, even though it is surrounded by mountains. This unique alignment is attributed to the powerful pressure from the Philippine Sea Plate.

What are the main attractions around Lake Suwa?

Lake Suwa offers diverse attractions including natural wonders like the omiwatari ice phenomenon, historic Suwa Grand Shrine, and scenic views. The surrounding Suwa Basin also provides opportunities for nature walks and enjoying hot springs.