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Lake Tazawa

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Lake Tazawa Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Lake Tazawa year round climate

  • Spring (March–May): 39–59°F on average, the climate gradually warms, with moderate rainfall, suitable for enjoying flowers and hiking. Common activities: flower viewing, hiking. Recommended clothing: light jacket, long-sleeved shirt, comfortable shoes.
  • Summer (June–August): 68–79°F on average, the climate is warm and humid, with more rainfall, especially in July, which is the rainiest month. Common activities: lakeside walks, boating, escaping the heat. Recommended clothing: light and breathable clothing, sun hat, rain gear.
  • Autumn (September–November): 57–72°F on average, the climate is pleasantly cool, with decreasing rainfall. Common activities: maple leaf viewing, mountain climbing, photography. Recommended clothing: light jacket, long-sleeved shirt, comfortable shoes.
  • Winter (December–February): -32–34°F on average, the climate is cold, with a lower probability of snowfall, but temperature changes should be noted. Common activities: skiing (depending on actual snowfall), onsen experience. Recommended clothing: warm jacket, hat, scarf, gloves.

Lake Tazawa climatological average

Annual average temperature: approx. 54.1°F / Annual rainfall: approx. 2218 mm / Summer humidity: 70%–80% / Rainiest month: July

Lake Tazawa monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
31.8°F
148.1
February
32.7°F
93
March
39.9°F
111.6
April
51.6°F
117
May
59.5°F
128.5
June
68.2°F
187.2
July
76.1°F
324.8
August
79.7°F
322.2
September
72.1°F
235.1
October
57.4°F
160.8
November
46.8°F
214.7
December
34.3°F
175.5

Lake Tazawa weather for the next seven days

12/16
Tuesday
Heavy rain
41.4°F/35.8°F
12/17
Wednesday
Patchy rain nearby
38.8°F/33.2°F
12/18
Thursday
Cloudy
40.1°F/29.6°F
12/19
Friday
Partly Cloudy
46.8°F/29.2°F
12/20
Saturday
Partly Cloudy
49°F/31.8°F
12/21
Sunday
Sunny
53.3°F/38.1°F
12/22
Monday
Moderate rain
57.4°F/42.7°F

Lake Tazawa Frequently Asked Questions and Useful Information for Travel

Is Lake Tazawa worth visiting?

Lake Tazawa is absolutely worth visiting. It holds the distinction of being the deepest lake in Japan, reaching a depth of 423.4 meters. The surface of the lake mesmerizes with its shifting hues, ranging from brilliant lapis lazuli to azure and indigo. Visitors can enjoy the waters by taking a relaxing cruise on a sightseeing boat or opting for more active pursuits like paddle boating, canoeing, kayaking, or SUP.

Can you swim in Lake Tazawa?

Yes, you can swim in Lake Tazawa. The lake is fed by numerous river systems, contributing to some of the purest waters in Japan. During the summer months, the beach area becomes a popular spot for swimming and engaging in other water activities such as pedal boating and paddle-boarding.

How cold does Lake Tazawa get in winter?

Due to its impressive depth of 423.4 meters, Lake Tazawa never freezes, even in the depths of winter. This allows for unique snowy vistas where the scarlet tinted water dramatically contrasts with the white snow blanketing the surrounding mountains and lakeside.

What are the best ways to enjoy Lake Tazawa's waters?

You can enjoy Lake Tazawa's waters in several ways. Take a leisurely cruise on a sightseeing boat for panoramic views of the stunning scenery. For a more active experience, rent a paddle boat, canoe, kayak, or SUP to explore the lake at your own pace and get closer to its vibrant blue waters.

What makes Lake Tazawa unique in Japan?

Lake Tazawa's uniqueness stems from its status as the deepest lake in Japan, plunging to 423.4 meters. Its pristine waters display a remarkable spectrum of blues, from lapis lazuli to indigo, and it famously never freezes due to its immense depth, offering captivating scenery year-round.