Kosaka Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Kosaka.
Climate overview of Kosaka
Kosaka, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 27°C (81°F) in August, while winters cool to 1°C (34°F) in January.
With around 1532 mm (60 in) of annual rain/snowfall, Kosaka has a notably wet climate. However, this rain/snowfall is not evenly distributed, the city has warm summers and very cold winters. The wettest month is August. The sunniest month is May, with 6.6 hours of sunshine per day on average.
Kosaka Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Kosaka - and find the best time to visit.
Monthly Temperature in Kosaka
Depending on the time of the year, temperatures range from comfortable to very cold in Kosaka. Average daytime temperatures reach a comfortable 27°C (81°F) in August. In January, the coolest month of the year, temperatures drop to a very cold 1°C (34°F).
At night, temperatures range from around 19°C (66°F) in August to -7°C (19°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Kosaka
Kosaka has a relatively rain/snowy climate with high precipitation levels, averaging 1532 mm (60 in) of rain/snowfall annually. Kosaka experiences moderate seasonal variation in rainfall, with monthly averages ranging from 177 mm (7 in) in August, the wettest month, and 97 mm (3.8 in) in January, the driest month. For more details, please visit our Kosaka Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Kosaka
Kosaka experiences moderate variation in sunshine hours across the seasons. With 6.6 hours daily sunshine in May, it dips to 4.2 hours in December, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Kosaka by Month
The relative humidity is high throughout the year in Kosaka.
The city experiences its highest humidity in July, reaching 83%. In March, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Kosaka
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: April and May
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Kosaka
What is the best time to visit Kosaka?
June, July, August and September typically offer the most optimal weather in Kosaka. In contrast, January, February, March, April, November and December tend to have less optimal conditions. Kosaka has warm summers and very cold winters.
What temperatures can I expect in Kosaka?
Daytime highs range from 1°C (34°F) in January to 27°C (81°F) in August. Nighttime lows range from -7°C (19°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Kosaka get?
Annual rainfall is around 1532 mm (60 in). August is the wettest month with 177 mm (7 in), while January is the driest with 97 mm (3.8 in).
How sunny is Kosaka?
Kosaka receives around 1,866 hours of sunshine per year. May is the sunniest month with 197 hours, while December is the cloudiest with just 125 hours.
Kosaka 3-Day Forecast
Kosaka on the map
Kosaka is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Osaka
32°C (90°F) Tokyo30°C (86°F) Naha
30°C (86°F) Kyoto31°C (88°F) Hakone28°C (82°F) Hakuba26°C (79°F) Sapporo24°C (75°F) Niseko24°C (75°F) 
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