Kai Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Kai.
Climate overview of Kai
Temperatures in Kai, Yamanashi, Japan, vary greatly throughout the year. August is the hottest month at 27°C (81°F), while January is the coldest at 4°C (39°F).
The city receives considerable rain/snowfall, with around 1829 mm (72 in) annually. September is the wettest month. The most sunshine falls in January, with an average of 6.8 hours of daily sunshine.
Kai Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Kai — and find the best time to visit.
Monthly Temperature in Kai
The climate in Kai is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 27°C (81°F) in August to a chilly 4°C (39°F) in the coolest month, January.
Nights vary from 18°C (64°F) in August to around -7°C (19°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Kai
Kai has a notably wet climate with abundant precipitation, recording 1829 mm (72 in) of rain/snowfall per year. The climate in Kai shows significant variation throughout the year. Expect heavy rainfall in September, the wettest month, with an average of 232 mm (9.1 in) of precipitation over 19 rainy days.
In contrast, the driest month December offers drier and sunnier days, with around 70 mm (2.8 in) of snow/rainfall over 9 snowy/rainy days. For more details, please visit our Kai 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 Kai
Kai offers a pleasant mix of sunny and slightly overcast days. The difference in sunshine hours between January (6.8 hours daily) and September (4.7 hours daily) provides a bit of variety for visitors and residents.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Kai by Month
The relative humidity is high throughout the year in Kai.
The city experiences its highest humidity in July, reaching 73%. In February, the humidity drops to its lowest level at 54%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Kai
The wettest months are June, July, August, September and October, when precipitation is at its highest. Ready to plan your travels but need destination ideas? Our smart tool recommends places based on the climate conditions you prefer. Start planning with our destination weather tool.
Frequently asked questions about the climate in Kai
What is the best time to visit Kai?
May and August typically offer the most optimal weather in Kai. In contrast, January, February, March, October and December tend to have less optimal conditions.
What temperatures can I expect in Kai?
Daytime highs range from 4°C (39°F) in January to 27°C (81°F) in August. Nighttime lows range from -7°C (19°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Kai get?
Annual rainfall is around 1829 mm (72 in). September is the wettest month with 232 mm (9.1 in), while December is the driest with 70 mm (2.8 in).
How sunny is Kai?
Kai receives around 2,178 hours of sunshine per year. January is the sunniest month with 204 hours, while September is the cloudiest with just 142 hours. Overall, Kai enjoys abundant sunshine.
Kai 3-Day Forecast
Kai 3-Day Forecast
Kai on the map
Kai 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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