Aso Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Aso.
Climate overview of Aso
Aso, Kumamoto, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 31°C (88°F) in August, while winters cool to 9°C (48°F) in January.
The city receives considerable rain/snowfall, with around 1994 mm (79 in) annually. June is the wettest month. It has a distinct rainy season from May to September. The sunniest month is August, with 6.9 hours of sunshine per day on average.
Aso Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Aso — and find the best time to visit.
Monthly Temperature in Aso
Depending on the time of the year, temperatures range from very warm to chilly in Aso. Typically, average maximum daytime temperatures range from a very warm 31°C (88°F) in August to a chilly 9°C (48°F) in the coolest month, January.
Nights vary from 22°C (72°F) in August to around -1°C (30°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Aso
Aso has a relatively rain/snowy climate with high precipitation levels, averaging 1994 mm (79 in) of rain/snowfall annually. The climate in Aso shows significant variation throughout the year. Expect heavy rainfall in June, the wettest month, with an average of 413 mm (16 in) of precipitation over 19 rainy days.
In contrast, the driest month December offers drier and sunnier days, with around 73 mm (2.9 in) of rainfall over 16 rainy days. For more details, please visit our Aso 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 Aso
Aso offers a pleasant mix of sunny and slightly overcast days. The difference in sunshine hours between August (6.9 hours daily) and June (4.4 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 Aso by Month
The relative humidity is high throughout the year in Aso.
The city experiences its highest humidity in June, reaching 76%. In April, the humidity drops to its lowest level at 65%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Aso
Rainfall during this time ranges from 84 mm (3.3 in) in November to 109 mm (4.3 in) in October. This means you can expect a mix of sunny days and occasional showers.
The rainy season falls during April, May, June, July, August and September, bringing heavy precipitation. Wondering where to travel based on your weather preferences? Our recommendation tool helps you find destinations with your ideal climate conditions. Use our weather planner to find your perfect destination.
Frequently asked questions about the climate in Aso
What is the best time to visit Aso?
May and October typically offer the most optimal weather in Aso. In contrast, January, February, June and July tend to have less optimal conditions. Aso has a distinct rainy season from May to September.
What temperatures can I expect in Aso?
Daytime highs range from 9°C (48°F) in January to 31°C (88°F) in August. Nighttime lows range from -1°C (30°F) to 22°C (72°F). Temperatures vary considerably through the year.
How much rain does Aso get?
Annual rainfall is around 1994 mm (79 in). June is the wettest month with 413 mm (16 in), while December is the driest with 73 mm (2.9 in).
How sunny is Aso?
Aso receives around 2,014 hours of sunshine per year. August is the sunniest month with 208 hours, while June is the cloudiest with just 131 hours. Overall, Aso enjoys abundant sunshine.
Aso 3-Day Forecast
Aso 3-Day Forecast
Aso on the map
Aso is highlighted — select any city to see its climate.
Popular this month
Where to go in June — average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
Walk the 88 temple circuit
We recommend walking the 88 temple circuit from April til October. Although June, July and August can be a bit wet, hot and humid.
The famous bamboo forests of Arashiyama
The famous bamboo forests of Arashiyama lie just outside the city center of Kyoto and is unique in the world. If you look at photos of this bamboo forest, it looks like you have landed in a fairy-tale world.
10 reasons why you should visit Japan in winter
Here are 10 reasons why you should plan a winter trip to Japan. During this period, popular sights are less busy and prices for flights and hotels much cheaper.