Climate Insights for Aso

The climate in Aso is temperate. The average annual temperature is 15°C and approximately 2083mm of precipitation falls per year. Aso receives a notable amount of rainfall throughout the year, including during its driest month. Aso is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, December, February, when temperatures can drop to 0°C. Light snow can occur between January and December.

Temperatures in Aso vary considerably across the year, with a 30°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 30°C and the mean temperature sits around 26°C. The coldest month is January, when overnight lows fall to 0°C and the daily average is 4°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 6°C shift in average temperatures.

Aso is a very wet location, receiving approximately 2083mm of precipitation annually, which averages out to around 174mm per month. The wettest month is June, averaging 394mm of rainfall. July and August also tend to see above-average precipitation. The driest month is December, with just 65mm. That's 329mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and December, totalling around 11cm annually. January is the snowiest month with approximately 6cm.

Aso is relatively calm, with an average annual wind speed of 12km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently spring in Aso, which began on March 20, 2026. Aso is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 30°C, while the coldest stretch bottoms out in January near 0°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Aso is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 95mm per month. By contrast, August can be uncomfortably hot with highs reaching 30°C, while January is the coldest period with lows dropping to 0°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Aso based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.