Climate Overview
The climate in Kumejima is warm and mild. The average annual temperature is 24°C and approximately 2331mm of precipitation falls per year. Kumejima receives a notable amount of rainfall throughout the year, including during its driest month. Kumejima 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 February, January, March, when temperatures can drop to 17°C.
Temperature
Kumejima sees moderate temperature variation throughout the year, ranging from 17°C to 29°C. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 29°C. February is the coolest month, with minimum temperatures around 17°C and an average of 18°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between November and December, with a 3°C shift in average temperatures.
Precipitation
Kumejima is a very wet location, receiving approximately 2331mm of precipitation annually, which averages out to around 194mm per month. The wettest month is June, averaging 340mm of rainfall. May and August also tend to see above-average precipitation. The driest month is November, with just 120mm. That's 219mm less than June, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
Kumejima is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.
Seasons
89 days until Autumn
It is currently summer in Kumejima, which began on June 21, 2026. Kumejima 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 29°C, while the coldest stretch bottoms out in February near 17°C. Autumn is next, beginning on September 23, 2026 — 89 days from now.
Spring
Temperatures range from 19 to 25°C. Rainfall is heavy, totalling around 604mm across the season with a monthly average of 201mm. Winds are generally light, averaging 7km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 27 to 29°C. Rainfall is heavy, totalling around 774mm across the season with a monthly average of 258mm. Winds are generally light, averaging 6km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 28°C. Rainfall is heavy, totalling around 498mm across the season with a monthly average of 166mm. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 17 to 21°C. Rainfall is heavy, totalling around 455mm across the season with a monthly average of 152mm. Winds are generally light, averaging 8km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Kumejima 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. 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.
