Climate Overview
The climate in Minamibōsō is temperate. The average annual temperature is 17°C and approximately 1881mm of precipitation falls per year. Minamibōsō receives a notable amount of rainfall throughout the year, including during its driest month. Minamibōsō 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, February, December, when temperatures can drop to 6°C.
Temperature
Temperatures in Minamibōsō vary considerably across the year, with a 23°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 6°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.
Precipitation
Minamibōsō is a fairly wet location, receiving approximately 1881mm of precipitation annually, which averages out to around 157mm per month. The wettest month is October, averaging 254mm of rainfall. June and September also tend to see above-average precipitation. The driest month is February, with just 86mm. That's 167mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
Minamibōsō is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
92 days until Autumn
It is currently summer in Minamibōsō, which began on June 21, 2026. Minamibōsō 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 January near 6°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.
Spring
Temperatures range from 9 to 21°C. Rainfall is heavy, totalling around 439mm across the season with a monthly average of 146mm. Winds are generally light, averaging 5km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 20 to 29°C. Rainfall is heavy, totalling around 521mm across the season with a monthly average of 174mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 13 to 26°C. Rainfall is heavy, totalling around 647mm across the season with a monthly average of 216mm. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 6 to 13°C. Precipitation is moderate at around 274mm for the season, averaging 91mm per month. Winds are generally light, averaging 5km/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 Minamibōsō 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.
