Climate Overview
The climate in Yokosuka is temperate. The average annual temperature is 17°C and approximately 1821mm of precipitation falls per year. Yokosuka receives a notable amount of rainfall throughout the year, including during its driest month. Yokosuka is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, September, July. The coldest months are February, January, March, when temperatures can drop to 7°C.
Temperature
Yokosuka sees moderate temperature variation throughout the year, ranging from 7°C to 27°C. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 27°C. February is the coolest month, with minimum temperatures around 7°C and an average of 9°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between September and October, with a 4°C shift in average temperatures.
Precipitation
Yokosuka is a fairly wet location, receiving approximately 1821mm of precipitation annually, which averages out to around 152mm per month. The wettest month is October, averaging 273mm of rainfall. June and September also tend to see above-average precipitation. The driest month is December, with just 74mm. That's 199mm 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
Yokosuka is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, 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
4 days until Summer
It is currently spring in Yokosuka, which began on March 20, 2026. Yokosuka 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 27°C, while the coldest stretch bottoms out in February near 7°C. Summer is next, beginning on June 21, 2026 — 4 days from now.
Spring
Temperatures range from 9 to 20°C. Rainfall is heavy, totalling around 440mm across the season with a monthly average of 147mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 20 to 27°C. Rainfall is heavy, totalling around 512mm across the season with a monthly average of 171mm. 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 625mm across the season with a monthly average of 208mm. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 7 to 13°C. Precipitation is moderate at around 244mm for the season, averaging 81mm per month. Winds are generally light, averaging 6km/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 Yokosuka 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.
