The Yokosuka area climate is divided into six distinctive seasons. The two rainy seasons, which occur in late spring and early fall, are more comparable to the wet climate of Seattle, Washington. Winter, the period from December through mid-March, is characterized by fair skies, cool to cold temperatures and low relative humidity levels. Hot, humid, tropical air dominates the Yokosuka area. This season can easily be compared with the summer weather of the mid-Atlantic states.
Temperatures finally begin to cool as wet, windy weather once again returns.
The pleasant days of fall begin in mid-October and last until the end of November. Precipitation decreases as cool dry air from China becomes dominant over Japan. An average of three tropical cyclones pass within 200 miles of Yokosuka each year. Tropical cyclones are normally in their dissipation stage as they pass Yokosuka, but heavy rain and strong winds will still accompany these weakening storms. It is always best to take precautionary measures to avoid possible damage from these storms, even though it may seem that they will pass by.