Wanderlust World Wanderlust World Like many other temperate maritime cities, Yokohama does, in fact, enjoy different weather during each of the four seasons. Summers are hot and humid, while autumns are cooler. The changing temperatures in early September bring jellyfish to the area to put a quick end to the swimming season. Winters are cool, even cold and while snow is not unusual--Yokohama averages six days of snowfall each year--there is generally little or no accumulation. Spring in Yokohama, like spring throughout Japan, is marked by the wait for the cherry blossom trees to bloom, which unofficially marks the return of warm weather. Both the vernal (spring) and autumnal equinoxes are national holidays.
Much of Japan experiences wet weather for six weeks at the start of every summer. In Yokohama, that period is generally between mid-June and mid-July, although the rain has been known to start earlier and end later. June usually brings an average of 7.4 inches of rain, while July has 6.6 inches.
Typhoon season (which peaks in September and October) can bring severe and violent storms to Japan, and the coastline and beaches of Yokohama are extremely vulnerable. While the strongest and most severe storms generally strike farther south, Yokohama has been known to experience plenty of powerful storms of its own. Unlike U.S. hurricanes, which are named, the Japanese typhoons are numbered.
Yokohama generally experiences its lowest temperatures in January and February, when the average lows hit 37 degrees Fahrenheit. The hottest weather is in August, where the highs average 84 degrees with high humidity (with the hottest days in the 90s and even approaching 100 degrees).
Yokohama averages 2,063.6 hours of sunshine every year, according to the Yokohama Convention and Visitors Bureau. The city also gets an average of 1,630.5mm of rainfall annually--or nearly 65 inches. That's more than the average rainfall of any U.S. state. Florida, for example, gets 54 inches annually.