The weather in Tokyo can be a little unpredictable in June. Spring still wasn’t that long ago, and sometimes we’ll get a day with a cool breeze or nighttime temperatures low enough that you’ll want a windbreaker, or at least a long-sleeved shirt.
On the other hand, midsummer is just around the corner, and steamy, sweltering days with high humidity and temperatures aren’t at all unusual. On just about any day the cloud layer has the potential to turn into a squall, too.
One thing Tokyo usually doesn’t see at this time of the year, though, is hailstorms.