And just like that, rainy season is over! There has been no official announcement yet, but the appearance today of cumulus clouds (積雲、sekiun) are a dead giveaway. The end of rainy season does in no way mean the end of rain, of course; in many ways, summer rain is more difficult to predict. Sudden heavy thundershowers particularly in the evening are common.
An interesting Japanese term which has somewhat entered English is “guerrilla rainstorm”, which you can read about at the link. In particular, heat islands centered on urban areas can lead to updrafts which then draw in abundant surrounding moisture to produce very localized sudden downpours. So don’t put away your umbrellas just yet.
(By the way, Typhoon One was just spawned near the equator. Its path is not yet clear, but keep an eye on it towards the weekend.) - William