also: よわあめ
noun
light rain; weak rain
Refers to rain of low intensity, often used in weather forecasts. The reading じゃくう is standard; よわあめ is rare.
明日は弱雨が降るでしょう。
There will be light rain tomorrow.
弱雨のため、試合は中止にならなかった。
The game was not canceled because of the light rain.
Compound of 弱 (weak) and 雨 (rain). The reading じゃくう uses the on'yomi of both characters, while よわあめ uses the kun'yomi.