A slightly cloudy sky; thin cloud cover where the sun may still be visible.
今日の午前中は薄曇りで、午後は晴れる予報だ。
This morning is slightly cloudy; it's forecast to clear up in the afternoon.
薄曇りの光は写真に柔らかい雰囲気を与える。
The light on a slightly cloudy day gives photos a soft atmosphere.
遠足には薄曇りくらいの天気がちょうどいい。
Slightly cloudy weather is just right for an outing.