expression
sunny then cloudy; clear then cloudy
Fixed weather-forecast phrase meaning that the weather will be fine at first and later become cloudy. Used in spoken and written forecasts.
See also: 晴後雨 (はれのちあめ)
明日の天気は晴れ後曇りでしょう。
Tomorrow's weather will be sunny, then cloudy.
天気予報では、午後は晴れ後曇りとなっています。
The weather forecast says it will be sunny, then cloudy in the afternoon.
Means 'sunny then rainy'; the same pattern with 雨 instead of 曇り.
Compound of 晴れ (fine weather), 後 (after), and 曇り (cloudy weather), following the pattern of weather-forecast phrases.