expression
clear then rain
A set phrase used in weather forecasts to indicate that the weather will be clear first and then turn to rain later in the day.
See also: 晴れ後曇り (はれのちくもり)
明日の天気は晴れ後雨でしょう。
Tomorrow's weather will be clear then rain.
天気予報では、午後は晴れ後雨となっています。
The weather forecast says it will be clear then rain in the afternoon.
Means 'clear then cloudy', following the same pattern as 晴れ後雨 but with a different second weather condition.
Compound of 晴れ (clear weather), 後 (after), and 雨 (rain), literally 'clear, later rain'.