晴はれ一いち時じ小こ雨さめ

• 晴はれ

  晴れ simply means 'clear weather', while 晴一時小雨 specifies a temporary light rain during an otherwise clear period.

• 小こ雨さめ

  小雨 means 'light rain' in general, whereas 晴一時小雨 is a specific forecast phrase combining clear weather and brief light rain.

Compound of 晴 (clear weather), 一時 (temporary), and 小雨 (light rain), forming a set phrase used in weather forecasts.