YOU SAID:

The weather has been changing from cloudy to sunny over the last few days

INTO JAPANESE

過去数日間、天候は曇りから晴れに変化しています

BACK INTO ENGLISH

Over the past few days, the weather has changed from cloudy to sunny

INTO JAPANESE

過去数日間、天気は曇りから晴れに変わりました

BACK INTO ENGLISH

Over the past few days, the weather has changed from cloudy to sunny