Usage patterns
天気がいい/悪いthe weather is good/bad
The weather is nice today, isn't it?
天気予報を確認するto check the weather forecast
I checked the weather forecast before going out.
天気が変わるthe weather changes
The weather in the mountains can change suddenly.
〈天気〉になるthe weather turns fine
It turned into nice weather from the afternoon.
天気に恵まれるto be blessed with good weather
We were blessed with good weather on the day of the sports festival.