The ordinary word for day-to-day weather conditions, often used with 良い, 悪い, 予報, or verbs such as 確認する.
I checked tomorrow's weather.
The weather is bad today.
In positive contexts, especially いい天気 or お天気, it refers to pleasant, fair weather rather than weather in general.
It's lovely weather today.
Since the weather is so nice, let's take a short walk.
The weather is nice today, isn't it?
I checked the weather forecast before going out.
The weather in the mountains can change suddenly.
It turned into nice weather from the afternoon.
We were blessed with good weather on the day of the sports festival.
weather map
moody person; temperamental person; fickle person