The weather (polite term); referring politely to atmospheric or meteorological conditions.
今日のお天気は晴れで、気温も高いです。
Today's weather is sunny and the temperature is high.
お天気予報によると、明日は雨が降るそうです。
According to the weather forecast, it will rain tomorrow.
お出かけの際はお天気に注意してください。
Please pay attention to the weather when going out.
Mood or temper (figurative use); e.g., saying someone's "weather" is good/bad to mean their mood.
今朝はお天気がいいから、彼も機嫌が良さそうだ。
Since he's in a good mood this morning, he seems cheerful.
最近お天気が不安定で、上司の機嫌も変わりやすい。
Lately moods have been unstable, and the boss's temper changes easily.