Noun
てんき
今日は天気がわるいです。
The weather is bad today.
天気よほうをかくにんしましょう。
Let's check the weather forecast.
天気と気候の違いは何ですか？
What’s the difference between weather and climate?
What is the heaven energy? If you think about it, that's all the stuff that falls on us from the sky. Lightning, rain, snow, hail... What is all of that? It's the weather.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.