What's the weather like today?
今天天气怎么样？
The weatherman predicts a fine day today.
天气预报员说今天是一个好天气。
How's the weather today?
今天天气怎么样？
What's it like outside today?
今天外面天气怎么样？
What sort of day is it?
今天是什么样的天气？