What's the weather like?

The weather's nice.

The sun is shining.

The weather is bad.

It's raining.

I need an umbrella.

I'm freezing.

It's snowing.

wind

It's windy.

I'm cold.

I'm hot.

It's going to be 30 degrees Celsius tomorrow.

It's minus five degrees Celsius today.

Put something warm on. (informal)