It's raining.
Está lloviendo.
Lluvioso.
thermometer
el termómetro
It's cold.
Hace frío.
It's drizzling.
Llovizna.
It's misty.
Hay neblina.
It's cloudy.
Está nublado.
forecast
el pronóstico
It's very sunny.
Hace mucho sol.
Esta muy soleado.
It's snowing.
Nieva.
Esta nevando.
It's sprinkling. This can also mean its drizzling.
Hay lloviznas.
It's snowing.
Está nevando.
It's hot.
Hace calor.
It's windy.
Hace viento.
It's thundering.
Truena.
It's pouring.
Hay lluvias torrenciales.
It's sunny.
Está soleado.
Hace sol.
It's cool.
Hace fresco.
It's bad weather.
Hace mal tiempo.
It's foggy.
Hay niebla.
It's hailing.
Hay granzio.
What's the weather like?
¿Qué tiempo hace?
It's good weather.
Hace buen tiempo.
It's rains. This expression can also mean it is raining.
LLueve.
It's humid.
Hay humedad.
There's lightening.
Hay relámpagos.