It's windy.
Hace viento.
It's cold.
Hace frío.
It's stormy.
Hay tormenta.
It's cloudy.
Hace nublado.
It's raining.
Está lloviendo.
There's thunder and lightning.
Hay tormenta con truenos y relámpagos.
It's hot.
Hace calor.
It's sunny.
Hace sol.
It's snowing. / It's snowy.
Está nevando.