will rain
It will definitely rain this afternoon.
It’s sure to rain.
Aunque tratemos de posponerlo, se supone que lloverá toda la semana.
Even if we try to postpone it, it is supposed to rain all week.
— El tiempo contigo (2019)
I suppose it will rain soon.
Mañana lloverá en el sur de Inglaterra.
It will rain tomorrow in southern England.
Me pregunto si lloverá mañana.
I wonder if it will rain tomorrow.
It will probably rain tomorrow.