couvert
All of a sudden the sky became overcast.
Tout à coup, le ciel s'est couvert.
It was overcast yesterday.
Le ciel était couvert hier.
It will be cold and the sky will be overcast.
Il fera froid et le ciel sera couvert.
The sky has become overcast.
Le ciel s’est couvert.
The sky suddenly became overcast.
Le ciel s'est soudainement couvert.
It's overcast today.
Le ciel est couvert aujourd’hui.