high season
US /ˈhaɪ ˌsiː.zən/
UK /ˈhaɪ ˌsiː.zən/

1.
alta temporada
the time of year when a particular holiday or tourist destination is most popular and prices are highest
:
•
Traveling during the high season can be very expensive.
Viajar durante a alta temporada pode ser muito caro.
•
The hotel is fully booked for the entire high season.
O hotel está totalmente reservado para toda a alta temporada.