The San Juan National Weather Service (SNM) reports that a tropical wave will begin to leave heavy rain over the Puerto Rican area starting tonight.

According to the agency, the rain is expected to continue until Monday morning, however, dust from the Sahara Desert will arrive later in the afternoon.

“Tropical Wave will bring showers and thunderstorms Sunday night through early Monday morning, with the greatest impact on E-PR and USVI. Desert dust and drier air masses will result in mild weather conditions and foggy skies on Monday.”

Heavy rains will be concentrated in the east of the island and thunderstorms can be recorded in the west.

The Met Office warned that the temperature index could reach 100 degrees.