Egypt's Meteorological Authority (EMA) warned of a three-day wave of unstable weather starting Sunday.
The EMA said the country's northern coasts and Nile Delta governorates will witness medium to heavy rainfall, which will peak on Monday in the Canal cities and Gulf of Suez. Floods will be seen in some areas in Sinai.
Rainfall will continue through Tuesday, with Lower Egypt seeing fewer rainfall.
Rain will be accompanied by a drop in temperatures of 4-5 degrees Celsius, according to the EMA statement.
Active winds are set to affect maritime navigation along the Red Sea.
Greater Cairo is forecast to be hit by mild to heavy rainfall from Sunday to Tuesday.
Highs are expected to stand at an average of 15-16 degrees Celsius in Cairo with Nile Delta seeing highs of 14-15 degrees, and lows dropping to 9-11 and 9-10 degrees, respectively.
The coastal city of Alexandria will see almost the same highs as Cairo and temperatures will drop to 9-10 degrees at night.
South Sinai is expected to see highs of 21-22 degrees Celsius, and lows of 11-12 degrees.
Southern and Northern Upper Egypt will see highs of 20-21 degrees and 16-17 degrees, respectively, with lows of 10-11 degrees and 8-9 degrees.