Tropical storm Beatriz continued to hit parts of Mexico on June 2.
Heavy rains are moving inland, and the storm has weakened.
Local authorities reported three people dead and two minors missing.
Schools are closed for states affected by the storm.
The U.S. National Hurricane Center said the storm had maximum sustained winds of 25 mph (35 kph) early Friday and was headed north-northeast at about 7 mph (11 kph).
It was centered about 105 miles (170 kilometers) north-northeast of Puerto Angel and was expected to continue to weaken over Oaxaca State.
Beatriz is expected to dump 2 to 5 inches across Oaxaca. This may result in life-threatening flash floods and mudslides.
Some areas could receive 18 inches of rain from the storm.