The coastal state is battered by the annual monsoon every year but the rains have been particularly severe this season.
The toll from the record rainfall has continued to rise, as rescue workers dig through the debris and find the remains of dozens of people reported missing.
Thais reacted with relief, gratitude and exhilaration after the last group of the "Wild Boars" soccer team was rescued from the Tham Luang cave.
The "Wild Boars" team has been confined in a cramped chamber several kilometres inside the Tham Luang cave complex since June 23.
The young football team, aged between 11 and 16, have been stuck in the Tham Luang cave in northern Thailand since Saturday night after monsoon rains blocked the main entrance.
Oman News Agency reported that the cyclone will intensify within 12 hours.
Flooding and strong winds caused by a tropical cyclone left at least 18 people dead and thousands homeless across two countries in the Horn of Africa, an aid agency said on Monday.