Torrential rains that caused widespread flooding and landslides across Kenya in recent weeks, killing at least 210 people, are forecast to worsen over the rest of this month, President William Ruto said on Friday.

The floods have wreaked havoc, destroying homes, roads, bridges and other infrastructure across Kenya, East Africa's largest economy. The death toll exceeds that from floods triggered by the El Nino weather phenomenon late last year.

"Sadly, we have not seen the last of this perilous period, as the situation is expected to escalate. Meteorological reports paint a dire picture," Ruto said on Kenyan television. "Kenya may face its first-ever cyclone."

Cyclone Hidaya is expected to make landfall in Tanzania, Kenya's southern neighbour, on Saturday, bringing with it waves almost eight metres high and 165 kph winds, the IGAD Climate Prediction and Applications Centre said.

Floods have killed more than 160 people in Tanzania since the beginning of April, Tanzania's government spokesman Mobhare Matinyi said.

"This cyclone, named Hidaya, that could hit anytime now, is predicted to cause torrential rain, strong winds and powerful and dangerous waves," Ruto said.

Earlier this week, Ruto ordered those living in landslide-prone areas to leave for safer ground.

The government has asked people living near 178 dams and water reservoirs, now close to overflowing, as well as those in informal settlements close to rivers and streams, to evacuate.

Ruto said the reopening of all schools for the upcoming term, which was meant to start this week, would be postponed until further notice. (Reuters)