Landslide warnings have been issued to eight districts.
The National Building Research Organisation said landslide warnings issued to the Colombo, Kalutara, Kandy, Matale, Nuwara Eliya, Galle, Kegalle, and Ratnapura districts will be in place till 3pm.
Meanwhile, the NBRO requests persons residing in landslide prone areas to remain vigilant.
The Irrigation Department warns of possible flooding in low-lying areas along the banks of the Kalu, Gin and Nilwala Rivers due to the inclement weather experienced over the island.
The Department said the water levels of rivers can increase at short notice owing to heavy rains.