The Philippines has cancelled in-person public school classes for the next two days and said the power grid on its main island could be strained as the country grapples with a heatwave that is also affecting other parts of Southeast Asia.

The state weather agency on Monday forecast temperatures in the capital region could reach 37 degrees Celsius (98.6 degrees Fahrenheit) in the next three days.

The agency said the heat index — the actual temperature felt by the body to include relative humidity — is expected to remain at a record 45 degrees Celsius (113° Fahrenheit), in the range which it classes as ‘dangerous’ as conditions can trigger heat stroke from prolonged exposure.