Extreme heat scorching the Philippines has left farmers unsettled as the above average temperatures put their crops and livelihoods at risk.

Piling Payuyao, 64, a farmer in Candaba, north of Manila, told Reuters on Tuesday (April 30) the rising temperature has significantly affected his output.

"When the heat is very extreme we can't produce good quality fruits and vegetables. That is the effect of the heat. Farmers have to suffer a loss from low prices because of the poor quality," said Puyayo.

Forecasters said temperatures in the capital region could soar to 37 degrees Celsius (98.6 degrees Fahrenheit) in the next two days according to the country's weather agency.

Hilario Pamintuan, a farmer who grows fruits and vegetables, says his produce will not grow as big as his previous harvests due to the excessive heat. He is expecting to make a huge loss from his investment after resorting to selling his crops at a lower price.

The country's weather 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 degrees Fahrenheit), in the range which it classes as "dangerous" as conditions can trigger heat stroke from prolonged exposure.

(Production: Adrian Portugal)