Heat index, the temperature felt on human body is likely to increase up to ‘Caution level’ at some places in Northern, North-central, North-western, Western, Southern and Eastern provinces and in Rathnapura and Monaragala districts.

“The Heat Index Forecast is calculated by using relative humidity and maximum temperature and this is the condition that is felt on your body”, said the Met Department in a statement.

The Department noted that prolonged exposure to the sun and outdoor activity will result in fatigue while continuing activity could lead to heat cramps.

Therefore, residents have been requested to stay hydrated and to limit strenuous outdoor activities.