According to the National Centre for Hydro-meteorological Forecasting, the hot weather will appear in the northern and central regions from Saturday.
The northern and central regions to experience a hot spell with temperatures of more than 38 degrees centigrade.
Some mountainous localities in the central and north-west regions would see the temperature of more than 38 degrees centigrade.
The hot spell is set to last three days.
Earlier, the National Centre for Hydro-meteorological Forecasting said that the average temperature for the whole country in May this year would 0.5 - 1-degrees centigrade higher than the same period last year.
The northern region recently witnessed a severe hot spell, with midday outside temperatures of around 45 degrees centigrade.
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