Residents woke up to overcast and muggy conditions on Monday with temperatures expected to peak at 49°C again.
"Hot to very hot" weather is expected to continue throughout the week, according to the National Centre for Meteorology and Seismology.
Skies will be partly cloudy and conditions hazy at times with a slight possibility of rain, particularly over the eastern and southern areas of the country by the afternoon.
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Temperatures across the country range between 31°C and 46°C along the coast, 27°C to 49°C inland and 25°C to 39°C in the mountains.
Winds blowing between 15 to 28 kph will pick up dust and sand, causing haze over exposed areas of the country, such as motorways.
Sea conditions are expected to be "slight to moderate" in the Arabian Gulf and moderate, becoming rough at times in the Sea of Oman.
Humidity will reach highs of 90 per cent along coastal areas and 80 per cent inland, rising overnight and into Tuesday morning.
The lowest temperature recorded over the country on Monday morning was 25.6°C in Jais mountain.
