Residents across the country woke up to partly cloudy skies, with light to moderate winds reaching up to 36kph inland.
Temperatures will hit a maximum of 39°C in interior areas and 36°C along the coast, said the National Centre of Meteorology and Seismology (NCMS).
Humidity levels are expected to reach 85 per cent along the coast and 80 per cent in the interior.
Light to moderate winds will freshen conditions during the day, with south-easterly winds blowing between 14 and 26kph across the interior.
The Arabian Gulf and Oman Sea will be moderate to rough.