Increased high cloud on Thursday are expected to lead to isolated showers and thunderstorms in the mountains, inland and northern coasts.
Temperatures will be 31 C inland, 29 C on the southern coast, 27 C on remaining coasts and 20 C in the mountains.
Dust levels are above average and the Labour Ministry is urging vulnerable groups to be careful.
On Friday, Saturday and Sunday the weather will be mainly fine in the morning, with increased clouds at intervals. In the afternoon clouds may lead to isolated showers and or storms, mainly in the mountains, inland and the eastern shores.
Temperatures will remain unchanged on Friday at slightly above average for the time of year. They will drop gradually over the weekend to average for the time of year.