Cloud loomed over much of the country on Saturday accompanied by a relatively humid start to the day which is set to continue into this week.
Temperatures are forecast to peak at 31C on the coast and 34C further inland, with very little breeze.
The country's National Centre for Meterology said similar conditions are expected to continue into Sunday and Monday.
There is a possibility of fog in the early mornings, and the seas are forecast to be rough in the coming days, it added.
Watch: How to drive safely in the fog