Temperatures are expected to rise slightly on Friday and again Saturday, making the weekend unusually hot for the season.
There may be light rainfall, particularly in the east. On Friday night there may be fog along the coast.
Airports were temporarily closed to incoming flights on Friday morning due to heavy fog along the coast. Five flights were redirected to Cyprus.
The Weather Service has issued a fire warning. The weather conditions are likely to make any fires particularly quick-spreading in the Galilee region, the north and the northern Negev.
Temperatures are expected to drop slightly on Sunday and Monday, but will remain unseasonably high.