Today is forecast to be the hottest day of the year so far - and tomorrow it's going to be even hotter!
Temperatures are expected to break 30 degrees Celsius for the first time this year.
It's all to do with sticky, humid air drifting in from the Mediterranean.
Health officials have issued a heatwave alert for large parts of the country.
They say you should take precautions to keep as cool as possible.
But those planning beach breaks this weekend may be wise to pack umbrellas too, with the prospect of thunder and heavy showers overnight into Saturday.
Weather forecasters have issued a severe weather warning for much of the country on Saturday, with the potential for flooding.