An immediate status yellow thunderstorm warning has been put in place by Met Eireann for nine counties as heavy rain showers will fall nationwide.
Monday was officially the second-hottest day we've ever had in Ireland, with temperature scales topping 33C in the Phoenix Park weather station - just .3 of a degree off the 33.3C recorded back in 1887 in Kilkenny Castle.
However, the mini-heatwave is set to break up on Tuesday, and the air will cool considerably thanks to rain showers, thunder and lightning, with some southern counties already seeing the clouds gather.
