Update 2.30pm: Met Éireann has issued a nationwide warning for thunder.
The Status Orange alert applies to Connacht, Laois, Longford, Offaly, Westmeath, Meath, Cavan, Monaghan, Clare, Limerick and Tipperary.
Here's the rainfall forecast for the rest of today.
Note the very heavy, thundery showers through many central & western areas.June 8, 2018
People in those areas are being told to expect widespread thunderstorms between now and eleven tonight.
Forecasters also say large amounts of rain could also fall, leading to spot flooding.
Earlier: Heavy rainfall and spot flooding on the way as Met Éireann issue status yellow weather warning
Heavy rainfall and spot flooding is on the way for some parts of the country.
Met Éireann says a status yellow weather warning comes into effect from noon today until 9pm tonight.
It predicts heavy thundery downpours which will lead to high intensity rainfall with some localised spot flooding possible.
The Western half of the country and the Midlands are most at risk.
Warm today with hazy sunshine. Largely dry this morning but in the afternoon heavy, thundery showers will develop with spot flooding in parts of the midlands and west. The east and south will stay mainly dry though. Maximum temperatures 20 to 24 degrees in light breezes. pic.twitter.com/LGeSer5v5q— Met Éireann (@MetEireann) June 8, 2018
The pollen count for today is also high countrywide.