It's valid from midday.
Met Éireann has issued a status yellow weather warning for thunderstorms for most of the midlands.
It says localised, slow-moving showers will bring heavy downpours, possible thunder, and a chance of hail.
Localised flooding and difficult travelling conditions are also likely.
The entire eastern half of the country is affected, along with Sligo, and Donegal, and most of the north.
It's valid from midday today, and will be in place until 10pm tonight.
Alan O'Reilly from Carlow Weather says temperature could jump to 26 or 27 degrees:
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