Met Eireann is warning of localised flooding, hail damage, and possible power outages.
The Midlands counties have been added to the list of those under a yellow warning for severe thunderstorms today.
The alert comes into effect from 9am for Laois, Offaly, Westmeath, Kildare, Longford, Meath, Tipperary, Cavan, and Clare.
That continues until 6 this evening, with a risk of localised flooding, hail damage and difficult travelling conditions along with potential outages to power and water supplies.
The warning from Donegal and all of Connacht remains in place until 9 am.
Meanwhile the yellow high temperature warning for the entire country has been extended to tomorrow morning.
Offaly's Cathal Nolan from Ireland's Weather Channel says it will be next week before temperatures to return to more normal levels:
Alan O'Reilly from Carlow Weather says there were very intense thunderstorms in the northwest last night:
With high temperatures set to remain in place into the weekend, the Irish Coast Guard is urging the public to stay safe if planning an activity on or near the water.
Sea and inland water temperatures remain low despite the warmer air temperatures.
This contrast can present a hidden but serious risk of cold-water shock and hypothermia to anyone entering or unexpectedly falling into the water.
Remember to enter the water slowly to acclimatise and to stay within your depth.
If you are travelling to the coast during this warm spell, familiarise yourself with water safety advice.
If you are planning an activity in or on the water, remember: Swim at a lifeguarded waterway if possible, between the red and yellow flags.
Swim where you can be seen within your depth and stay within your depth.
Avoid entering the water in locks, marinas and harbours where hidden hazards may be present.
Never use pool inflatables on sea, rivers or lakes Supervise children: never leave them unattended near water.
Avoid alcohol before swimming, operating watercraft or being near water, as it impairs judgment, coordination, and reaction time.
Be aware that cold water temperatures can also cause cold water shock, increasing the risk of drowning.
Pay attention to all water safety signs and warnings and carry a means of calling for help Check tides and updated weather warnings.
Always wear a correctly fitting serviced lifejacket or buoyancy aid when boating or participating in water sports.
Let others know where you are going and when you expect to return.
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