Temperatures in the Shannonside region could reach almost 30 degrees today.
A status yellow high temperature warning came into affect at midday for Roscommon and Leitrim.
That will be extended to all parts of the country tomorrow, while the Department of Agriculture has issued a red warning for extreme risk of gorse and forest fires until next Monday.
Meanwhile, people have been advised not to walk their dog during the hot spell apart from early in the morning and when it's cooler in the evening.
Animal rights activist Hazel Robinson, from Hungry Horse Outside in Longford, is advising people to keep an eye on their animals in the warm weather:
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