And drought conditions are set to continue for the foreseeable future with soil levels remaining extremely dry, according to forecaster Liz Walsh.
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Even intermittent showers expected throughout the week will not be enough to bring the moisture levels back to normal, she added.
"Arising from the effects of prolonged high pressure weather systems, high temperatures and drought conditions, an extreme fire risk is deemed to exist in all areas where there are hazardous fuels," it reads.
The warning comes after fire officers – with the help of the Air Corps and Coillte staff – were able to get a massive forest fire under control yesterday at the Slieve Bloom mountains in the midlands.
"There are hot spots and we are working with the Air Corps and fire service to attack these hot spots," he told the Irish Independent.
The fire ignited on Wednesday on the Offaly side of the mountain range.
The Offaly and Laois Fire Service has been fighting the blaze since then, aided by two Air Corps fire-fighting helicopters.
Meanwhile, a status yellow weather advisory remains in effect until midnight on Wednesday.
The warning from Met Éireann advises that the "mostly dry and warm weather will continue across Ireland for the rest of this week and through next week as well, thus exacerbating drought conditions."