A Status Yellow high temperature warning is set in place for the entire country as it is expected to hit 28C today.
Met Éireann said in its alert that Thursday is set to be very warm and humid, as well as Friday, with daytime temperatures to exceed 27C.
The coolest parts of the country are expected to be coastal areas and nighttime temperatures will not go below 15C.
They have also warned that due to the high temperatures, it can lead to heat stress and uncomfortable sleeping conditions, with a higher risk of water-related incidents.
The warning is currently in place and will remain until 8am on Saturday.
Met Éireann said: “Today will be very warm with highs of 24 to 28 degrees. Dry in most areas this morning with hazy sunny spells. However, showers may develop in the southeast and spread northwards over Leinster, with a chance of thunderstorms and spot flooding possible, especially in the east.
“Sunshine and isolated heavy or thundery showers this afternoon with light to moderate southeast breezes.”
They continued: “Friday will be another very warm or hot day with highs of 24 to 28 degrees, possibly higher in a few places. It will be mainly dry with sunny spells, aside from some coastal mist or fog in parts.
“Isolated thunderstorms may develop inland during the afternoon. Light variable or southerly breezes.”
The national forecaster has also warned that pollen levels are set to be high today and tomorrow while the UV index is moderate.
Uisce Éireann has also issued a warning for people to conserve water as the demand increases during warm weather, despite no hosepipe bans in place.