Hay fever sufferers in the north and east of the country will suffer more misery with a high pollen count in Ulster and Leinster.
Yesterday, both Leinster and Ulster had high pollen counts due to the warm sunny weather.
Counts will be moderate in Munster and in Connacht.
Met Eireann said: "The pollen risk will be high for grass pollen in eastern and south-eastern areas and more moderate due to showers in the West.
"Weed pollen will also be airborne with a significant risk to some sufferers."
Heading into tomorrow, the pollen count for Leinster will remain high while it will be moderate in Munster and Ulster and low in Connacht.
And with further warm weather on the way this weekend, hay fever sufferers will be on alert.
A forecaster added: "Most grasses are now in flower and emitting plenty of pollen on warm, dry days. The risk will be high to very high when temperatures are in the high teens or above.
"Nettle, dock and plantain will be airborne in significant amounts, with a high risk on warm, dry sunny days."
