Met Éireann has issued two Status Yellow Thunderstorm Warnings.
Thundery outbreaks of rain and possible lightning is forecast for 26 counties tonight and tomorrow morning.
Localised flooding is likely for all of Munster, as well as Galway, Mayo, Roscommon and Sligo.
That's in place from 9pm tonight until 2am Sunday.
From 1am on Sunday then, the warning will be extended to Leinster, Cavan, Donegal, Monaghan and Leitrim until 5am.
Wind warnings are also due to come into effect on Sunday for Galway, Clare, Kerry and Cork.
In terms of weather for Halloween, we've got the latest forecast.
It'll be a windy day across Munster and Leinster with strong and gusty westerly winds, and gales along southern and western coasts.
There'll be showers or longer spells of rain, heavy at times and with the risk of isolated thunderstorms later in the evening.
So be careful out there Trick or Treating!!
Also, don't forget the clocks go back tonight so even if the weather is rough, we do get an extra hour in bed!
