It's going to be a chilly day, so be prepared.
If you're stepping outside this morning, be prepared - because it's freezing and very frosty. An orange temperature warning will remain in place until 10am.
The big freeze has hit Dublin, with temperatures hitting a low of -6C last night across the county.
And it won't get much warmer throughout the day, so keep the hat, scarf and gloves close.
By tonight temperatures will drop into the minus again, hitting a low of around -3C.
A Met Eireann forecaster says: "Severe frost this morning. Then a cold, bright day that will stay mainly dry. Highest temperatures of 3C or 4C in cold northerly winds.
"Mostly dry and clear overnight with a widespread severe frost and temperatures falling to between -1c and -3C. Winds turning more northwesterly in direction."
Tuesday will slowly see temperatures increase, and it will be a clear and frosty start and rain on the way by the evening. Temperatures will max out at 8C.
Read also more Irirsh news here.