It will end at 10am tomorrow.
A fog warning has been issued for 11 counties, including Kildare.
The status yellow alert will come into effect at 5am for all of Leinster - with the exception of Carlow, Kilkenny and Wexford.
It's due to expire at 10am.
Road-users are warned to take extra, with pockets of dense fog expected.

Kfm Obituary Notices
New Cultural Programme Set For Castletown House
Celbridge Woman Who Lost Sister To CF Calls For People To Support Today's Fundraiser
Protestors, Including Kildare's John Dallon, Refused Entry From Government And Agriculture Bodies Meeting
Defence Forces Travelling To The Curragh Today For Training
Newbridge Silverware’s Silver-plated Cutlery Factory Officially Closes
Martin Heydon Will Meet Farming And Haulier Groups This Morning Amid Fuel Protests
Missing 17-Year-Old Joshua Treacy From Maynooth Has Been Located