Soft Day

 "A soft day” is a phrase you will hear frequently in Ireland. In the west of the country it is usually followed with a gracious salutation, of “thank God.” These soft days occur regularly where Atlantic mists envelope the mountains along Ireland’s rocky coastline.

A soft day is a description of the weather, and is probably very unique to the Emerald Isle. It is a day when the precipitation is a cross between mist and drizzle and is sometimes referred to as “mizzle”. The rain does not fall to the ground in heavy droplets, but seems to hover and linger in the air."

source https://www.irishamericanmom.com/a-soft-day-thank-god/