Slow winds are to prevail, with fog and frost expected in separate areas.
Minimum temperatures are to fall to -5...-10C, -11..-16C in southern Kurzeme and parts of Zemgale, plunging to -17..-19C in the Latgale cultural region.
Daytime temperatures of 0..-5C are expected on Thursday, with the weather slightly colder in Latgale at -8C.
Rīga will be somewhat cloudy with bouts of sunshine and a gentle wind. Minimum temperatures of -8..-9C at night and about -4C during the day are in the forecast.