Motorists in the regions of Ostrobothnia, South Karelia and Kymenlaakso face the worst road conditions on Sunday, according to forecasters.
Driving conditions nationwide on Sunday range from 'poor' to 'very poor' as precipitation mainly falls down as snow and sleet. Areas along the western coast will see rain.
"Snow is reducing visibility and roads are slippery, so lower your speed," the eastern Uusimaa rescue department tweeted.
Big thaw vs deep freeze
On Sunday, the mercury in western and southern coastal areas is hovering around the freezing point after several weeks of sub-zero weather, including spells of double-digit icy temperatures.
Western parts can expect local rain and snow showers in the afternoon. Up north thermometers will remain in -20-degree Celsius territory. Northern areas will see partly cloudy, but mainly dry conditions, according to the Finnish Meteorological Institute (FMI).
Temperatures in eastern parts range from -5 to -15 degrees and -10 to -20 in the northwest as the weekend draws to a close.