The forecast for the week can be summarized in one word: unstable. “There’s hardly a day when it wouldn’t rain somewhere,” said Markus Mäntykannas, a meteorologist at Foreca weather service.

On Monday, scattered rain showers—even thunder—are likely in most parts of the country.

A low-pressure front will arrive on Tuesday and increase rain chances everywhere. Daytime highs are around 10 degrees Celsius.

Scattered showers are likely mid-week with daytime highs around 15 degrees and lows dropping to 10.

By the end of the week, nighttime temperatures are becoming cold; frost in the south, freezing temperatures in the north.