An unusual November heatwave is sweeping across Finland this week. The Finnish Meteorological Institute reports temperatures will rise significantly above seasonal norms nationwide.
Southern Finland will experience daytime temperatures around 10°C, with occasional nighttime warmth matching these levels. This represents exceptional warmth for late autumn in the Nordic region.
Meteorologist Henri Nyman said in a weather bulletin that central Finland will see similar temperatures, particularly on Wednesday. Northern Finland will experience temperatures hovering around 5°C, with occasional frost expected in the northwestern arm region.
A deep Atlantic low-pressure system brings moisture and rainfall across the country. The first extensive rain area will reach western Finland during Tuesday evening rush hour.
This precipitation will spread nationwide through Wednesday morning. Some areas in Northern Lapland will see partial snowfall instead of rain.
Wednesday brings water and drizzle showers to southern and central regions. Fog and mist will also appear periodically during the early week.
Drier and slightly cooler air flows into Finland after Wednesday. Thursday appears set to become the first widely sunny day across nearly the entire country in some time.
The weather divides across Finland for the weekend. Southern regions face another low-pressure system bringing moist air from the southwest. Northern Finland maintains slightly cooler and drier conditions, though some snow or sleet may occur.
Next week shows signs of clearer cooling, particularly in northern Finland. If forecasts hold, temperatures will drop significantly nationwide. This could bring the first widespread snowfall to southern regions.
This temperature rollercoaster demonstrates Finland's volatile autumn transition period, where winter can arrive within days of unseasonal warmth.