Weather conditions

Weather conditions and variations in weather rarely endanger residents in Finland. However, extreme weather patterns such as heavy rainfall and storms are expected to increase as climate change proceeds, with a consequent increase in damage caused by extreme weather. Everybody should know how to prepare themselves for daylong power outages, floods and other breakdowns.


Floods are assessed to be the biggest natural disaster threatening resident wellbeing and the built environmental in the Helsinki area.

Flooding can take place when the seawater rises, rivers overflow and in case of sudden heavy rainfall. Floods created by heavy rainfall and thunderstorms can quickly result in extreme damage.
Read more: Climate-Proof City (ILKKA) – Tools for Planning


The most common damage caused by storms includes fallen trees, torn roofs and water damage caused by heavy rainfall and broken pipes. The Rescue Department assists in clearing damage caused by storms.

When a storm is impending, listen to weather reports and follow the instructions given by the authorities. If you are outdoors, make sure that you are not in the way of falling trees. Keep a distance of at least 20 metres from damaged wires.

As possible, move indoors, close doors and windows, and move away from windows. Unplug electrical appliances. Avoid using elevators in case of sudden power outages.

Finnish Meteorological Institute

The minimum supplies to keep at home for extended power outages:

  • A flashlight and batteries, candles and matches
  • A battery-operated radio to receive information
  • Drinking water, food and other necessities such as medicines and sanitary supplies
  • Cash. ATM machines do not work and card payments are not possible during a power outage.
  • Also keep water aside for the toilet. The toilet can be flushed only once during a power outage. Tap water may not be available during a power outage.