Helsinki
Finland
Long-term weather forecast
Long-term weather forecast
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May weather forecast and Climate
Helsinki, Finland

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A scenic reflection in the water of the illuminated city of Helsinki in Finland, viewed from the water
A scenic reflection in the water of the illuminated city of Helsinki in Finland, viewed from the water
  • The average high temperature in May: 14.4°C

The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is February (-1.9°C).

  • The average low temperature in May: 6.3°C

The month with the highest average low temperature is July (14.2°C).
The coldest month (with the lowest average low temperature) is February (-7.4°C).

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  • The average rainfall in May: 37mm

The wettest month (with the highest rainfall) is August (80mm).
The driest month (with the lowest rainfall) is April (32mm).

  • The average rainfall days in May: 11 days

The month with the highest number of rainy days is December (20 days).
Months with the lowest number of rainy days are April and May (11 days).

  • The average snowfall in May: 0mm

The month with the highest snowfall is February (230mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

  • The average sea temperature in May: 5°C

The best month for swimming (with the highest average sea temperature) is August (16°C).
Coldest months (with the lowest average sea temperature) are February and March (1°C).

  • The average daylight in May: 17h

The month with the longest days is June (Average daylight: 19h).
The month with shortest days is December (Average daylight: 6h).

  • The average sunshine in May: 9.2h

The month with most sunshine is June (Average sunshine: 9.9h).
The month with least sunshine is December (Average sunshine: 0.9h).

  • The average UV index in May: 4

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 0).

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