May weather forecast
Helsinki, Finland

A scenic reflection in the water of the illuminated city of Helsinki in Finland
A scenic reflection in the water of the illuminated city of Helsinki in Finland

Weather in May

The last month of the spring, May, is a mild month in Helsinki, Finland, with temperature in the range of an average low of 6.3°C (43.3°F) and an average high of 14.4°C (57.9°F).

Temperature

In Helsinki, the average high-temperature in May increases from a frosty 7.6°C (45.7°F) in April to a mild 14.4°C (57.9°F). In Helsinki, the average low-temperature is 6.3°C (43.3°F).

Rainfall

In May, in Helsinki, the rain falls for 11 days. Throughout May, 37mm (1.46") of precipitation is accumulated. Throughout the year, in Helsinki, Finland, there are 182 rainfall days, and 655mm (25.79") of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Sea temperature

In Helsinki, the average seawater temperature in May is 5°C (41°F).
Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

Daylight

The average length of the day in May in Helsinki is 17h and 14min.
On the first day of the month, sunrise is at 05:16 and sunset at 21:18. On the last day of May, sunrise is at 04:08 and sunset at 22:27 EEST.

Sunshine

In Helsinki, the average sunshine in May is 9.2h.

UV index

In Helsinki, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in May transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in May in Helsinki?

The average high-temperature, in May, in Helsinki, is 14.4°C (57.9°F), while the average low-temperature is 6.3°C (43.3°F).

How many days does it rain in May in Helsinki?

In Helsinki, Finland, in May, during 11 rainfall days, 37mm (1.46") of precipitation is typically accumulated.

When it does not snow in Helsinki?

In Helsinki, Finland, snow does not fall in April through October.

What is the sea water temperature in May in Helsinki?

In May, the average sea temperature in Helsinki is 5°C (41°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

How many hours of daylight does Helsinki have in May?

In May, the average day length in Helsinki is 17h and 14min.

When are sunrise and sunset in May in Helsinki?

On the first day of May, sunrise is at 05:16 and sunset at 21:18. On the last day of the month, sunrise is at 04:08 and sunset at 22:27 EEST.

How long on average sun shines in May in Helsinki?

The average sunshine duration in May in Helsinki is 9.2h.

How high is the UV index in May in Helsinki?

The average daily maximum UV index in May in Helsinki, Finland, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average rainfall days
Average snowfall
Average sea temperature
Average sunshine
Average UV index

Average temperature in May
Helsinki, Finland

Average temperature in May - Helsinki, Finland
  • 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).

  • 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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Average rainfall in May
Helsinki, Finland

Average rainfall in May - Helsinki, Finland
  • Average rainfall in May: 37mm

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

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Average rainfall days in May
Helsinki, Finland

Average rainfall days in May - Helsinki, Finland
  • Average rainfall days in May: 11 days

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

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Average snowfall in May
Helsinki, Finland

Average snowfall in May - Helsinki, Finland
  • Average snowfall in May: 0mm

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

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Average sea temperature in May
Helsinki, Finland

Average sea temperature in May - Helsinki, Finland
  • Average sea temperature in May: 5°C

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

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Average daylight in May /
Average sunshine in May
Helsinki, Finland

Average daylight in May / Average sunshine in May - Helsinki, Finland
  • Average daylight in May: 17h and 14min

The month with the longest days is June (Average daylight: 18h and 47min).
The month with the shortest days is December (Average daylight: 5h and 59min).

  • Average sunshine in May: 9h and 12min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 0h and 54min).

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Average UV index in May
Helsinki, Finland

Average UV index in May - Helsinki, Finland
  • Average UV index in May: 4

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

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