May weather forecast
Helsinki, Finland

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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

May in Helsinki signals the onset of summer as the weather patterns make a noteworthy shift. Daylight dominates the day spanning 17.2h, which correspondents to amplified sunshine hours. A pleasant warmth envelops Helsinki, with a notable elevation in sea temperatures to 5°C (41°F), encouraging visitation to the city's coastal regions. Rainfall manifests moderately, aligning with the charming ambiance of pre-summer anticipation. All these elements invite outdoor activities, making May in Helsinki stimulating and vibrant.

Temperature

May in Helsinki shows a rise in the average high-temperature, moving from April's chilly 7.6°C (45.7°F) to a moderate 14.4°C (57.9°F). During the month of May, Helsinki's nighttime temperature lowers to an average of 6.3°C (43.3°F).

Rainfall

In Helsinki, in May, during 11 rainfall days, 37mm (1.46") of precipitation is typically 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 May, the average sea temperature is 5°C (41°F).
Note: Dipping in 5°C (41°F) at temperatures less than 10°C (50°F) without proper gear can lead to pronounced cold shock and breathing difficulties.

Daylight

In Helsinki, the average length of the day in May is 17h and 14min.
On the first day of the month, sunrise is at 05:15 and sunset at 21:19. On the last day of May, sunrise is at 04:08 and sunset at 22:27 EEST.

Sunshine

The average sunshine in May in Helsinki is 9.2h.

UV index

In Helsinki, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The daily high UV index of 4 during May translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Updated: Jan 31, 2024 | Published by: Weather Atlas | About Us

Frequently asked questions

What is the usual temperature for Helsinki in May?

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

How many days does it rain in May in Helsinki?

In May, in Helsinki, Finland, the rain falls for 11 days. Throughout May, 37mm (1.46") of precipitation is accumulated.

When it does not snow in Helsinki?

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

How cold is the water in May in Helsinki?

In Helsinki, the average seawater temperature in May is 5°C (41°F). Swimming in 5°C (41°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Helsinki have in May?

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

When are sunrise and sunset in May in Helsinki?

On the first day of May in Helsinki, sunrise is at 05:15 and sunset at 21:19. 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?

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

How high is the UV index in May in Helsinki?

In Helsinki, Finland, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average rainfall days
Average snowfall
Average sea temperature
Average daylight
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).

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).

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).

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).

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).

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 1min

The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).

  • Average sunshine in May: 9h and 1min

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).

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).

Helsinki, Finland

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