Helsinki
Finland
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Helsinki, Finland

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
April in Helsinki, Finland, is a chilly spring month, with average temperature varying between 0.8°C (33.4°F) and 7.6°C (45.7°F).

Temperature

In Helsinki, the average high-temperature rises, from a cold 1.6°C (34.9°F) in March, to a chilly 7.6°C (45.7°F). In April, the average low-temperature is 0.8°C (33.4°F).

Rainfall

The month with the least rainfall is April when the rain falls for 11 days and typically collects 32mm (1.3") of precipitation.

Snowfall

In April, in Helsinki, it doesn't snow. March is the latest month when it typically snows. In Helsinki, during the entire year, snow aggregates up to 740mm (29.1").

Sea temperature

In Helsinki, the average water temperature is 2°C (35.6°F).
Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

Daylight

In April, the average length of the day in Helsinki is 14.6h.

Sunshine

The average sunshine in April is 6.5h.

UV index

In April, the average daily maximum UV index in Helsinki is 3. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. 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.

What is the temperature in April in Helsinki?

In April, in Helsinki, the average high-temperature is 7.6°C (45.7°F), and the average low-temperature is 0.8°C (33.4°F).

How many days does it rain in April in Helsinki?

In Helsinki, Finland, during April, the rain falls for 11 days and regularly aggregates up to 32mm (1.3") of precipitation.

What is the driest month in Helsinki?

April is the month with the least rainfall in Helsinki. Rain falls for 11 days and accumulates 32mm (1.3") of precipitation.

Does it snow in Helsinki in April?

In April, in Helsinki, Finland, it doesn't snow. March is the latest month when it typically snows.

What is the sea temperature in April in Helsinki?

In Helsinki, the average seawater temperature in April is 2°C (35.6°F). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

How many hours of daylight does Helsinki have in April?

The average length of the day in April is 14.6h.

How many hours of sunshine does Helsinki have in April?

In April, the average sunshine in Helsinki is 6.5h.

What is the UV index intensity in April in Helsinki?

The average daily maximum UV index in April in Helsinki is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in April - Helsinki, Finland
  • Average high temperature in April: 7.6°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 April: 0.8°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 April - Helsinki, Finland
  • Average rainfall in April: 32mm

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

Average rainfall days in April - Helsinki, Finland
  • Average rainfall days in April: 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).

Average snowfall in April - Helsinki, Finland
  • Average snowfall in April: 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).

Average sea temperature in April - Helsinki, Finland
  • Average sea temperature in April: 2°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).

Average daylight in April / Average sunshine in April - Helsinki, Finland
  • Average daylight in April: 14.6h

The month with the longest days is June (Average daylight: 18.8h).
The month with shortest days is December (Average daylight: 6h).

  • Average sunshine in April: 6.5h

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

Average UV index in April - Helsinki, Finland
  • Average UV index in April: 3

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).