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

January 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
January, the same as December, in Helsinki, Finland, is a freezing cold winter month, with average temperature varying between -6.5°C (20.3°F) and -1.3°C (29.7°F).

Temperature

In January, the average high-temperature is relatively the same as in December - a subzero cold -1.3°C (29.7°F). In January, the average low-temperature is -6.5°C (20.3°F).

Rainfall

In Helsinki, in January, it is raining for 19 days, with typically 52mm (2.05") of accumulated precipitation. Throughout the year, there are 182 rainfall days, and 655mm (25.79") of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall in Helsinki. In Helsinki, 210mm (8.27") of snow is typically accumulated. Throughout the year, 740mm (29.13") of snow is accumulated.

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

The average length of the day in Helsinki is 6.8h.

Sunshine

In January, the average sunshine is 1.2h.

UV index

Months with the lowest UV index in Helsinki, Finland, are January, February, November and December, with an average maximum UV index of 0. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In January, the average maximum UV index of 0 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in January in Helsinki?

The average high-temperature, in January, in Helsinki, Finland, is -1.3°C (29.7°F), while the average low-temperature is -6.5°C (20.3°F).

How much does it rain in Helsinki in January?

In January, in Helsinki, the rain falls for 19 days. Throughout January, 52mm (2.05") of precipitation is accumulated.

How much does it snow in Helsinki in January?

Throughout January, in Helsinki, Finland, 210mm (8.27") of snow is accumulated.

What is the water temperature in January in Helsinki?

In Helsinki, Finland, in January, the average water temperature 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.

What is the average length of the day in January in Helsinki?

The average length of the day in January in Helsinki, Finland, is 6.8h.

How long on average sun shines in January in Helsinki?

In January, the average sunshine in Helsinki, Finland, is 1.2h.

What are the months with the lowest UV index in Helsinki?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 0.

What is the UV index reading in January in Helsinki?

In Helsinki, Finland, the average daily maximum UV index in January is 0. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.
Average temperature in January - Helsinki, Finland
  • Average high temperature in January: -1.3°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 January: -6.5°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 January - Helsinki, Finland
  • Average rainfall in January: 52mm

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

Average rainfall days in January - Helsinki, Finland
  • Average rainfall days in January: 19 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 January - Helsinki, Finland
  • Average snowfall in January: 210mm

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 January - Helsinki, Finland
  • Average sea temperature in January: 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 January / Average sunshine in January - Helsinki, Finland
  • Average daylight in January: 6.8h

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 January: 1.2h

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 January - Helsinki, Finland
  • Average UV index in January: 0

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).