October 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
October, the same as September, in Helsinki, Finland, is a chilly autumn month, with average temperature ranging between max. 9°C (48.2°F) and min. 4.3°C (39.7°F).

Temperature

The average high-temperature, is 9°C (48.2°F), while the average low-temperature is 4.3°C (39.7°F).

Rainfall

In October, in Helsinki, the rain falls for 16 days. Throughout October, 76mm (3") of precipitation is accumulated. In Helsinki, during the entire year, the rain falls for 182 days and collects up to 655mm (25.8") of precipitation.

Snowfall

In Helsinki, it doesn't snow. In November, it regularly snows. Throughout the year, 740mm (29.1") of snow is accumulated.

Sea temperature

In October, the average sea temperature is 10°C (50°F). Swimming in 10°C (50°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.

Daylight

In Helsinki, the average length of the day in October is 10.1h.

Sunshine

The average sunshine in October is 3h.

UV index

In Helsinki, the average UV index in October is 1.

What is the temperature in October in Helsinki?

The average high-temperature, in October, in Helsinki, is 9°C (48.2°F), while the average low-temperature is 4.3°C (39.7°F).

How much does it rain in Helsinki in October?

In Helsinki, during October, the rain falls for 16 days and regularly aggregates up to 76mm (3") of precipitation.

Does it snow in Helsinki in October?

In Helsinki, Finland, in October, it doesn't snow. In November, it regularly snows.

What is the sea water temperature in October in Helsinki?

In October, the average sea temperature in Helsinki, Finland, is 10°C (50°F). Swimming in 10°C (50°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

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

In Helsinki, Finland, the average length of the day in October is 10.1h.

How long on average sun shines in October in Helsinki?

In October, the average sunshine is 3h.

What is the UV index reading in October in Helsinki?

In October, the average UV index in Helsinki is 1.
Average temperature in October - Helsinki, Finland
  • Average high temperature in October: 9°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 October: 4.3°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 October - Helsinki, Finland
  • Average rainfall in October: 76mm

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

Average rainfall days in October - Helsinki, Finland
  • Average rainfall days in October: 16 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 October - Helsinki, Finland
  • Average snowfall in October: 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 October - Helsinki, Finland
  • Average sea temperature in October: 10°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 October / Average sunshine in October - Helsinki, Finland
  • Average daylight in October: 10.1h

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 October: 3h

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 October - Helsinki, Finland
  • Average UV index in October: 1

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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