October 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 October

October in Helsinki features an escalating autumn chill, culminating in a bracing climatic experience. With sea temperatures retreating to 10°C (50°F) and with daylight hours decreasing to 10.1h, the city prepares for the winter ahead. The first impressions of winter's chill can be sensed by the month-end, signifying the closing phase of autumn. Rainfall occurrence remains moderate, contributing to the damp, crisp atmosphere typical of the autumn season.

Temperature

The onset of October comes with a shift in the average high-temperature, falling from a mild 14.6°C (58.3°F) in September to a chilly 9°C (48.2°F). Throughout the nights in October, Helsinki notes an average low of 4.3°C (39.7°F), a small dip from the daytime peak.

Rainfall

In Helsinki, in October, during 16 rainfall days, 76mm (2.99") of precipitation is typically accumulated. In Helsinki, during the entire year, the rain falls for 182 days and collects up to 655mm (25.79") of precipitation.

Snowfall

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

Sea temperature

In Helsinki, in October, the average water temperature is 10°C (50°F).
Note: While a brief time in 10°C (50°F) at 13°C (55.4°F) is already bracing, plunging below 10°C (50°F) can severely affect breathing and introduce a cold shock, relying on your physical state.

Daylight

In Helsinki, the average length of the day in October is 10h and 7min.
On the first day of October in Helsinki, sunrise is at 07:27 and sunset at 18:52 EEST. On the last day of the month, sunrise is at 07:41 and sunset at 16:25 EET.
Note: On Sunday, 27. October 2024, at 04:00, Daylight Saving Time ends, and the time zone changes from EEST to EET. Daylight Saving Time starts again on Sunday, 30. March 2025, at 03:00; consequently, the time zone reverts from EET to EEST.

Sunshine

The average sunshine in October in Helsinki, Finland, is 3h.

UV index

In Helsinki, Finland, the average daily maximum UV index in October is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 1 during October translates into the following guidance:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.

Frequently asked questions

What is the temperature in October in Helsinki?

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

How many days does it rain in October in Helsinki?

In October, in Helsinki, the rain falls for 16 days. Throughout October, 76mm (2.99") of precipitation is accumulated.

When it does not snow in Helsinki?

April through October are months without snowfall.

Does it snow in Helsinki in October?

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

How cold is the water in October in Helsinki?

In October, the average sea temperature in Helsinki 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 day length in October is 10h and 7min.

What time are sunrise and sunset in October in Helsinki?

In October, on the first day of the month, sunrise is at 07:27 and sunset at 18:52 EEST. On the last day of the month, in Helsinki, Finland, sunrise is at 07:41 and sunset at 16:25 EET.

When does Daylight Saving Time (DST) end in October in Helsinki?

On Sunday, 27. October 2024, at 04:00, Daylight Saving Time ends, and the time zone changes from EEST to EET. The next DST starts on Sunday, 30. March 2025, at 03:00.

How many hours of sunshine does Helsinki have in October?

In October, the average sunshine duration in Helsinki, Finland, is 3h.

What is the UV index reading in October in Helsinki?

In Helsinki, the average daily maximum UV index in October is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Average rainfall days
Average snowfall
Average daylight
Average sunshine
Average UV index

Average temperature in October
Helsinki, Finland

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 - Helsinki, Finland
  • Average rainfall in October: 76mm

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

Average rainfall days in October
Helsinki, Finland

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).
The months with the least rainy days are April and May (11 days).

Average snowfall in October
Helsinki, Finland

Average snowfall in October - Helsinki, Finland
  • Average snowfall in October: 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 October
Helsinki, Finland

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).
The 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 / Average sunshine in October - Helsinki, Finland
  • Average daylight in October: 10h 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 October: 3h and 0min

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 October
Helsinki, Finland

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

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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