September weather forecast
Vaasa, Finland

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Weather in September

September witnesses Vaasa sliding into the mellow coolness of autumn. A dip in temperatures to around 13°C (55.4°F) is noticeable from August, bringing in a gradual chill. The decline in daylight hours becomes more pronounced, preparing the city for the eventual winter. Rainfall remains rather consistent, contributing to the damp and leaf-strewn streets of Vaasa. September rings in the autumnal season without fanfare, subtly changing the city's vibrant summer palette.

Temperature

The average high-temperature in Vaasa, Finland, drops in September, from August's refreshing 18°C (64.4°F) to a moderate 13°C (55.4°F). Vaasa observes an average low-temperature of 6°C (42.8°F) during September.

Rainfall

In Vaasa, Finland, in September, it is raining for 16 days, with typically 61mm (2.4") of accumulated precipitation. Throughout the year, in Vaasa, Finland, there are 182 rainfall days, and 493mm (19.41") of precipitation is accumulated.

Sea temperature

In Vaasa, in September, the average water temperature is 12.8°C (55°F).
Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

Daylight

In Vaasa, the average length of the day in September is 12h and 59min.
On the first day of the month, sunrise is at 06:21 and sunset at 20:45. On the last day of September, in Vaasa, sunrise is at 07:40 and sunset at 19:06 EEST.

Sunshine

In September, the average sunshine is 3h.

UV index

The average daily maximum UV index in September in Vaasa is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum high UV index of 2 in September translates into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. 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.

Frequently asked questions

What is the average September temperature in Vaasa?

The high-temperature, in September, in Vaasa, is 13°C (55.4°F), while the low-temperature averages to 6°C (42.8°F).

How many days does it rain in September in Vaasa?

In Vaasa, in September, during 16 rainfall days, 61mm (2.4") of precipitation is typically accumulated.

What is the water temperature in September in Vaasa?

In Vaasa, Finland, in September, the average water temperature is 12.8°C (55°F). Swimming in 12.8°C (55°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Vaasa have in September?

In Vaasa, the average day length in September is 12h and 59min.

What time are sunrise and sunset in September in Vaasa?

In September, on the first day of the month, sunrise is at 06:21 and sunset at 20:45. On the last day of the month, sunrise is at 07:40 and sunset at 19:06 EEST.

How many hours of sunshine does Vaasa have in September?

The average sunshine duration in September in Vaasa, Finland, is 3h.

What is the UV index reading in September in Vaasa?

In Vaasa, Finland, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Vaasa, Finland

Average temperature in September - Vaasa, Finland
  • Average high temperature in September: 13°C

The warmest month (with the highest average high temperature) is July (20°C).
The months with the lowest average high temperature are January and February (-5°C).

  • Average low temperature in September: 6°C

The month with the highest average low temperature is July (11°C).
The coldest months (with the lowest average low temperature) are January and February (-12°C).

Average rainfall in September
Vaasa, Finland

Average rainfall in September - Vaasa, Finland
  • Average rainfall in September: 61mm

The wettest month (with the highest rainfall) is August (62mm).
The driest month (with the least rainfall) is February (23mm).

Average rainfall days in September
Vaasa, Finland

Average rainfall days in September - Vaasa, Finland
  • Average rainfall days in September: 16 days

The month with the highest number of rainy days is January (21 days).
The months with the least rainy days are May and June (11 days).

Average sea temperature in September
Vaasa, Finland

Average sea temperature in September - Vaasa, Finland
  • Average sea temperature in September: 12.8°C

The best month for swimming (with the highest average sea temperature) is August (16.4°C).
The coldest month (with the lowest average sea temperature) is February (-0.3°C).

Average daylight in September /
Average sunshine in September
Vaasa, Finland

Average daylight in September / Average sunshine in September - Vaasa, Finland
  • Average daylight in September: 13h and 0min

The month with the longest days is June (Average daylight: 20h and 6min).
The month with the shortest days is December (Average daylight: 4h and 54min).

  • Average sunshine in September: 3h

The month with the most sunshine is June (Average sunshine: 9h).
The months with the least sunshine are January and December (Average sunshine: 0h).

Average UV index in September
Vaasa, Finland

Average UV index in September - Vaasa, Finland
  • Average UV index in September: 2

The month with the highest UV index is June (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 0).

Vaasa, Finland

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