September weather forecast
Vaasa, Finland

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.