nomadseason

September Weather in Jakobstad, Finland

Last updated: August 23, 2025

In September, the average temperature in Jakobstad, Finland hovers around 11°C (52°F), with a minimum of 2°C (36°F) and a maximum reaching up to 22°C (72°F). Expect about 79 mm (3.1 in) of precipitation spread across 13 days, contributing to a notable average humidity level of 89%.

September Temperature in Jakobstad

In September in Jakobstad, the average temperature is 11°C (52°F), with maximums reaching up to 22°C (72°F) and minimums dropping as low as 2°C (36°F). This mild climate makes it a great time for travelers to explore the outdoors and enjoy various activities.

September Weather in Jakobstad: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Jakobstad, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jakobstad, September typically has an average temperature of 11°C (52°F), with highs reaching up to 22°C (72°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec262328354455625952433629
Data source: Temperature data for Jakobstad generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Jakobstad

In Jakobstad in September, the precipitation amount is 79 mm (3.1 in) over a span of 13 days.

September Precipitation Trends in Jakobstad

The chart displays monthly precipitation patterns in Jakobstad, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Jakobstad, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec384240374948648679946452
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Jakobstad

In Jakobstad in September humidity is 89%. With an average temperature of 11°C (52°F), this humidity feels like a cool mist clinging to your skin, making outdoor activities feel damp and chilly, so it's essential to dress in layers and be prepared for a brisk experience while traveling.

September Average Humidity in Jakobstad

This chart illustrates the average monthly humidity levels in Jakobstad, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Jakobstad is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%92%85%77%74%79%82%89%93%93%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Jakobstad

In Jakobstad in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Jakobstad, you can check the information here.

Maximum UV Index Levels in Jakobstad for September

The chart shows the monthly maximum UV Index (UVI) for Jakobstad in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Jakobstad typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: Jakobstad September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Jakobstad Compares to Other Months

Weather in Jakobstad varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Jakobstad, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Jakobstad, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)38 mm (1.5 inches)97%low
February Weather-5°C (23°F)41 mm (1.6 inches)95%low
March Weather-2°C (28°F)40 mm (1.6 inches)92%moderate
April Weather1°C (35°F)37 mm (1.5 inches)85%moderate
May Weather7°C (44°F)49 mm (1.9 inches)77%moderate
June Weather13°C (56°F)48 mm (1.9 inches)74%high
July Weather17°C (62°F)64 mm (2.5 inches)79%high
August Weather15°C (60°F)85 mm (3.4 inches)82%moderate
September Weather11°C (52°F)79 mm (3.1 inches)89%moderate
October Weather6°C (43°F)94 mm (3.7 inches)93%low
November Weather2°C (36°F)64 mm (2.5 inches)93%low
December Weather-1°C (30°F)52 mm (2.1 inches)95%low

Compare Jakobstad's Climate with Cities Worldwide