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September Weather in Merimasku, Finland

Last updated: August 23, 2025

In September, the average temperature in Merimasku, Finland is a mild 13°C (55°F). Expect a minimum of 1°C (33°F) and a maximum of 23°C (73°F), providing a comfortable range for various activities. However, be prepared for some rain, with an average precipitation of 67 mm (2.6 in) spread over 11 days. Don't forget to account for the high humidity, averaging at 86%, which can make the air feel warmer and more intense.

September Temperature in Merimasku

In September in Merimasku, the average temperature is 13°C (55°F), with maximums reaching up to 23°C (73°F) and minimums potentially dropping to as low as 1°C (33°F). This mild climate makes Merimasku a comfortable destination for travelers looking to explore the area without extreme weather conditions.

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

The chart illustrates September temperature patterns in Merimasku, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merimasku, September typically has an average temperature of 13°C (55°F), with highs reaching up to 23°C (73°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec302732394960646255464033
Data source: Temperature data for Merimasku generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Merimasku

In Merimasku in September, the total precipitation amount is 67 mm (2.6 in) over the course of 11 days.

September Precipitation Trends in Merimasku

The chart displays monthly precipitation patterns in Merimasku, 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 Merimasku, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec474143293840587067875980
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Merimasku

In Merimasku in September humidity is 86%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket clinging to your skin, making travel quite uncomfortable and urging you to seek cooler, dryer spots.

September Average Humidity in Merimasku

This chart illustrates the average monthly humidity levels in Merimasku, 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 Merimasku is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%89%85%77%78%78%79%86%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Merimasku

In Merimasku in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Merimasku for better planning.

Maximum UV Index Levels in Merimasku for September

The chart shows the monthly maximum UV Index (UVI) for Merimasku 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 Merimasku typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Merimasku 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 Merimasku Compares to Other Months

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

This table compares monthly weather conditions in Merimasku, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)47 mm (1.8 inches)92%low
February Weather-3°C (27°F)41 mm (1.6 inches)90%low
March Weather0°C (32°F)43 mm (1.7 inches)89%moderate
April Weather4°C (39°F)29 mm (1.1 inches)85%moderate
May Weather9°C (49°F)38 mm (1.5 inches)77%moderate
June Weather16°C (61°F)40 mm (1.6 inches)78%high
July Weather18°C (65°F)58 mm (2.3 inches)78%high
August Weather17°C (63°F)70 mm (2.7 inches)79%moderate
September Weather13°C (55°F)67 mm (2.6 inches)86%moderate
October Weather8°C (46°F)87 mm (3.4 inches)90%low
November Weather4°C (40°F)59 mm (2.3 inches)91%low
December Weather1°C (33°F)80 mm (3.1 inches)89%low

Compare Merimasku's Climate with Cities Worldwide