nomadseason

September Weather in Masku, Finland

Last updated: August 23, 2025

In September, the average temperature in Masku, Finland hovers around 12°C (54°F). Expect a chilly minimum of -1°C (31°F), while that warm spell can peak at a pleasant 23°C (73°F). Throughout the month, 72 mm (2.8 in) of precipitation is typical, falling over about 12 days. Be prepared for a cozy atmosphere, with an average humidity level of 86%.

September Temperature in Masku

In September in Masku, the average temperature is 12°C (54°F). The maximum can reach 23°C (73°F) and the minimum can be as low as -1°C (31°F). It's a great time to explore the area's outdoor activities and pack accordingly for varying weather conditions.

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

The chart illustrates September temperature patterns in Masku, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Masku, September typically has an average temperature of 12°C (54°F), with highs reaching up to 23°C (73°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec292731394960646254453932
Data source: Temperature data for Masku 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 Masku

In Masku in September, the total precipitation amount is 72 mm (2.8 in) over the course of 12 days.

September Precipitation Trends in Masku

The chart displays monthly precipitation patterns in Masku, 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 Masku, September typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec484244324443758772865979
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Masku

In Masku in September, humidity is 86%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities uncomfortable and travel challenging due to the heavy, muggy atmosphere.

September Average Humidity in Masku

This chart illustrates the average monthly humidity levels in Masku, 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 Masku 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 Masku

In Masku 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 Masku for better planning.

Maximum UV Index Levels in Masku for September

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

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

This table compares monthly weather conditions in Masku, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)48 mm (1.9 inches)92%low
February Weather-3°C (27°F)42 mm (1.7 inches)90%low
March Weather0°C (32°F)44 mm (1.7 inches)89%moderate
April Weather4°C (39°F)32 mm (1.3 inches)85%moderate
May Weather10°C (49°F)44 mm (1.7 inches)77%moderate
June Weather16°C (61°F)43 mm (1.7 inches)78%high
July Weather18°C (64°F)75 mm (3.0 inches)78%high
August Weather17°C (62°F)87 mm (3.4 inches)79%moderate
September Weather12°C (54°F)72 mm (2.8 inches)86%moderate
October Weather7°C (46°F)86 mm (3.4 inches)90%low
November Weather4°C (39°F)59 mm (2.3 inches)91%low
December Weather0°C (32°F)79 mm (3.1 inches)89%low

Compare Masku's Climate with Cities Worldwide