nomadseason

September Weather in Muonio, Finland

Last updated: August 23, 2025

In September, the average temperature in Muonio, Finland is a cool 7°C (44°F). Temperatures can vary significantly, with minimums dropping to -7°C (20°F) and maximums reaching up to 21°C (71°F). Expect 64 mm (2.5 in) of precipitation spread over 11 days, contributing to an average humidity of 91%.

September Temperature in Muonio

In September in Muonio, the average temperature is 7°C (44°F). Maximum temperatures can reach 21°C (71°F), while minimums can drop to as low as -7°C (20°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in Muonio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Muonio, September typically has an average temperature of 7°C (44°F), with highs reaching up to 21°C (71°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec121120303952595344312216
Data source: Temperature data for Muonio 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 Muonio

In Muonio in September, the total precipitation amount is 64 mm (2.5 in) spread over 11 days.

September Precipitation Trends in Muonio

The chart displays monthly precipitation patterns in Muonio, 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 Muonio, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec3433333455679110164825152
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Muonio

In Muonio in September humidity is 91%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor travel uncomfortable and a bit dreary, as the air hangs heavy and cold around you.

September Average Humidity in Muonio

This chart illustrates the average monthly humidity levels in Muonio, 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 Muonio is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec101%99%92%87%82%78%83%87%91%96%98%101%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Muonio

In Muonio 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 Muonio, you can check the information here.

Maximum UV Index Levels in Muonio for September

The chart shows the monthly maximum UV Index (UVI) for Muonio 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 Muonio typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112345543110
Data source: Muonio 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 Muonio Compares to Other Months

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

This table compares monthly weather conditions in Muonio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (12°F)34 mm (1.3 inches)101%low
February Weather-11°C (12°F)33 mm (1.3 inches)99%low
March Weather-7°C (21°F)33 mm (1.3 inches)92%low
April Weather-1°C (30°F)34 mm (1.3 inches)86%moderate
May Weather4°C (39°F)55 mm (2.2 inches)82%moderate
June Weather11°C (52°F)67 mm (2.6 inches)78%moderate
July Weather15°C (59°F)91 mm (3.6 inches)83%moderate
August Weather12°C (54°F)100 mm (4.0 inches)87%moderate
September Weather7°C (44°F)64 mm (2.5 inches)91%moderate
October Weather0°C (32°F)81 mm (3.2 inches)96%low
November Weather-6°C (22°F)51 mm (2.0 inches)98%low
December Weather-9°C (16°F)52 mm (2.0 inches)101%low

Compare Muonio's Climate with Cities Worldwide