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September Weather in Simo, Finland

Last updated: August 23, 2025

In September, the average temperature in Simo, Finland hovers around 9°C (48°F). Expect a minimum chill of -6°C (21°F) and a balmy maximum of 21°C (70°F). With 75 mm (3.0 in) of precipitation spread across 12 days, you might want to keep an umbrella handy! The average humidity is a high 89%, adding to the cool yet damp atmosphere.

September Temperature in Simo

In September in Simo, the average temperature is 9°C (48°F), with maximums reaching 21°C (70°F) and minimums dipping as low as -6°C (21°F). It's advisable to pack layers to accommodate both warm and chilly weather while exploring.

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

The chart illustrates September temperature patterns in Simo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simo, September typically has an average temperature of 9°C (48°F), with highs reaching up to 21°C (70°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec161523334457635748382922
Data source: Temperature data for Simo 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 Simo

In Simo in September, the precipitation amount is 75 mm (3.0 in) over the course of 12 days.

September Precipitation Trends in Simo

The chart displays monthly precipitation patterns in Simo, 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 Simo, September typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec494650405162628675857167
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Simo

In Simo in September humidity is 89%. With an average temperature of 9°C (48°F), this humidity feels like a chill that lingers in the air, wrapping around you like a damp blanket, making outdoor activities challenging and encouraging a cozy retreat indoors.

September Average Humidity in Simo

This chart illustrates the average monthly humidity levels in Simo, 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 Simo is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec99%97%93%86%80%76%79%83%89%94%94%98%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Simo

In Simo 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 Simo, you can check the information here.

Maximum UV Index Levels in Simo for September

The chart shows the monthly maximum UV Index (UVI) for Simo 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 Simo typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112456643211
Data source: Simo 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 Simo Compares to Other Months

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

This table compares monthly weather conditions in Simo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)49 mm (1.9 inches)99%low
February Weather-9°C (16°F)46 mm (1.8 inches)97%low
March Weather-5°C (24°F)50 mm (2.0 inches)93%low
April Weather0°C (33°F)40 mm (1.6 inches)86%moderate
May Weather7°C (45°F)51 mm (2.0 inches)80%moderate
June Weather14°C (57°F)62 mm (2.4 inches)76%high
July Weather17°C (63°F)62 mm (2.4 inches)79%high
August Weather14°C (58°F)86 mm (3.4 inches)83%moderate
September Weather9°C (48°F)75 mm (3.0 inches)89%moderate
October Weather3°C (38°F)85 mm (3.3 inches)94%low
November Weather-2°C (30°F)71 mm (2.8 inches)94%low
December Weather-5°C (22°F)67 mm (2.7 inches)98%low

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