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September Weather in Kostomuksha, Russian Federation

Last updated: August 27, 2025

In September, the average temperature in Kostomuksha, Russian Federation hovers around 8°C (47°F), with a range that can dip as low as -3°C (27°F) and peak at 23°C (73°F). Expect about 81 mm (3.2 in) of precipitation over approximately 13 days, contributing to an average humidity level of 91%. Plan accordingly for a damp and cool climate!

September Temperature in Kostomuksha

In September, in Kostomuksha, the average temperature is 8°C (47°F). Maximum temperatures can reach 23°C (73°F), while minimums can drop as low as -3°C (27°F). Be prepared for a range of weather conditions when traveling during this time.

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

The chart illustrates September temperature patterns in Kostomuksha, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kostomuksha, September typically has an average temperature of 8°C (47°F), with highs reaching up to 23°C (73°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec161523334457605647372922
Data source: Temperature data for Kostomuksha 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 Kostomuksha

In Kostomuksha in September, the precipitation amount is 81 mm (3.2 in) over the course of 13 days.

September Precipitation Trends in Kostomuksha

The chart displays monthly precipitation patterns in Kostomuksha, 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 Kostomuksha, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec4437434165718010481846460
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kostomuksha

In Kostomuksha in September, humidity is 91%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making it important to dress in layers while traveling.

September Average Humidity in Kostomuksha

This chart illustrates the average monthly humidity levels in Kostomuksha, 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 Kostomuksha is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec101%99%93%88%84%80%83%88%91%96%97%101%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kostomuksha

In Kostomuksha 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 Kostomuksha, you can check the information here.

Maximum UV Index Levels in Kostomuksha for September

The chart shows the monthly maximum UV Index (UVI) for Kostomuksha 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 Kostomuksha typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112356653211
Data source: Kostomuksha 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 Kostomuksha Compares to Other Months

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

This table compares monthly weather conditions in Kostomuksha, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)44 mm (1.7 inches)101%low
February Weather-9°C (15°F)37 mm (1.5 inches)99%low
March Weather-5°C (23°F)43 mm (1.7 inches)93%low
April Weather1°C (33°F)41 mm (1.6 inches)88%moderate
May Weather7°C (44°F)65 mm (2.5 inches)84%moderate
June Weather14°C (57°F)71 mm (2.8 inches)80%high
July Weather16°C (61°F)80 mm (3.2 inches)82%high
August Weather14°C (57°F)104 mm (4.1 inches)88%moderate
September Weather8°C (47°F)81 mm (3.2 inches)91%moderate
October Weather3°C (38°F)84 mm (3.3 inches)96%low
November Weather-2°C (29°F)64 mm (2.5 inches)97%low
December Weather-6°C (22°F)60 mm (2.4 inches)101%low

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