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September Weather in Kostroma, Russian Federation

Last updated: August 27, 2025

In September, the average temperature in Kostroma, Russian Federation hovers around 11°C (52°F), with a minimum dipping to 0°C (33°F) and a maximum reaching 25°C (77°F). Expect about 77 mm (3.0 in) of rainfall spread over 14 days, contributing to an average humidity of a high 89%.

September Temperature in Kostroma

In September in Kostroma, the average temperature is 11°C (52°F), with maximums reaching 25°C (77°F) and minimums dropping as low as 0°C (33°F). It's a great time for travelers to enjoy mild weather while exploring the area's attractions.

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

The chart illustrates September temperature patterns in Kostroma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kostroma, September typically has an average temperature of 11°C (52°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec191927405361656252423122
Data source: Temperature data for Kostroma 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 Kostroma

In Kostroma in September, the precipitation amount is 77 mm (3.0 in) over the course of 14 days.

September Precipitation Trends in Kostroma

The chart displays monthly precipitation patterns in Kostroma, 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 Kostroma, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec455444476162847177746451
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kostroma

In Kostroma in September humidity is 89%. With an average temperature of 11°C (52°F), this humidity feels like a cool mist clinging to your skin, making outdoor activities feel damp and chilly, so it's essential to dress in layers and be prepared for a brisk experience while traveling.

September Average Humidity in Kostroma

This chart illustrates the average monthly humidity levels in Kostroma, 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 Kostroma is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec99%97%93%84%72%73%76%77%89%91%94%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kostroma

In Kostroma 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 Kostroma for better planning.

Maximum UV Index Levels in Kostroma for September

The chart shows the monthly maximum UV Index (UVI) for Kostroma 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 Kostroma typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124457764211
Data source: Kostroma 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 Kostroma Compares to Other Months

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

This table compares monthly weather conditions in Kostroma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)45 mm (1.8 inches)99%low
February Weather-7°C (20°F)54 mm (2.1 inches)97%low
March Weather-3°C (28°F)44 mm (1.7 inches)93%moderate
April Weather4°C (40°F)47 mm (1.9 inches)84%moderate
May Weather12°C (53°F)61 mm (2.4 inches)72%moderate
June Weather16°C (62°F)62 mm (2.5 inches)73%high
July Weather18°C (65°F)84 mm (3.3 inches)76%high
August Weather17°C (62°F)71 mm (2.8 inches)77%high
September Weather11°C (52°F)77 mm (3.0 inches)89%moderate
October Weather6°C (43°F)74 mm (2.9 inches)91%low
November Weather0°C (32°F)64 mm (2.5 inches)94%low
December Weather-6°C (22°F)51 mm (2.0 inches)92%low

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