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September Weather in Ostashkov, Russian Federation

Last updated: August 27, 2025

In Ostashkov, Russian Federation, the average temperature in September hovers around 11°C (53°F), with extremes ranging from a chilly 0°C (32°F) to a warm 25°C (77°F). Expect 92 mm (3.6 in) of precipitation spread over about 14 days, contributing to an average humidity of a high 89%. Prepare for a month where cozy attire is a must!

September Temperature in Ostashkov

In September in Ostashkov, the average temperature is 11°C (53°F). The maximum can reach 25°C (77°F) and the minimum can be as low as 0°C (32°F). Be sure to pack layers for your trip, as the weather can vary significantly from warm to chilly.

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

The chart illustrates September temperature patterns in Ostashkov, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ostashkov, September typically has an average temperature of 11°C (53°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec232329395261636153433426
Data source: Temperature data for Ostashkov 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 Ostashkov

In Ostashkov in September, the precipitation amount is 92 mm (3.6 in) over the course of 14 days.

September Precipitation Trends in Ostashkov

The chart displays monthly precipitation patterns in Ostashkov, 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 Ostashkov, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec46434948708811910892746463
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ostashkov

In Ostashkov in September humidity is 89%. With an average temperature of 11°C (53°F), this humidity feels like a thick, heavy blanket wrapping around you, making outdoor activities uncomfortable and causing fatigue during travel.

September Average Humidity in Ostashkov

This chart illustrates the average monthly humidity levels in Ostashkov, 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 Ostashkov is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%94%90%85%71%77%82%83%89%93%94%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ostashkov

In Ostashkov in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Ostashkov.

Maximum UV Index Levels in Ostashkov for September

The chart shows the monthly maximum UV Index (UVI) for Ostashkov 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 Ostashkov typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124567765211
Data source: Ostashkov 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 Ostashkov Compares to Other Months

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

This table compares monthly weather conditions in Ostashkov, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)46 mm (1.8 inches)97%low
February Weather-5°C (24°F)43 mm (1.7 inches)94%low
March Weather-1°C (30°F)49 mm (1.9 inches)90%moderate
April Weather4°C (39°F)48 mm (1.9 inches)85%moderate
May Weather11°C (52°F)70 mm (2.7 inches)71%high
June Weather16°C (62°F)88 mm (3.5 inches)77%high
July Weather17°C (63°F)119 mm (4.7 inches)82%high
August Weather16°C (62°F)108 mm (4.2 inches)83%high
September Weather11°C (53°F)92 mm (3.6 inches)89%moderate
October Weather6°C (43°F)74 mm (2.9 inches)93%low
November Weather1°C (34°F)64 mm (2.5 inches)94%low
December Weather-3°C (26°F)63 mm (2.5 inches)94%low

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