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September Weather in Onega, Russian Federation

Last updated: August 27, 2025

In September, the average temperature in Onega, Russian Federation hovers around 10°C (51°F), with a minimum of 2°C (36°F) and a maximum of 20°C (69°F). This month also brings about 114 mm (4.5 in) of precipitation, typically spread over 16 days, contributing to an average humidity of 90%. Stay prepared for a mix of cool, damp days!

September Temperature in Onega

In September in Onega, the average temperature is 10°C (51°F). The maximum can reach 20°C (69°F), while the minimum can be as low as 2°C (36°F). This mild climate makes Onega a great destination for outdoor activities and exploring local attractions.

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

The chart illustrates September temperature patterns in Onega, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onega, September typically has an average temperature of 10°C (51°F), with highs reaching up to 20°C (69°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec191724334456625850403223
Data source: Temperature data for Onega 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 Onega

In Onega in September, the precipitation amount is 114 mm (4.5 in), occurring over a span of 16 days.

September Precipitation Trends in Onega

The chart displays monthly precipitation patterns in Onega, 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 Onega, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec514548384556871171141147260
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Onega

In Onega in September, humidity is 90%. With an average temperature of 10°C (51°F), this humidity feels like you are wrapped in a damp blanket, making traveling quite uncomfortable and sticky, as the air hangs heavy around you, often leading to fatigue and a longing for cooler, drier conditions.

September Average Humidity in Onega

This chart illustrates the average monthly humidity levels in Onega, 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 Onega is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec100%98%94%88%82%78%81%87%90%95%98%97%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Onega

In Onega 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 Onega, you can check the information here.

Maximum UV Index Levels in Onega for September

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

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

This table compares monthly weather conditions in Onega, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)51 mm (2.0 inches)100%low
February Weather-8°C (18°F)45 mm (1.8 inches)98%low
March Weather-4°C (24°F)48 mm (1.9 inches)94%low
April Weather1°C (33°F)38 mm (1.5 inches)88%moderate
May Weather7°C (44°F)45 mm (1.8 inches)82%moderate
June Weather13°C (56°F)56 mm (2.2 inches)78%high
July Weather16°C (62°F)87 mm (3.4 inches)81%high
August Weather15°C (59°F)117 mm (4.6 inches)87%moderate
September Weather10°C (51°F)114 mm (4.5 inches)90%moderate
October Weather5°C (40°F)114 mm (4.5 inches)95%low
November Weather0°C (32°F)72 mm (2.8 inches)98%low
December Weather-5°C (23°F)60 mm (2.4 inches)97%low

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