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September Weather in Ruhnu, Estonia

Last updated: August 23, 2025

In September, the average temperature in Ruhnu, Estonia is a comfortable 15°C (59°F), with minimums dipping to 8°C (47°F) and maximums reaching 21°C (71°F). Expect around 92 mm (3.6 in) of precipitation spread over 15 days, and experience a high average humidity of 87%. Perfect weather for enjoying the local scenery!

September Temperature in Ruhnu

In September in Ruhnu, the average temperature is 15°C (59°F), with maximums reaching 21°C (71°F) and minimums dipping as low as 8°C (47°F). This pleasant weather makes it an ideal time for travelers to explore the area comfortably.

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

The chart illustrates September temperature patterns in Ruhnu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ruhnu, September typically has an average temperature of 15°C (59°F), with highs reaching up to 21°C (71°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec343234394860656559514437
Data source: Temperature data for Ruhnu 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 Ruhnu

In Ruhnu in September, the precipitation amount is 92 mm (3.6 in) distributed over 15 days.

September Precipitation Trends in Ruhnu

The chart displays monthly precipitation patterns in Ruhnu, 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 Ruhnu, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec4843472835457791921088764
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ruhnu

In Ruhnu in September, humidity is 87%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket, making traveling uncomfortable as the air feels thick and stifling, often leaving you feeling hot and sticky even when the temperature isn't too high.

September Average Humidity in Ruhnu

This chart illustrates the average monthly humidity levels in Ruhnu, 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 Ruhnu is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%90%87%72%76%76%80%87%91%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ruhnu

In Ruhnu 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 Ruhnu for better planning.

Maximum UV Index Levels in Ruhnu for September

The chart shows the monthly maximum UV Index (UVI) for Ruhnu 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 Ruhnu typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123467764211
Data source: Ruhnu 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 Ruhnu Compares to Other Months

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

This table compares monthly weather conditions in Ruhnu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)48 mm (1.9 inches)93%low
February Weather0°C (32°F)43 mm (1.7 inches)91%low
March Weather1°C (34°F)47 mm (1.9 inches)90%moderate
April Weather4°C (39°F)28 mm (1.1 inches)87%moderate
May Weather9°C (48°F)35 mm (1.4 inches)72%high
June Weather16°C (60°F)45 mm (1.8 inches)76%high
July Weather18°C (65°F)77 mm (3.0 inches)76%high
August Weather18°C (65°F)91 mm (3.6 inches)80%high
September Weather15°C (59°F)92 mm (3.6 inches)87%moderate
October Weather11°C (51°F)108 mm (4.2 inches)91%low
November Weather7°C (44°F)87 mm (3.4 inches)92%low
December Weather3°C (37°F)64 mm (2.5 inches)93%low

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