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September Weather in Riol, Germany

Last updated: August 23, 2025

In Riol, Germany, the average temperature in September hovers around 14°C (58°F). During this time, you can expect minimums of 3°C (37°F) and maximums reaching up to 31°C (88°F). With an average precipitation of 63 mm (2.5 in) over 9 days, it's wise to prepare for occasional rain. Don't forget, the average humidity is around 83%, adding a touch of stickiness to the warm air!

September Temperature in Riol

In September in Riol, the average temperature is 14°C (58°F). The maximum can reach 31°C (88°F), while the minimum can be as low as 3°C (37°F). Be prepared for a variety of weather conditions if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Riol, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riol, September typically has an average temperature of 14°C (58°F), with highs reaching up to 31°C (88°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec353842495564656558514138
Data source: Temperature data for Riol 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 Riol

In Riol in September, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.

September Precipitation Trends in Riol

The chart displays monthly precipitation patterns in Riol, 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 Riol, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7982944482807065647871135
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Riol

In Riol in September, humidity is 83%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket enveloping you, making exploration feel heavier and sweatier, so be prepared for a slower pace while traveling.

September Average Humidity in Riol

This chart illustrates the average monthly humidity levels in Riol, 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 Riol is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%88%84%81%82%82%80%83%89%91%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Riol

In Riol in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Riol, you can refer to this Hourly UV Index in Riol.

Maximum UV Index Levels in Riol for September

The chart shows the monthly maximum UV Index (UVI) for Riol 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 Riol typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234689876421
Data source: Riol 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 Riol Compares to Other Months

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

This table compares monthly weather conditions in Riol, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)79 mm (3.1 inches)91%low
February Weather3°C (38°F)82 mm (3.2 inches)90%moderate
March Weather6°C (42°F)94 mm (3.7 inches)88%moderate
April Weather9°C (49°F)44 mm (1.7 inches)84%high
May Weather13°C (55°F)82 mm (3.2 inches)81%very high
June Weather18°C (64°F)80 mm (3.2 inches)82%very high
July Weather19°C (66°F)70 mm (2.8 inches)82%very high
August Weather18°C (65°F)65 mm (2.5 inches)80%high
September Weather14°C (58°F)63 mm (2.5 inches)83%high
October Weather10°C (51°F)78 mm (3.1 inches)89%moderate
November Weather5°C (42°F)71 mm (2.8 inches)91%low
December Weather3°C (38°F)135 mm (5.3 inches)93%low

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