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September Weather in Onis, Spain

Last updated: August 27, 2025

In September, the average temperature in Onis, Spain is a comfortable 15°C (59°F), with minimums dipping to 5°C (41°F) and maximums soaring to 26°C (80°F). Expect around 109 mm (4.3 in) of precipitation spread over 17 days, contributing to an average humidity of 77%. Prepare for a mix of weather that keeps the atmosphere lively!

September Temperature in Onis

In September in Onis, the average temperature is 15°C (59°F). Maximum temperatures can reach 26°C (80°F), while the minimum can drop as low as 5°C (41°F). This range makes it a great time for travelers to explore comfortably during the day while enjoying cooler evenings.

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

The chart illustrates September temperature patterns in Onis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onis, September typically has an average temperature of 15°C (59°F), with highs reaching up to 26°C (80°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec394344475358626259534542
Data source: Temperature data for Onis 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 Onis

In Onis in September, the precipitation amount is 109 mm (4.3 in), occurring over the course of 17 days.

September Precipitation Trends in Onis

The chart displays monthly precipitation patterns in Onis, 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 Onis, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec115114126128133160117105109119179175
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Onis

In Onis in September, humidity is 77%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it essential to stay hydrated and choose light, breathable clothing for comfortable travel.

September Average Humidity in Onis

This chart illustrates the average monthly humidity levels in Onis, 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 Onis is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%83%83%84%84%86%78%77%82%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Onis

In Onis in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Onis.

Maximum UV Index Levels in Onis for September

The chart shows the monthly maximum UV Index (UVI) for Onis 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 Onis typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689111098532
Data source: Onis 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 Onis Compares to Other Months

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

This table compares monthly weather conditions in Onis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)114 mm (4.5 inches)87%low
February Weather6°C (43°F)114 mm (4.5 inches)85%moderate
March Weather7°C (44°F)126 mm (5.0 inches)83%high
April Weather9°C (48°F)128 mm (5.0 inches)83%very high
May Weather12°C (53°F)133 mm (5.2 inches)84%very high
June Weather14°C (58°F)160 mm (6.3 inches)84%extreme
July Weather17°C (62°F)117 mm (4.6 inches)86%very high
August Weather17°C (62°F)105 mm (4.1 inches)78%very high
September Weather15°C (59°F)109 mm (4.3 inches)77%very high
October Weather12°C (53°F)119 mm (4.7 inches)82%moderate
November Weather7°C (45°F)179 mm (7.0 inches)86%moderate
December Weather6°C (43°F)175 mm (6.9 inches)87%low

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