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September Weather in Seilles, Belgium

Last updated: August 22, 2025

In September, the average temperature in Seilles, Belgium hovers around 15°C (59°F). Expect a refreshing range, with minimums dipping to 2°C (36°F) and maximums soaring to 34°C (93°F). During this month, rainfall totals approximately 65 mm (2.6 in) across 11 days, while the air carries a notable average humidity of 82%.

September Temperature in Seilles

In September in Seilles, the average temperature is 15°C (59°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 2°C (36°F). This variation in temperature makes Seilles an ideal destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Seilles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seilles, September typically has an average temperature of 15°C (59°F), with highs reaching up to 34°C (93°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec384144495664666559534441
Data source: Temperature data for Seilles 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 Seilles

In Seilles in September, the precipitation amount is 65 mm (2.6 in) over a span of 11 days.

September Precipitation Trends in Seilles

The chart displays monthly precipitation patterns in Seilles, 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 Seilles, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7174794167797986658459108
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seilles

In Seilles in September, humidity is 82%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and uncomfortable for travelers.

September Average Humidity in Seilles

This chart illustrates the average monthly humidity levels in Seilles, 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 Seilles is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%85%82%82%80%76%82%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seilles

In Seilles 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 Seilles.

Maximum UV Index Levels in Seilles for September

The chart shows the monthly maximum UV Index (UVI) for Seilles 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 Seilles typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234578875421
Data source: Seilles 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 Seilles Compares to Other Months

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

This table compares monthly weather conditions in Seilles, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)71 mm (2.8 inches)91%low
February Weather5°C (41°F)74 mm (2.9 inches)89%moderate
March Weather7°C (44°F)79 mm (3.1 inches)87%moderate
April Weather10°C (50°F)41 mm (1.6 inches)85%moderate
May Weather13°C (56°F)67 mm (2.6 inches)82%high
June Weather18°C (64°F)79 mm (3.1 inches)82%very high
July Weather19°C (66°F)79 mm (3.1 inches)80%very high
August Weather19°C (66°F)86 mm (3.4 inches)76%high
September Weather15°C (59°F)65 mm (2.6 inches)82%moderate
October Weather12°C (53°F)84 mm (3.3 inches)89%moderate
November Weather7°C (44°F)59 mm (2.3 inches)92%low
December Weather5°C (41°F)108 mm (4.3 inches)92%low

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