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September Weather in Sint-Jan, Belgium

Last updated: August 22, 2025

In Sint-Jan, Belgium, the average temperature in September hovers around 16°C (61°F). Expect a range with a minimum of 4°C (40°F) and a maximum of 32°C (89°F). During this month, you can anticipate about 51 mm (2.0 in) of precipitation spread over 9 days. With an average humidity level of 82%, be prepared for a comfortably cool and occasionally damp atmosphere.

September Temperature in Sint-Jan

In September in Sint-Jan, the average temperature is 16°C (61°F). Maximums can reach 32°C (89°F), while minimums can drop as low as 4°C (40°F). Travelers should be prepared for a wide range of temperatures, making it a great time for versatile dressing and outdoor activities.

September Weather in Sint-Jan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sint-Jan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sint-Jan, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (89°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec404346505664666660554643
Data source: Temperature data for Sint-Jan 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 Sint-Jan

In Sint-Jan in September, the total precipitation amount is 51 mm (2.0 in) spread over 9 days.

September Precipitation Trends in Sint-Jan

The chart displays monthly precipitation patterns in Sint-Jan, 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 Sint-Jan, September typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec655964366160507151825695
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sint-Jan

In Sint-Jan in September humidity is 82%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making travel feel a bit sluggish and requiring frequent breaks to hydrate and cool down.

September Average Humidity in Sint-Jan

This chart illustrates the average monthly humidity levels in Sint-Jan, 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 Sint-Jan 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 Sint-Jan

In Sint-Jan 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 Sint-Jan.

Maximum UV Index Levels in Sint-Jan for September

The chart shows the monthly maximum UV Index (UVI) for Sint-Jan 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 Sint-Jan typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Sint-Jan 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 Sint-Jan Compares to Other Months

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

This table compares monthly weather conditions in Sint-Jan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)65 mm (2.6 inches)91%low
February Weather6°C (43°F)59 mm (2.3 inches)89%low
March Weather8°C (46°F)64 mm (2.5 inches)87%moderate
April Weather10°C (51°F)36 mm (1.4 inches)85%moderate
May Weather13°C (57°F)61 mm (2.4 inches)82%high
June Weather18°C (64°F)60 mm (2.4 inches)82%very high
July Weather19°C (66°F)50 mm (2.0 inches)80%very high
August Weather19°C (66°F)71 mm (2.8 inches)76%high
September Weather16°C (61°F)51 mm (2.0 inches)82%moderate
October Weather13°C (55°F)82 mm (3.2 inches)89%moderate
November Weather8°C (47°F)56 mm (2.2 inches)92%low
December Weather6°C (43°F)95 mm (3.8 inches)92%low

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