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September Weather in Mortier, Belgium

Last updated: August 22, 2025

In September, the average temperature in Mortier, Belgium hovers around 15°C (59°F), with minimums dipping to 2°C (37°F) and maximums climbing to 33°C (91°F). Expect about 64 mm (2.5 in) of precipitation spread over 10 days, contributing to an average humidity level of approximately 81%.

September Temperature in Mortier

In September in Mortier, the average temperature is 15°C (59°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (37°F). It's advisable to pack layers to adapt to the wide temperature range while enjoying your travels.

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

The chart illustrates September temperature patterns in Mortier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mortier, September typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec384144495664666659534441
Data source: Temperature data for Mortier 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 Mortier

In Mortier in September, the precipitation amount is 64 mm (2.5 in) over a span of 10 days.

September Precipitation Trends in Mortier

The chart displays monthly precipitation patterns in Mortier, 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 Mortier, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7880873969888778648559113
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mortier

In Mortier in September humidity is 81%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket draped over you, making traveling quite uncomfortable as you constantly wipe away beads of sweat and feel the stickiness clinging to your clothes.

September Average Humidity in Mortier

This chart illustrates the average monthly humidity levels in Mortier, 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 Mortier is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%87%84%77%74%72%71%81%88%91%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mortier

In Mortier 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 Mortier.

Maximum UV Index Levels in Mortier for September

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

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

This table compares monthly weather conditions in Mortier, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)78 mm (3.1 inches)91%low
February Weather5°C (41°F)80 mm (3.1 inches)90%low
March Weather7°C (45°F)87 mm (3.4 inches)87%moderate
April Weather10°C (50°F)39 mm (1.5 inches)84%moderate
May Weather13°C (56°F)68 mm (2.7 inches)77%high
June Weather18°C (65°F)88 mm (3.5 inches)74%very high
July Weather19°C (66°F)87 mm (3.4 inches)72%very high
August Weather19°C (66°F)78 mm (3.1 inches)71%high
September Weather15°C (59°F)64 mm (2.5 inches)81%moderate
October Weather12°C (53°F)85 mm (3.3 inches)88%moderate
November Weather7°C (44°F)59 mm (2.3 inches)91%low
December Weather5°C (41°F)113 mm (4.4 inches)92%low

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