September Weather in Koksijde, Belgium

Last updated: August 21, 2025

September in Koksijde, Belgium, offers a charming blend of late-summer warmth and early autumn coolness. With maximum temperatures reaching up to 31°C (87°F), the month provides pleasant days ideal for outdoor exploration. The average temperature settles comfortably at 16°C (61°F), while cooler nights drop to a refreshing minimum of 6°C (42°F). Though occasional rain is likely, with 52 mm (2.0 in) falling over 9 days, the high humidity at 82% adds a touch of softness to the sea breeze. This transitional month makes Koksijde a delightful destination for visitors seeking both sun and serenity.

September Temperature in Koksijde

In September, Koksijde experiences a delightful transition from the summer heat to the cooler embrace of autumn. The temperatures in this coastal town range from a mild 6°C (42°F) at night to a pleasant 31°C (87°F) during the day, making it one of the warmest months of the year. As the average temperature hovers around 16°C (61°F), visitors can enjoy the lingering warmth while witnessing the vibrant changes in the landscape. This month marks a gradual decline from the sweltering days of July and August, where maximums reached into the high 30s, yet still offers a taste of summer's final days. September in Koksijde is a perfect time for beach walks or exploring the scenic surroundings before the colder months set in.

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

The chart illustrates September temperature patterns in Koksijde, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koksijde, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec414346505663656561554744
Data source: Temperature data for Koksijde 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 Koksijde

In September, Koksijde experiences a moderate precipitation level of 52 mm (2.0 in), marking a decline compared to the preceding months. This month typically features around 9 rainy days, reflecting a slight improvement in weather conditions as the summer wraps up. Notably, September's rainfall is lower than the preceding August, which recorded 70 mm (2.8 in) over 12 days. As the region transitions into autumn, these trends suggest a gradual reduction in both the quantity and frequency of rainfall, paving the way for the wetter months ahead, particularly October, which often sees a surge in precipitation.

September Precipitation Trends in Koksijde

The chart displays monthly precipitation patterns in Koksijde, 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 Koksijde, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec625760366167557052825694
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Koksijde

As the seasons transition, September in Koksijde, Belgium, experiences a notable shift in humidity levels. After the summer months, where humidity dipped to 76% in August, September sees a resurgence to 82%. This slight increase reflects the typical change as the region moves towards autumn. Notably, the humidity begins to rise again in October, reaching 89%, suggesting that the crispness of fall is accompanied by a return to wetter air. Overall, September stands out as a bridge between the drier summer and the more humid autumn months, encapsulating the dynamic climate of Koksijde.

September Average Humidity in Koksijde

This chart illustrates the average monthly humidity levels in Koksijde, 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 Koksijde is approximately {2}%, 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 Koksijde

As the summer wanes in Koksijde, Belgium, the UV Index experiences a notable decline in September, settling at a moderate level of 5. This suggests that while sun exposure is less intense compared to the peak summer months, individuals should still be mindful of their time in the sun, with a burn time of approximately 30 minutes. This month marks a transition from the very high UV levels of July and August, emphasizing the importance of protective measures even as the temperatures begin to cool. As autumn approaches, it's essential to stay informed about sun safety. For more detailed insights into Koksijde's UV Index throughout the year, visit Koksijde UV Index.

Maximum UV Index Levels in Koksijde for September

The chart shows the monthly maximum UV Index (UVI) for Koksijde 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 Koksijde typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Koksijde 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.

September Sunshine in Koksijde

September in Koksijde, Belgium, showcases a delightful transition as the summer sun begins to wane, offering 328 hours of sunshine. This marks a decrease from the sun-soaked peak of 425 hours in July, yet still provides a brilliant escape before autumn fully sets in. Following a summer of abundant light, with August recording 395 hours, September's warmth continues to entice visitors, promising ample daylight for outdoor adventures. As the days shorten and the October chill approaches, the steady decline in sunshine hours emphasizes the fleeting beauty of this late-summer month, encouraging residents and tourists alike to soak up every radiant moment.

Monthly Sunshine Duration in Koksijde: September Highlighted

The September sunshine duration represents the total number of hours Koksijde experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec122h200h283h357h411h419h425h395h328h248h203h158h
Data source: Koksijde September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Koksijde During September

As September rolls in, Koksijde, Belgium, offers a refreshing transition into autumn with a 37% chance of sunny weather. This marks a notable increase from the preceding summer months, where sunshine probabilities hover around the low to mid-30s. Interestingly, the chance of sun in September falls just slightly above the average of the year, showing a gradual descent from the more sunlit months of April and March, which boast a peak of 51%. The shifting patterns indicate that while the vibrant summer fades, the early autumn days still provide a delightful opportunity for basking in the sun, making September a charming time for outdoor activities and exploration in this coastal town.

Percentage of Sunny Days in September in Koksijde

The chart illustrates the percentage of sunny days in Koksijde throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Koksijde experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec15%30%39%51%36%33%36%34%37%32%21%16%
Data source: Koksijde September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Koksijde in September

As summer fades into autumn in Koksijde, Belgium, September marks a gentle transition, with daylight duration tapering to 12 hours. This month strikes a harmonious balance between the long, sun-filled days of summer—where June boasts an impressive 16 hours of daylight—and the shorter days ahead, as October shrinks back to 10 hours. With each passing day in September, the golden hour becomes more precious, gradually yielding to the cozy ambiance of fall. The changing light not only alters the landscape but also invites locals and visitors alike to savor the lingering days of warmth before embracing the cooler months that follow.

Average Daylight Hours in Koksijde for September

The chart illustrates the variation in daylight duration in Koksijde throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 29m10h 1m11h 55m13h 51m15h 33m16h 25m15h 57m14h 26m12h 34m10h 38m8h 55m8h
Data source: Koksijde daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Koksijde

As summer gracefully transitions to autumn, September in Koksijde, Belgium, showcases a gentle shift in the wind. With an average wind speed of 3.3 m/s (7 mph), September enjoys one of the calmest breezes of the year, reminiscent of the slowing rhythm of nature. This dip follows a season of slightly stronger winds, peaking in late spring and early summer. As the month unfolds, the winds whisper of change, hinting at the brisk gusts awaiting in October, where speeds pick up to 4.6 m/s (10 mph). Observing this trend, one can appreciate how September’s tranquility serves as a serene prelude to the more vigorous winds of fall, making it an ideal time for leisurely strolls along the beach and reflecting on the transitioning seasons.

Average September Wind Speed in Koksijde

The chart displays monthly wind speed patterns in Koksijde, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.84.54.14.43.13.74.03.3 m/s4.63.84.5
Data source: Koksijde September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Koksijde Compares to Other Months

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

September and January showcase stark contrasts in weather. In September, temperatures range from a mild 6°C (42°F) at night to a warm 31°C (87°F) during the day, with an average of 16°C (61°F). The month typically sees 52 mm (2.0 in) of precipitation over 9 days, with humidity levels around 82%. In contrast, January is considerably colder, featuring minimum temperatures of -6°C (21°F) and maximums of 15°C (59°F) with an average of just 5°C (41°F). This winter month experiences a bit more precipitation, totaling 62 mm (2.4 in) over 12 days, and has higher humidity at 91%. For a closer look at how January weather unfolds, check out Koksijde weather in January.

September and February present strikingly different weather patterns. In September, temperatures range from a mild 6°C (42°F) to a warm 31°C (87°F), with an average of 16°C (61°F). This month sees about 52 mm (2.0 in) of precipitation over approximately 9 days and has a humidity level of 82%. On the other hand, February experiences much cooler temperatures, with minima plummeting to -6°C (21°F) and a maximum of 18°C (65°F), averaging only 6°C (43°F). Precipitation slightly increases to 57 mm (2.2 in) across 12 days, accompanied by a higher humidity of 89%. For a more detailed look at February weather, you can visit Koksijde weather in February.

In comparing the weather between September and March, one can notice significant differences. September experiences milder temperatures, with averages around 16°C (61°F) and maximums reaching 31°C (87°F), while March is much cooler, averaging only 8°C (46°F) and having a maximum of 22°C (72°F). Additionally, precipitation is slightly higher in March, totaling 60 mm (2.3 in) over 13 days, compared to September's 52 mm (2.0 in) spread over 9 days. Humidity levels are also higher in March at 87%, compared to 82% in September, contributing to a damp chill during the early spring. For more specifics about the conditions in March, check out Koksijde weather in March.

September and April present notable differences in weather patterns. September boasts warmer temperatures, with averages around 16°C (61°F), and can reach highs of 31°C (87°F), while April's temperatures are cooler, averaging 10°C (50°F) and peaking at 26°C (78°F). Both months experience around 9 days of precipitation, but September has slightly higher rainfall at 52 mm (2.0 in) compared to April's 36 mm (1.4 in). Humidity levels are quite similar, with September at 82% and April slightly higher at 85%. For more detailed insights into April weather, check out Koksijde weather in April.

In comparing the weather of September and May, we see notable differences in temperature and precipitation. September tends to be warmer with a minimum temperature of 6°C (42°F) and an average of 16°C (61°F), peaking at a maximum of 31°C (87°F). In contrast, May has cooler averages, with a minimum of 2°C (36°F) and an average temperature of 13°C (56°F), reaching a maximum of 28°C (82°F). While September experiences about 52 mm (2.0 in) of precipitation over 9 days, May sees slightly higher rainfall at 61 mm (2.4 in) over 11 days. Both months share the same humidity level of 82%. For more detailed insights, you can check out Koksijde weather in May.

In comparing the weather of September and June, both months display similar humidity levels of 82%, contributing to a muggy feel. September tends to have a slightly wider temperature range, with minimums dipping to 6°C (42°F) and maximums reaching up to 31°C (87°F), while June starts with a minimum of 7°C (45°F) and peaks at 32°C (90°F). Additionally, June experiences a bit more precipitation, averaging 67 mm (2.6 in) over 10 days compared to September's 52 mm (2.0 in) over 9 days. For a detailed look at June weather specifics, you can visit Koksijde weather in June.

When comparing the weather in September and July, we see notable differences in temperature and precipitation. September experiences a broader temperature range, with minimums dipping to 6°C (42°F) and maximums reaching up to 31°C (87°F), while the average temperature hovers around 16°C (61°F). In contrast, July is generally warmer, with minimums of 10°C (50°F) and maximums soaring to 39°C (102°F), averaging 19°C (66°F). Both months have similar precipitation levels, with July recording 55 mm (2.1 in) over 11 days and September 52 mm (2.0 in) over 9 days. Humidity is slightly higher in September at 82% compared to July's 80%. For more details on July weather, you can visit Koksijde weather in July.

In comparing the weather between September and August, September generally experiences cooler temperatures, with a minimum of 6°C (42°F) and an average of 16°C (61°F), while August has higher temperatures, starting at a minimum of 9°C (49°F) and averaging 19°C (66°F). The maximum temperatures in August reach up to 35°C (96°F), in contrast to September’s peak of 31°C (87°F). Precipitation is also notably different, as September sees 52 mm (2.0 in) over 9 days, compared to August's 70 mm (2.8 in) over 12 days. Additionally, September features higher humidity levels at 82%, compared to August’s 76%. For a closer look at August weather, you can check Koksijde weather in August.

September and October exhibit a noticeable shift in weather patterns. In September, temperatures range from a minimum of 6°C (42°F) to a maximum of 31°C (87°F), with an average of 16°C (61°F). This month also sees less precipitation, totaling 52 mm (2.0 in) over 9 days and a lower humidity level of 82%. In contrast, October experiences cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 25°C (77°F), averaging 13°C (55°F). Additionally, it is wetter, receiving 82 mm (3.2 in) of rain over 14 days, along with an increase in humidity to 89%. To learn more about the specifics of October weather, visit Koksijde weather in October.

September and November showcase a stark contrast in weather conditions. In September, temperatures range from a mild 6°C (42°F) at night to a warm maximum of 31°C (87°F) during the day, with an average of 16°C (61°F). The month experiences 52 mm (2.0 in) of precipitation over 9 days, accompanied by a relatively high humidity level of 82%. In contrast, November brings much cooler temperatures, with a minimum of 0°C (31°F) and a maximum of 19°C (66°F), averaging just 8°C (47°F). This month sees slightly more precipitation at 56 mm (2.2 in), spread over 11 days, and a higher humidity level of 92%. For more detailed information on November conditions, you can visit Koksijde weather in November.

In comparing the weather between September and December, a notable shift is evident. September boasts a more pleasant temperature range with minimums of 6°C (42°F) and maximums reaching as high as 31°C (87°F), offering an average of 16°C (61°F). The month typically sees 52 mm (2.0 in) of precipitation over about 9 days, with humidity at a comfortable 82%.

In contrast, December brings much cooler temperatures, with minimums dropping to -3°C (27°F) and maximums only reaching 14°C (58°F). The average temperature in December hovers around 6°C (44°F), while precipitation increases significantly to 94 mm (3.7 in) over 17 rainy days, accompanied by higher humidity at 92%. For more details on December weather, visit Koksijde weather in December.

Compare Koksijde's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Koksijde

As September unfolds in Koksijde, the weather presents a distinctive charm, melding the warmth of lingering summer with the crispness of approaching autumn. With temperatures reaching their peak highs and a comfortable average, this month offers a refreshing transition, marked by occasional rainfall and elevated humidity. While it might not boast the unwavering sunshine of July and August, September's mix of mild days and rejuvenating breezes creates an inviting atmosphere perfect for exploration. For a deeper dive into what to expect throughout the year, check out Koksijde Climate.