September Weather in Knokke-Heist, Belgium

Last updated: August 21, 2025

September in Knokke-Heist, Belgium showcases a delightful transition into autumn, with average temperatures hovering around 16°C (61°F). The month may peak at a warm 30°C (86°F), enticing visitors to enjoy the beautiful seaside. However, with 10 days of precipitation accumulating to 56 mm (2.2 in), a hint of rain can be expected, adding freshness to the coastal air. Humidity levels reach 82%, creating a pleasant yet moist atmosphere. Whether basking in warm sun or experiencing gentle showers, September is a charming time to explore this picturesque Belgian gem.

September Temperature in Knokke-Heist

September in Knokke-Heist, Belgium, marks a delightful transition from the warm summer months to the crisp fall season. As the lingering warmth of summer fades, temperatures range from a mild 7°C (45°F) at night to a pleasant 30°C (86°F) during the day, with an average temperature of 16°C (61°F). This striking balance invites outdoor activities, making it an ideal time to explore the scenic coastal landscapes. The slight drop in temperature from the summer peaks reflects the gradual shift towards autumn, yet the days are still inviting enough for beach strolls or enjoying local cafes. With September's charming weather, Knokke-Heist offers a perfect blend of warmth and freshness, basking in the last rays of summer before the cooler months settle in.

September Weather in Knokke-Heist: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Knokke-Heist, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Knokke-Heist, 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).
JanFebMarAprMayJunJulAugSepOctNovDec414345505663656661554744
Data source: Temperature data for Knokke-Heist generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Knokke-Heist

In September, Knokke-Heist experiences a moderate level of precipitation, with an average of 56 mm (2.2 in) spread over approximately 10 days. This marks a slight decrease from the notable rainfall of August, which saw 74 mm (2.9 in) across 13 days. While September's rainfall is less intense, it signifies a transition toward the wetter months ahead. The arrival of autumn is foreshadowed by an increase in precipitation in the subsequent month, October, which typically witnesses a substantial uptick with 89 mm (3.5 in) expected. This pattern highlights the region's shift from the relatively dry and warm summer months into a season marked by increased wetness and variability in weather conditions.

September Precipitation Trends in Knokke-Heist

The chart displays monthly precipitation patterns in Knokke-Heist, 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 Knokke-Heist, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec6561643954616074568960100
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Knokke-Heist

In September, Knokke-Heist experiences a humidity level of 82%, marking a subtle shift as summer transitions to autumn. This month stands out as humidity levels begin to rise again after reaching a low of 76% in August. While January and February are characterized by notably high humidity, averaging 90%, September's levels suggest a return to milder sensations reminiscent of late spring. Overall, the pattern reveals a cyclical rhythm in the coastal climate, with humidity generally increasing as the year progresses toward winter, where it peaks once again in the final months of the year. This blend of warm and moist air creates an inviting atmosphere for both locals and visitors enjoying the beachside charm as the season wanes.

September Average Humidity in Knokke-Heist

This chart illustrates the average monthly humidity levels in Knokke-Heist, 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 Knokke-Heist 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 Knokke-Heist

As summer wraps up in Knokke-Heist, September brings a moderate UV Index of 5, indicating that while the sun is still shining brightly, precautions are advisable for outdoor activities. With a burn time of 30 minutes, it’s essential to enjoy the outdoors responsibly, especially as we transition from the high indices of July and August. This month serves as a reminder that even as temperatures begin to cool, the need for sun protection remains significant. As the year progresses, the UV Index trends downward, dropping to 3 in October, but September still offers plenty of sunny days to relish. For more detailed insights on UV levels throughout the year, visit Knokke-Heist UV Index.

Maximum UV Index Levels in Knokke-Heist for September

The chart shows the monthly maximum UV Index (UVI) for Knokke-Heist 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 Knokke-Heist typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Knokke-Heist 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 Knokke-Heist

As summer fades into autumn, September in Knokke-Heist continues to bask in a generous 320 hours of sunshine. This delightful transition reflects a captivating trend of diminishing daylight hours compared to the sun-drenched peak of July and June, both boasting over 400 hours. However, September maintains a noticeable brightness, overshadowing the earlier months, with only January’s measly 117 hours and November’s 193 hours lagging behind. As the days grow shorter, the allure of Knokke-Heist remains, offering a last taste of summer warmth before the coolness of October settles in.

Monthly Sunshine Duration in Knokke-Heist: September Highlighted

The September sunshine duration represents the total number of hours Knokke-Heist 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.
JanFebMarAprMayJunJulAugSepOctNovDec117h199h273h351h398h410h415h383h320h241h193h149h
Data source: Knokke-Heist September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Knokke-Heist During September

September in Knokke-Heist offers a moderate chance of sunny weather, with about 36% likelihood of enjoying clear skies. As the summer months come to a close, the chances remain relatively stable compared to the previous few months, such as July and August, both also at 35%. While this is a pleasing prospect for those looking to savor the last warm days of the year, it's essential to note that the sunny potential begins to taper off in the fall, dropping to 31% in October. With its unique charm, September still beckons visitors to embrace the fading warmth before the cooler months set in.

Percentage of Sunny Days in September in Knokke-Heist

The chart illustrates the percentage of sunny days in Knokke-Heist 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 Knokke-Heist experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec14%30%38%49%36%35%38%35%36%31%22%15%
Data source: Knokke-Heist September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Knokke-Heist in September

As summer draws to a close in Knokke-Heist, Belgium, September marks a transitional period with daylight lasting approximately 12 hours. This is a gentle decline from the sun-drenched days of June and July, which boast the longest daylight of the year at 16 hours. Following the vibrant month of August, where the days slowly start to shorten, September offers a balance of light as it ushers in the cooler autumn months. The trend of decreasing daylight becomes more pronounced as we move towards October, which sees daylight drop to 10 hours. Overall, September serves as a reminder of nature's rhythms, providing just enough sunlight to enjoy the lingering warmth before the shorter days of fall set in.

Average Daylight Hours in Knokke-Heist for September

The chart illustrates the variation in daylight duration in Knokke-Heist throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 26m9h 59m11h 55m13h 53m15h 36m16h 29m16h 1m14h 28m12h 34m10h 37m8h 52m7h 56m
Data source: Knokke-Heist daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Knokke-Heist

In September, Knokke-Heist experiences a gentle breeze, with average wind speeds dipping to 3.8 m/s (8 mph). This marks a noticeable decline from the summer months, where winds hover above 4 m/s, providing a calmer atmosphere as autumn approaches. The trend reveals a gradual decrease in wind strength from the peak of summer's 4.5 m/s in August to the softer whispers of September. Interestingly, this tranquility is soon followed by a resurgence, as October brings the winds back to 5.3 m/s. As the landscape shifts and the leaves begin to change, the softer winds of September create a serene backdrop, inviting visitors to bask in the last warm days of the year.

Average September Wind Speed in Knokke-Heist

The chart displays monthly wind speed patterns in Knokke-Heist, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.15.34.94.74.83.54.14.53.8 m/s5.34.35.1
Data source: Knokke-Heist September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Knokke-Heist Compares to Other Months

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

September and January present starkly contrasting weather patterns. In September, temperatures range from a mild 7°C (45°F) at night to a warm 30°C (86°F) during the day, with an average of 16°C (61°F). The month experiences about 56 mm (2.2 in) of precipitation over roughly 10 days and a humidity of 82%, making it a relatively comfortable time of year. In contrast, January brings much colder conditions, with temperatures dipping as low as -5°C (24°F) at night, peaking at only 14°C (58°F) during the day, and averaging around 5°C (42°F). It experiences slightly more precipitation at 65 mm (2.5 in) over approximately 12 days, accompanied by higher humidity levels of 91%. For a more detailed look at what to expect, visit Knokke-Heist weather in January.

September and February present contrasting weather patterns. In September, temperatures range significantly from a brisk minimum of 7°C (45°F) to a warm maximum of 30°C (86°F), with an average of 16°C (61°F). The month sees around 56 mm (2.2 in) of precipitation over approximately 10 days, accompanied by a humidity level of 82%. In stark contrast, February is characterized by much colder conditions, with temperatures hitting lows of -6°C (21°F) and an average of only 6°C (43°F), peaking at 17°C (64°F). This month also experiences a slight increase in precipitation, totaling 61 mm (2.4 in) over about 13 days, and a higher humidity level of 89%. For a detailed view of weather specifics, you can check Knokke-Heist weather in February.

September and March present quite contrasting weather conditions. In September, temperatures range from a mild 7°C (45°F) at night to a warm 30°C (86°F) during the day, with an average of 16°C (61°F). The month typically experiences 56 mm (2.2 in) of precipitation over about 10 days and maintains a humidity level of 82%. In contrast, March features chillier temperatures, with nighttime lows of -6°C (21°F) and daytime highs reaching only 21°C (70°F), resulting in an average of 7°C (46°F). This month sees slightly higher precipitation at 64 mm (2.5 in) over about 14 days, along with a humidity level of 87%. For more detailed information, check out Knokke-Heist weather in March.

When comparing the weather in September and April, notable contrasts emerge in temperature and precipitation. September sees a wider temperature range, with minimums around 7°C (45°F) and maximums peaking at 30°C (86°F), while the average hovers at 16°C (61°F). In contrast, April experiences cooler temperatures, ranging from a minimum of 0°C (32°F) to a maximum of 25°C (77°F), with an average of only 10°C (50°F). In terms of precipitation, September has a higher total of 56 mm (2.2 in) spread over 10 days, while April receives 39 mm (1.5 in) across 8 days. Interestingly, humidity levels are quite similar, sitting at 82% in September and 85% in April. For more detailed insights into April weather, please visit Knokke-Heist weather in April.

When comparing the weather in September and May, September tends to be warmer overall, with average temperatures reaching 16°C (61°F) compared to May's 13°C (56°F). September's maximum temperature can climb as high as 30°C (86°F), while May's peak reaches 28°C (83°F). Both months have similar humidity levels at 82%, but September experiences slightly more precipitation, with 56 mm (2.2 in) over 10 days, compared to May's 54 mm (2.1 in) over 12 days. For those looking for more details about May's climate, check out Knokke-Heist weather in May.

In comparing the weather of September and June, we observe that both months have similar temperature ranges, with June averaging slightly warmer at 17°C (63°F) compared to September's 16°C (61°F). The maximum temperatures in both months are also quite close, peaking at 31°C (89°F) in June and 30°C (86°F) in September. Precipitation levels are relatively comparable, with June experiencing 61 mm (2.4 in) over 9 days and September receiving 56 mm (2.2 in) across 10 days. Notably, humidity remains constant at 82% in both months, adding to the overall comfort level of the climate. For additional details, you can explore Knokke-Heist weather in June.

In comparing the weather of September and July, September generally presents milder temperatures, with a minimum of 7°C (45°F) and an average of 16°C (61°F), whereas July experiences warmer conditions, starting at a minimum of 10°C (50°F) and reaching average highs of 18°C (66°F). The maximum temperature in July can soar to 38°C (100°F), significantly higher than September's peak of 30°C (86°F). While both months have similar levels of precipitation, with July receiving 60 mm (2.4 in) over 11 days and September receiving 56 mm (2.2 in) across 10 days, September has a slightly higher humidity level at 82%, compared to July's 80%. For a more detailed overview of July’s weather, you can refer to Knokke-Heist weather in July.

In comparing the weather between August and September, we see notable shifts in temperature and precipitation patterns. September experiences a broader temperature range, with minimums of 7°C (45°F) and maximums reaching up to 30°C (86°F), while the average temperature settles at 16°C (61°F). In contrast, August tends to be warmer, with minimum temperatures at 11°C (52°F), maximums up to 34°C (93°F), and an average of 19°C (66°F). Precipitation is also more frequent in August, totaling 74 mm (2.9 in) over 13 days compared to September's 56 mm (2.2 in) over 10 days. Notably, September has a higher humidity level at 82%, while August is relatively drier at 76%. For more details on the August weather in this region, you can visit Knokke-Heist weather in August.

September and October present a distinct transition in weather patterns. In September, temperatures range from a minimum of 7°C (45°F) to a maximum of 30°C (86°F), with an average of 16°C (61°F). The month experiences a relatively moderate level of precipitation at 56 mm (2.2 in) over 10 days and maintains a humidity level of 82%. In contrast, October sees a drop in temperatures, with a minimum of 3°C (38°F), an average of 13°C (56°F), and a maximum of 24°C (76°F). It also experiences increased rainfall, totaling 89 mm (3.5 in) over 15 days and a higher humidity of 89%. For more details, you can check Knokke-Heist weather in October.

September and November present quite different weather patterns. In September, temperatures range from a minimum of 7°C (45°F) to a maximum of 30°C (86°F), with an average of 16°C (61°F). The month experiences about 56 mm (2.2 in) of precipitation across approximately 10 days, and humidity levels are around 82%. In contrast, November sees cooler temperatures, with a minimum of 0°C (33°F), an average of 9°C (48°F), and a maximum of 19°C (66°F). Precipitation slightly increases to 60 mm (2.4 in) over around 13 days, coupled with higher humidity at 92%. For more details on the weather during this month, you can check Knokke-Heist weather in November.

In September, the weather tends to be warmer with a minimum temperature of 7°C (45°F) and an average of 16°C (61°F), peaking at 30°C (86°F) on the hottest days. It experiences moderate precipitation of 56 mm (2.2 in) over about 10 days, coupled with a humidity level of 82%. In contrast, December brings a significant drop in temperatures, with a minimum of -2°C (29°F) and an average of 7°C (44°F), reaching a maximum of only 14°C (57°F). Additionally, December is wetter, with total precipitation of 100 mm (3.9 in) across 17 days and higher humidity at 92%. For more information, you can check out the detailed climate specifics here: Knokke-Heist weather in December.

Compare Knokke-Heist's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Knokke-Heist

As summer gently transitions into autumn, September in Knokke-Heist showcases a unique blend of lingering warmth and the crispness of the approaching season. With temperatures peaking near 30°C, the month offers a delightful contrast to the cooler days that follow. Although humidity remains high at 82%, the occasional rain—averaging about 56 mm across ten days—adds a refreshing touch to the scenery. This makes September a particularly enchanting time to experience the beauty of Knokke-Heist as it begins to prepare for fall. For more insights into the climate throughout the year, visit Knokke-Heist Climate.