Last updated: August 27, 2025
In September, Katwijk aan Zee offers a delightful transition into autumn, showcasing a maximum temperature that can reach 27°C (81°F) while maintaining a comfortable average of 16°C (61°F). The coastal town experiences a refreshing change with a minimum of 8°C (46°F) during evenings, perfect for evening strolls. Although the month sees 96 mm (3.8 in) of rainfall spread over 13 days, the lush, vibrant landscapes emerge, accompanied by an 83% humidity that envelops the area, enhancing its unique maritime charm. Visitors can revel in the beauty of the beach and surrounding nature, making it an ideal time for exploration and relaxation.
As September rolls in, Katwijk aan Zee begins to experience a gentle transition from the warmth of summer to the crispness of autumn. With temperatures ranging from a comfortable 8°C (46°F) at night to a pleasant 27°C (81°F) during the day, the month offers a delightful balance that invites both locals and visitors to enjoy the sandy shores and vibrant sunsets. The average temperature settles at 16°C (61°F), striking a harmonious midpoint that showcases the waning warmth of summer. As the month progresses, the cooler evenings hint at the approaching fall, making September an ideal time for leisurely beach strolls and cozy gatherings by the sea.
September in Katwijk aan Zee marks a noticeable peak in precipitation, with 96 mm (3.8 in) of rain falling over 13 days. This trend showcases a transition into the wetter months, as September's rainfall is only slightly below August's 95 mm (3.7 in) but sets the stage for the even more substantial downpours to come in October, which averages 120 mm (4.7 in). The consistent increase in precipitation from the summer months into early autumn suggests that residents and visitors should prepare for frequent rain as the season shifts. In this seaside town, the shift into fall is characterized by a blend of lingering warmth and increasing rain, creating a beautifully dynamic landscape.
As summer fades into autumn, September in Katwijk aan Zee experiences a slight uptick in humidity, settling at 83%. This marks a noticeable shift from the drier months of July and August, where humidity levels dipped to their lowest at 80% and 78%, respectively. Although September’s humidity is higher than the preceding months, it still remains significantly lower than the winter months of January and February, both peaking at 87%. The gradual increase in moisture levels reflects the transition towards the more humid seasons, setting the stage for the brisk, refreshing air of fall while maintaining a comfortable ambiance that often characterizes the coastal atmosphere.
As September rolls into Katwijk aan Zee, the UV Index slightly declines from the peak summer months, settling at a moderate UV Index of 5. This means that while the sun is still bright, sun exposure comes with a bit more safety—a welcome shift after the intense very high levels of July and June. With a burn time of 30 minutes, it's essential to stay mindful, especially during midday hours. This month primes the transition into autumn, offering more comfortable outdoor conditions without the extremes of summer. For further details about UV levels throughout the year, check the Katwijk aan Zee UV Index.
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As September arrives in Katwijk aan Zee, the lingering warmth of summer can still be felt, with 331 hours of sunshine illuminating the coastline. This month stands as a gentle transition from the vibrant brightness of July and August, which boast the peak sunshine hours of 431 and 402 respectively. As autumn approaches, the sunlight begins to wane, reflected in the decline from the peak summer months but still delivering a pleasant glow that suggests lingering summer vibes. The gradual decrease in daylight hours, dropping to 245 in October and culminates in the dimmer winter months, encourages locals and visitors alike to relish every sun-drenched moment before the seasons shift. The evolving rhythm of sunlight through the year highlights the unique charm of Katwijk aan Zee, offering a picturesque backdrop for those seeking to bask in the remnants of summer.
In September, Katwijk aan Zee experiences a moderate 32% chance of sunny weather, marking a slight dip from the summer months of June, July, and August. This month serves as a transition into autumn, where the sunshine likelihood begins to wane compared to the peak summer season. Although the probability of clear skies decreases, September still offers a respectable chance for sunny days, making it a pleasant time to enjoy the beach before the colder months set in. As the year progresses, the chances of sunshine continue to decline, with October dipping to 28% and winter months hovering around 18%, emphasizing the fleeting warmth of early autumn in this charming coastal town.
As summer wanes in Katwijk aan Zee, September brings a gentle transition with 12 hours of daylight, marking a gradual decline from the sun-soaked days of July and August. This month showcases the dynamic shift in daylight hours, reminiscent of spring’s awakening in March with 11 hours, and reaching a peak in June with an impressive 16 hours. The fading brightness serves as a poignant reminder of the seasonal cycles, as daylight hours will continue to diminish, leading us into the cozy embrace of autumn. The balance of 12 hours in September strikes a harmonious note between the lingering warmth of summer and the approaching chill of fall, inviting residents and visitors alike to savor the remaining sunlit moments before the darker months set in.
As September unfolds in Katwijk aan Zee, the average wind speed settles at a gentle 4.3 m/s (10 mph), marking a notable decrease from the brisk gusts of summer. Following the peak winds of January and February at 5.9 m/s (13 mph), the trend throughout the warmer months reveals a gradual reduction. August, with its 5.4 m/s (12 mph) winds, signals a transition as the coastal breezes mellow, making way for the more serene feel of autumn. This calming wind character in September serves as a gentle reminder of the changing seasons, paving the way for the slightly more invigorating winds of October, which rebound to 6.3 m/s (14 mph). Such fluctuations not only enhance the coastal charm of Katwijk aan Zee but also contribute to the dynamic coastal ecosystem that thrives here.
Weather in Katwijk aan Zee varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Katwijk aan Zee, focusing on differences in temperature, rainfall, humidity, and UV levels.
September weather is generally milder and more pleasant, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 27°C (81°F) and an average of 16°C (61°F). During this month, Katwijk experiences approximately 96 mm (3.8 in) of precipitation over 13 days, with humidity levels averaging around 83%. In contrast, January brings much colder temperatures, with a minimum of -4°C (25°F) and a maximum of 13°C (55°F), resulting in an average of just 5°C (42°F). Although January has slightly less precipitation at 66 mm (2.6 in) over 14 days, the humidity remains high at 87%, contributing to the chilly atmosphere of late winter. For a detailed look at January weather, visit Katwijk aan Zee weather in January.
September and February present contrasting weather patterns. In September, temperatures range from a mild 8°C (46°F) at their lowest to a warm 27°C (81°F) at their peak, with an average of 16°C (61°F), making it a pleasant month for outdoor activities. However, it sees considerable rainfall, totaling 96 mm (3.8 in) over 13 days, combined with high humidity at 83%. In contrast, February is much colder, with temperatures dipping as low as -8°C (19°F) and averaging just 5°C (42°F). Although it reaches a maximum of 16°C (60°F), the overall chill is much more pronounced. This month also experiences less rainfall, at 72 mm (2.8 in) over the same number of days, though humidity is slightly higher at 87%. For more details about February weather in the area, you can visit Katwijk aan Zee weather in February.
September and March present contrasting weather conditions. September offers milder temperatures, with a minimum of 8°C (46°F) and an average of 16°C (61°F), peaking at 27°C (81°F). This month experiences more rainfall, totaling 96 mm (3.8 in) across 13 days, accompanied by high humidity levels of 83%. In contrast, March is significantly cooler, with temperatures ranging from a minimum of -7°C (20°F) to an average of 7°C (44°F), and a maximum of 18°C (65°F). Despite being slightly drier with 71 mm (2.8 in) over 14 days, the humidity is still high at 86%. For more detailed information, you can refer to Katwijk aan Zee weather in March.
When comparing the weather in September and April, there are notable differences in temperature and precipitation. September boasts a wider temperature range, with a minimum of 8°C (46°F), an average of 16°C (61°F), and a maximum of 27°C (81°F), while April is cooler, experiencing a minimum of 1°C (35°F), an average of 9°C (49°F), and a maximum of 24°C (75°F). In terms of precipitation, September sees more rainfall, totaling 96 mm (3.8 in) over 13 days, compared to April's 43 mm (1.7 in) over just 9 days. Both months maintain similar humidity levels, with September at 83% and April slightly lower at 85%. For more detailed insights into April weather, you can visit Katwijk aan Zee weather in April.
In September, the weather tends to be warmer than in May, with average temperatures reaching 16°C (61°F) compared to May's 13°C (55°F), although both months share a maximum temperature of 27°C (81°F). However, September experiences more rainfall, with 96 mm (3.8 in) over 13 days, while May sees only 58 mm (2.3 in) across 11 days. Both months have high humidity levels, but September's humidity at 83% is slightly lower than May's at 84%. For more detailed information on the weather during May, you can check out Katwijk aan Zee weather in May.
When comparing the weather in September and June, there are notable differences in temperature and precipitation levels. September typically sees a minimum temperature of 8°C (46°F) and an average of 16°C (61°F), with maximum temperatures reaching up to 27°C (81°F). The month experiences higher precipitation, totaling 96 mm (3.8 in) over approximately 13 days, leading to a humidity level of 83%. In contrast, June has slightly warmer temperatures, with a minimum of 9°C (49°F) and an average of 17°C (62°F), peaking at 29°C (84°F). June's rainfall is lower, at around 70 mm (2.8 in) across 10 days, and the humidity is slightly less at 81%. For a detailed look at the weather in June, you can visit Katwijk aan Zee weather in June.
In comparison to July, September experiences cooler temperatures, with minimums dipping to 8°C (46°F) and an average of 16°C (61°F) compared to July's minimum of 11°C (52°F) and an average of 18°C (65°F). While July boasts maximum highs of 33°C (92°F), September sees a more moderate high of 27°C (81°F). Additionally, September is wetter, with 96 mm (3.8 in) of precipitation over 13 days, compared to July's 68 mm (2.7 in) of rainfall over the same number of days. Humidity remains relatively high in both months, at 83% in September and 80% in July. For more details on July weather patterns, check out Katwijk aan Zee weather in July.
In comparing September and August weather, September experiences cooler temperatures with a minimum of 8°C (46°F) and an average of 16°C (61°F), while August is warmer, featuring a minimum of 12°C (53°F) and an average of 19°C (66°F). The maximum temperatures also reflect this trend, with September peaking at 27°C (81°F) compared to August’s higher maximum of 30°C (86°F). Precipitation levels are similar, with September receiving 96 mm (3.8 in) over 13 days and August slightly less at 95 mm (3.7 in) over 15 days. Interestingly, September has higher humidity at 83%, compared to 78% in August, making it feel a bit muggier as summer transitions to fall. For more details on August weather specifically, you can explore Katwijk aan Zee weather in August.
September offers a warm transition into autumn, with average temperatures reaching up to 27°C (81°F) and a relatively low precipitation rate compared to October, where rainfall increases to 120 mm (4.7 in) over 17 days. In contrast, October sees a notable drop in temperature, with highs averaging around 23°C (74°F) and lows sinking to 4°C (39°F). Humidity also rises slightly from 83% in September to 86% in October, highlighting the shift towards cooler, wetter conditions. For more detailed insights, check out Katwijk aan Zee weather in October.
September generally offers warmer temperatures compared to November, with minimums averaging 8°C (46°F) and maximums reaching 27°C (81°F), making it a pleasant time of year. In contrast, November experiences cooler conditions, with average minimum temperatures dropping to 1°C (33°F) and maximums around 17°C (63°F). While September records higher precipitation levels at 96 mm (3.8 in) over 13 days, November sees slightly less rain at 70 mm (2.8 in) but spreads it over 15 days, increasing the likelihood of more overcast and damp days. Humidity also rises from September's 83% to November's 87%, contributing to a chillier atmosphere. For a detailed look at local weather conditions during this period, check out the Katwijk aan Zee weather in November.
September typically experiences milder temperatures, with averages around 16°C (61°F) and maximums reaching up to 27°C (81°F), making it a pleasant month for outdoor activities. In contrast, December brings significantly cooler weather, with average temperatures dropping to 6°C (44°F) and highs only reaching 13°C (55°F). Both months see considerable precipitation, but September has slightly less at 96 mm (3.8 in) over 13 days compared to December's 110 mm (4.3 in) over 18 days, suggesting a wetter atmosphere as the year closes. Additionally, humidity levels increase marginally from 83% in September to 86% in December, contributing to the chilly feel of the winter month. For more detailed weather information, you can visit Katwijk aan Zee weather in December.
September in Katwijk aan Zee marks a distinctive transition into autumn, featuring a blend of warm days and cooler nights. With highs that can reach up to 27°C (81°F), early September still holds onto the remnants of summer, but averages tend to shift to a milder 16°C (61°F), signaling a change in the season. This month also experiences frequent rain, with 96 mm (3.8 in) of precipitation spread across 13 days, making it notably wetter than the sunnier summer months. The air carries a typical humidity level of 83%, contributing to that crisp, refreshing feel as nature begins its transformation. For a deeper look at the weather patterns in this region, check out Katwijk aan Zee Climate.