Last updated: October 30, 2025
September in Willemstad, Curaçao offers a tropical haven characterized by warm temperatures and moderate rainfall. The average temperature hovers around 28°C (83°F), with daily highs reaching up to 30°C (87°F) and lows around 26°C (78°F). This month experiences 54 mm (2.1 in) of rainfall spread over 12 days, contributing to a relative humidity of 69%. Visitors can expect a mix of sunshine and occasional showers, creating a lush, vibrant atmosphere perfect for exploring this Caribbean gem.
In September, temperatures in Willemstad, Curaçao continue the island's trend of warm, tropical weather, with minimums reaching 26°C (78°F) and averages climbing to a balmy 28°C (83°F). As the month progresses, residents and visitors can expect maximums to peak at an inviting 30°C (87°F), mirroring the warmth of August. This gradual increase in temperature highlights a consistent pattern of warmth as summer transitions into fall, making September an ideal time for beach outings, water sports, and exploring the vibrant local culture amidst blissful sunshine. The overall climate remains pleasantly warm, ensuring that the tropical charm of Curaçao continues to captivate all who visit.
September marks a notable transition in Willemstad, Curaçao, as the island experiences a slight uptick in precipitation. With 54 mm (2.1 in) of rain falling over 12 days, it’s a month that bridges the drier summer season and the wetter autumn ahead. While rainfall is modest compared to the heavy downpours of October and November, September’s totals closely mirror the preceding month of August, which also saw 53 mm (2.1 in). This consistent rainfall trend hints at the onset of a more humid environment, helping to rejuvenate the landscape after the heat of summer. As the year progresses, it’s clear that September serves as a pivotal month in the rainfall pattern, setting the stage for the significantly wetter months to follow.
In September, Willemstad, Curaçao experiences a comfortable humidity level of 69%, consistent with most of the earlier months of the year. This stable figure reflects the island's tropical climate, where humidity tends to hover around similar values. Notably, from June to August, humidity levels rise significantly, peaking at 79% in July. However, as autumn approaches, September sees a return to that familiar mid-range of humidity, aligning with the yearly average and providing a pleasant atmosphere for residents and visitors alike. This trend of relatively constant humidity underscores the tropical environment, making Willemstad a scenic and enjoyable destination throughout the year.
In September, Willemstad experiences a consistent UV Index of 13, categorized as extreme, reflecting a year-long trend of high sun exposure that residents and visitors should take seriously. This level of UV radiation, typical for the months leading into the heart of summer, maintains the same cautionary burn time of just 10 minutes. As the year progresses from January's peak index of 14 during the spring months, the UV levels gradually stabilize around the high teens through summer, making it crucial to stay protected. For more details on the UV index throughout the year, visit Willemstad UV Index.
UV Risk Categories
As summer makes its graceful exit, September in Willemstad, Curaçao offers a delightful blend of warmth and sunshine. With an impressive 337 hours of sun, this month showcases a slight dip from the vibrant light of July and August, yet still shines brighter than the earlier months of the year. This trend of consistently high sunshine hours reflects the island's enticing tropical climate, where sunshine becomes a cherished companion. As the rainy season approaches, September remains a perfect time to bask in the sun, enjoy the stunning coastal views, and immerse yourself in the vibrant culture of this Caribbean gem.
In September, visitors to Willemstad, Curaçao can expect a moderate chance of sunny weather, with approximately 44% of the days featuring bright sunshine. This percentage aligns closely with the trend seen in the preceding months of August and July, where the chances are slightly higher at 47% and 52%, respectively. As summer transitions into fall, the likelihood of sun begins to taper off, reflecting a shift that continues into October, which has a 38% chance. Overall, while September maintains a reasonable opportunity for sunny days, travelers might want to be prepared for the possibility of more overcast conditions as the month progresses.
In September, Willemstad, Curaçao enjoys a delightful 12 hours of daylight, continuing the trend established over the summer months. This consistent daylight duration is a hallmark of the island’s tropical climate, offering plenty of sunshine for outdoor activities and exploration. As the year progresses into October, daylight will gradually decrease to 11 hours, marking the return to shorter days typical of the autumn season. Overall, the steady pattern of daylight across the months highlights the region's appealing climate, inviting residents and visitors alike to bask in the abundant sunshine year-round.
As summer transitions to fall, September in Willemstad, Curaçao, experiences a gentle lull in wind speed, averaging at 7.9 m/s (18 mph). This marks a notable dip from the more breezy months of late spring and early summer, where winds frequently reached around 9.3 m/s (21 mph). The slightly calmer September breeze offers a refreshing change, providing a tranquil atmosphere ideal for enjoying the island's stunning beaches and vibrant outdoor activities. Following this month, wind speeds gradually rebound, hinting at a dynamic seasonal shift. Overall, September's breezes maintain a delightful balance, inviting both relaxation and adventure under the Caribbean sun.
Weather in Willemstad varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Willemstad, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between September and January, we see notable differences in temperature and precipitation. September tends to be warmer, with minimum temperatures around 26°C (78°F) and an average of 28°C (83°F), peaking at 30°C (87°F). In contrast, January's temperatures are slightly cooler, with a minimum of 23°C (75°F), an average of 26°C (79°F), and a maximum of 27°C (82°F). While both months experience similar humidity levels at 69%, September sees slightly higher precipitation at 54 mm (2.1 in) over 12 days, compared to January's 50 mm (2.0 in) over 14 days. For a more detailed look at the climate in January, visit Willemstad weather in January.
In September, the weather is typically warmer, with average temperatures ranging from a minimum of 26°C (78°F) to a maximum of 30°C (87°F), while February's temperatures are a bit cooler, averaging between 23°C (74°F) and 27°C (81°F). September also sees higher precipitation levels, with 54 mm (2.1 in) over approximately 12 rainy days, compared to February's 39 mm (1.5 in) spread across 13 days. Both months experience similar humidity levels at 69%, but September tends to be more humid overall due to its higher temperatures. For a detailed look at February's weather, check out Willemstad weather in February.
In comparing the weather of September and March, September tends to be slightly warmer, with average temperatures ranging from a minimum of 26°C (78°F) to a maximum of 30°C (87°F). In contrast, March is cooler, with an average ranging from 24°C (75°F) to 27°C (81°F). Rainfall is also more frequent in September, with 54 mm (2.1 in) of precipitation over 12 days, compared to March, which sees 33 mm (1.3 in) over 11 days. Both months maintain similar humidity levels at 69%. For more detailed information, you can visit Willemstad weather in March.
When comparing the weather between September and April, September tends to be warmer, with average temperatures ranging from a minimum of 26°C (78°F) to a maximum of 30°C (87°F). In contrast, April features slightly cooler temperatures, averaging between 24°C (76°F) and 27°C (81°F). Additionally, September experiences more rainfall, totaling 54 mm (2.1 in) over approximately 12 days, while April sees significantly less precipitation, with only 22 mm (0.9 in) over about 4 days. Humidity levels are fairly similar, sitting at 69% in September and 68% in April. For a closer look at what to expect, check out Willemstad weather in April.
September typically experiences warmer temperatures than May, with average highs reaching around 30°C (87°F) compared to May’s maximum of 28°C (82°F). Additionally, September sees more precipitation, averaging 54 mm (2.1 in) over approximately 12 days, while May has less, at around 34 mm (1.3 in) over 8 days. Despite these differences, both months share a similar humidity level of 69%, creating a consistently warm and tropical atmosphere. For those interested in detailed weather patterns, you can explore more about Willemstad weather in May.
In comparing the weather of September and June, we observe some notable differences. While both months feature warm temperatures, September is slightly warmer with an average of 28°C (83°F) compared to June's 27°C (81°F). September also experiences higher maximum temperatures, reaching up to 30°C (87°F) versus June's peak of 28°C (82°F). Despite September's warmer temperatures, it has more precipitation, with 54 mm (2.1 in) compared to June's 40 mm (1.6 in), both having rainfall on about 12 days. Additionally, September has a humidity level of 69%, slightly lower than June's 74%. For more detailed insights, you can check out Willemstad weather in June.
In comparison to July, September tends to be slightly warmer, with average temperatures reaching up to 28°C (83°F) compared to July's average of 27°C (81°F). While both months experience high humidity, September's humidity is at 69%, which is a bit lower than July's 79%. Additionally, September has more rainfall, averaging 54 mm (2.1 in) over 12 days, whereas July sees less precipitation at 36 mm (1.4 in) over 10 days. For more details on July weather, you can visit Willemstad weather in July.
In comparing the weather between September and August, we see that both months offer warm temperatures, with September having a minimum of 26°C (78°F) and an average of 28°C (83°F), similar to August's minimum of 25°C (77°F) and its average of 28°C (82°F). The maximum temperatures are nearly identical, reaching 30°C (87°F) in September and 30°C (86°F) in August. While precipitation levels are quite close, September sees a slight increase with 54 mm (2.1 in) over 12 days compared to August’s 53 mm (2.1 in) across 13 days. Humidity tends to be slightly lower in September at 69%, compared to the 73% in August. For more detailed information about the weather in August, please refer to Willemstad weather in August.
September and October weather in Willemstad exhibit some notable similarities and differences. Both months maintain a consistent average temperature of 28°C (83°F), with September slightly warmer, peaking at a maximum of 30°C (87°F) compared to October's maximum of 29°C (85°F). However, October experiences significantly higher precipitation, receiving 111 mm (4.4 in) over 22 days, while September only sees 54 mm (2.1 in) over 12 days. Despite these changes in rainfall, the humidity remains steady at 69% throughout both months. For more detailed information on October weather, you can visit Willemstad weather in October.
September and November exhibit distinctly different weather patterns. In September, temperatures range from a minimum of 26°C (78°F) to a maximum of 30°C (87°F), with an average of 28°C (83°F). The month sees moderate rainfall, totaling 54 mm (2.1 in) over 12 days, accompanied by a humidity level of 69%. Conversely, November experiences slightly cooler temperatures, with a minimum of 25°C (77°F) and a maximum of 29°C (84°F), averaging 27°C (82°F). However, it is wetter, with precipitation reaching 115 mm (4.5 in) over 24 days and a humidity level of 71%. For more detailed information on November weather, check out Willemstad weather in November.
In September, the weather is warm with minimum temperatures around 26°C (78°F) and average highs reaching 30°C (87°F). This month experiences moderate precipitation, totaling 54 mm (2.1 in) over approximately 12 days, coupled with a humidity level of 69%. In contrast, December brings slightly cooler temperatures, with minimums of 24°C (76°F) and maximums of 29°C (84°F), while average temperatures hover around 27°C (80°F). However, December sees increased rainfall, averaging 69 mm (2.7 in) across 22 days, and slightly higher humidity at 70%. For a detailed look at December weather, you can visit Willemstad weather in December.
As September rolls into Willemstad, the weather introduces a harmonious blend of warmth and humidity, often more distinct than in the preceding months. With temperatures averaging around 28°C (83°F), the days are comfortably warm but can feel a tad more humid at 69%. Visitors should prepare for occasional rainfall, as 12 days of drizzle can yield up to 54 mm of precipitation throughout the month. This slight uptick in rain and humidity compared to other months creates a vibrant landscape, making the island lush and inviting. For a closer look at what to expect, check out the detailed insights on Willemstad Climate.