Last updated: October 31, 2025
In December, Koolbaai, Sint Maarten, enjoys a tropical climate characterized by average temperatures hovering around 26°C (79°F). Visitors can expect warm days with a maximum of 28°C (82°F) and cooler nights, dipping to a minimum of 24°C (75°F). The month sees 48 mm (1.9 in) of rainfall spread over 16 days, contributing to an overall humidity level of 78%. This combination of warm weather and occasional showers creates a lush environment, making it an ideal time for travelers seeking both relaxation and tropical beauty.
In December, Koolbaai, Sint Maarten, welcomes the festive season with pleasant temperatures that appeal to both locals and visitors alike. The month typically sees a minimum of 24°C (75°F) and an average of 26°C (79°F), rising to a comfortable maximum of 28°C (82°F). This transitional period into winter showcases a slight increase in warmth compared to November, where the temperatures hovered around similar averages. As the year winds down, Koolbaai's climate remains inviting, making it an ideal time to bask in the island's beauty and partake in outdoor festivities. With steady warmth throughout the month, December stands out as a perfect blend of comfort and tropical charm.
In Koolbaai, Sint Maarten, December brings a notable shift in precipitation patterns as the year draws to a close. With an average rainfall of 48 mm (1.9 in), December sees a decrease from the heavy showers experienced in September (161 mm) and October (113 mm). Over 16 rainy days, residents and visitors alike experience a mix of sunshine and scattered showers, typical of the region's tropical climate. This trend reflects a transition towards drier conditions following the peak of the rainy season, making December a perfect time to enjoy the island's beauty while still being prepared for the occasional downpour. As the year wraps up, the weather facilitates both relaxation and exploration, embodying the vibrant spirit of Sint Maarten.
In Koolbaai, Sint Maarten, December ushers in a slight dip in humidity, settling at 78% after a peak in the summer months. The year begins with a steady rhythm of 77% humidity from January through March, showcasing a moderate and comfortable climate. As spring transitions into summer, moisture levels rise, reaching their highest at 83% in July, before gradually tapering off towards the year's end. Interestingly, this trend reflects a typical tropical pattern, where humidity builds with the heat, peaking during the hotter months and retreating just slightly as winter approaches. Thus, December's humidity continues a trend of mildness, creating an inviting atmosphere for those looking to escape the chill of winter elsewhere.
In Koolbaai, Sint Maarten, the UV Index experiences notable fluctuations throughout the year, particularly peaking during the warmer months. January and December both showcase a UV Index of 9, categorized as very high, with a burn time of 15 minutes. As spring approaches, the index rises to an extreme level of 11 in February and reaches a sharp peak of 13 from March through June. The trend continues, with September recording the highest index at 14, before tapering back down to 12 in October and returning to similar levels as the start of the year in November. This consistent pattern of extreme exposure in the summer months signals the necessity of sun protection during that time, especially as the burn time narrows to just 10 minutes. For more detailed information on monthly variations, check out Koolbaai UV Index.
UV Risk Categories
As December arrives in Koolbaai, Sint Maarten, the sun continues to shine brightly, contributing to a captivating tropical ambiance. With 323 hours of sunshine, this month offers a warm invitation for travelers seeking a winter escape. Following the pattern of the previous months, December maintains a solid level of sunshine, coming closely off the heels of November's 308 hours. Interestingly, the sunshine hours have shown a general trend of increase from the early months of the year, peaking in May at 363 hours before gently tapering off in late summer. This trend highlights a vibrant sun-soaked journey through the year, making Koolbaai a delightful spot for those looking to bask in the warmth of the Caribbean sun, even as winter sets in elsewhere.
In December, Koolbaai, Sint Maarten enjoys a promising likelihood of sunny weather, boasting a 66% chance of sunshine. This figure is part of a generally positive trend seen in the fall months, where the likelihood remains consistently high, culminating in November's peak at 67%. As the year closes out, December's sun chances are slightly lower than those of the preceding November but show a marked improvement over the summer months, notably June's low of 25%. With the winter solstice on the horizon, sun-seekers can expect pleasant conditions, making it an ideal time for outdoor activities and soaking up the sun’s warm rays.
In Koolbaai, Sint Maarten, the daylight duration undergoes subtle shifts throughout the year, culminating in consistent patterns. December, like its predecessor November, enjoys about 11 hours of daylight, maintaining the shorter days characteristic of the late autumn and early winter months. As the year unfolds, daylight begins at a steady 11 hours in January and February, before gradually increasing to 12 hours in the spring months of March through May. The summer months bring the longest days, peaking at 13 hours in June and July, providing ample sunshine for outdoor activities. As summer fades into autumn, daylight durations taper back to 12 hours in August and September, before returning to 11 hours as the year draws to a close. This cyclical pattern highlights the island’s tropical climate, where daylight remains fairly constant yet offers distinct shifts throughout the seasons.
As December settles in Koolbaai, Sint Maarten, the island experiences a refreshing average wind speed of 8.1 m/s (18 mph), signaling a delightful end to the year. This increase from November's more tranquil conditions continues a trend of elevating winds through the latter part of the year, with December's breezy allure surpassing earlier months like October and September, which saw notably calmer days. While January begins with more moderate winds, December stands out, reminiscent of summer's vibrant gusts observed in July and June. The consistent trade winds provide a perfect backdrop for sun-soaked adventures and serene beach days, wrapping up the year with a spirited breeze that enhances the island's charm.
Weather in Koolbaai varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Koolbaai, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January weather exhibit some subtle differences. In December, temperatures typically range from a minimum of 24°C (75°F) to a maximum of 28°C (82°F), with an average temperature of 26°C (79°F). The month sees about 48 mm (1.9 in) of precipitation over approximately 16 days, accompanied by a humidity level of 78%. In contrast, January experiences slightly cooler temperatures, with a minimum of 23°C (74°F) and a maximum of 27°C (81°F), resulting in an average of 25°C (78°F). Precipitation decreases to 35 mm (1.4 in) over about 14 days, and humidity slightly drops to 77%. For a detailed overview of the climate conditions, check out Koolbaai weather in January.
In December, the weather tends to be slightly warmer, with average temperatures ranging from a minimum of 24°C (75°F) to a maximum of 28°C (82°F). It also experiences higher precipitation, totaling 48 mm (1.9 in) over 16 days, along with a humidity of 78%. In contrast, February brings a bit cooler temperatures, with averages between 22°C (72°F) and 26°C (80°F). Additionally, there is less rainfall, with only 35 mm (1.4 in) over 11 days and a slightly lower humidity of 77%. For more detailed insights, you can explore the Koolbaai weather in February.
December and March exhibit a generally warm climate, though December tends to be slightly warmer with average temperatures ranging from 24°C (75°F) to 28°C (82°F), compared to March's milder range of 22°C (73°F) to 26°C (79°F). Precipitation is more frequent in December, with 48 mm (1.9 in) occurring over 16 days, while March experiences less rain, totaling 27 mm (1.1 in) across just 10 days. Humidity levels remain similar in both months, with December at 78% and March slightly lower at 77%. For a more detailed look at March weather, visit Koolbaai weather in March.
When comparing December and April weather, both months exhibit warm temperatures, with December slightly warmer. In December, the minimum temperature averages 24°C (75°F) and peaks at 28°C (82°F), while April sees a minimum of 23°C (74°F) with a maximum of 27°C (81°F). Precipitation levels are also higher in December, with 48 mm (1.9 in) spread over 16 days, compared to April's 35 mm (1.4 in) over just 11 days. Interestingly, both months maintain a consistent humidity level of 78%. For more details on April's weather, you can visit Koolbaai weather in April.
In December, the weather features a warm average temperature of 26°C (79°F) with a minimum of 24°C (75°F) and a maximum of 28°C (82°F). The month experiences relatively high humidity at 78% and has 48 mm (1.9 in) of precipitation spread over 16 days. In contrast, May offers a similar warm climate with the same average and maximum temperatures, but a slightly lower minimum temperature of 23°C (74°F). Although May records a similar amount of precipitation at 49 mm (1.9 in), it occurs over just 11 days, leading to a slightly more dry and sunny feel with 79% humidity. For more detail on May's climate, visit Koolbaai weather in May.
In December, temperatures range from a minimum of 24°C (75°F) to a maximum of 28°C (82°F), with an average of 26°C (79°F). The month sees about 48 mm (1.9 in) of rainfall over 16 days, accompanied by a humidity level of 78%. In contrast, June experiences slightly warmer temperatures, with a minimum of 25°C (76°F) and a maximum of 28°C (83°F), averaging 27°C (81°F). Although June has a comparable amount of precipitation at 50 mm (2.0 in), it has fewer rainy days—14 in total—and a slightly higher humidity level of 81%. For more detailed information about the weather in June, you can check out Koolbaai weather in June.
In December, the weather in Koolbaai is warm and pleasant, with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 28°C (82°F), accompanied by an average of 26°C (79°F). The month sees approximately 48 mm (1.9 in) of precipitation over 16 days, with humidity levels around 78%. In contrast, July experiences slightly higher temperatures, with a minimum of 25°C (77°F) and a maximum of 29°C (84°F), resulting in an average of 27°C (81°F). July also brings more rainfall, totaling 83 mm (3.3 in) over 17 days, along with increased humidity at 83%. For more details on July weather, you can check out Koolbaai weather in July.
In December, the weather in Koolbaai is marked by warm temperatures, with minimums around 24°C (75°F) and averages of 26°C (79°F), peaking at 28°C (82°F). Precipitation is relatively low for the month, totaling 48 mm (1.9 in) over about 16 days, with humidity levels at 78%. In contrast, August experiences slightly higher temperatures, featuring minimums of 25°C (78°F) and averaging 28°C (82°F), with a maximum of 29°C (84°F). August also sees increased rainfall, with 87 mm (3.4 in) of precipitation over the same 16 days, accompanied by higher humidity at 82%. For more detailed information, you can check Koolbaai weather in August.
When comparing the weather in December and September, it’s evident that December is slightly cooler and drier. In December, temperatures range from a minimum of 24°C (75°F) to a maximum of 28°C (82°F) with an average of 26°C (79°F). The month experiences about 48 mm (1.9 in) of precipitation over 16 days, with humidity at 78%. Conversely, September tends to be warmer, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F) and an average of 28°C (82°F). It also sees significantly more rainfall, totaling 161 mm (6.3 in) spread across 22 days, coupled with a slightly higher humidity of 80%. For more detailed information, you can visit Koolbaai weather in September.
When comparing the weather in December and October, October tends to be slightly warmer, with average temperatures reaching up to 27°C (81°F) and highs of 29°C (84°F). In contrast, December experiences a slight drop, averaging 26°C (79°F) with a maximum of 28°C (82°F). Precipitation levels also differ significantly, as October receives 113 mm (4.5 in) over 18 days, while December has only 48 mm (1.9 in) spread over 16 days. Humidity remains relatively consistent between the two months, averaging 78% in December and 79% in October. For more details on October weather, check out Koolbaai weather in October.
In comparing the weather patterns of December and November, both months maintain warm temperatures, with December averaging slightly lower at 26°C (79°F) compared to November's 27°C (80°F). While December features a consistent climate with a maximum of 28°C (82°F), it experiences less rainfall, receiving only 48 mm (1.9 in) over 16 days, as opposed to November's higher precipitation of 96 mm (3.8 in) across 17 days. Humidity remains quite similar, with December at 78% and November at 79%, ensuring that both months feel tropical. For a closer look at November's climate, you can refer to Koolbaai weather in November.
As December rolls in, Koolbaai experiences a delightful shift in weather, offering a warm embrace with average temperatures hovering around 26°C (79°F). This month stands out with a mix of moderate rainfall—spreading across 16 days—which can bring refreshing breaks to the balmy atmosphere. Unlike the hotter summer months, December introduces a touch of humidity, lingering at around 78%, making the air feel cozy yet comfortable. If you’re looking for a blend of warmth and occasional sprinkles, December is a wonderful time to enjoy Koolbaai's charm. For more details on what to expect, check out Koolbaai Climate!