Last updated: August 31, 2025
In December, Castries, Saint Lucia experiences a delightful tropical climate characterized by a maximum temperature of 30°C (86°F) and an average temperature of 26°C (80°F). The minimum temperature hovers around a comfortable 22°C (72°F), making it an inviting destination for visitors. However, travelers should note that December typically sees around 46 mm (1.8 in) of precipitation spread over 16 days, resulting in a humidity level of 82%. This combination of warmth and moisture creates a lush environment, perfect for exploring the vibrant landscapes and rich culture of this Caribbean gem.
In December, Castries, Saint Lucia, enjoys warming temperatures as the island transitions toward its dry season. With a minimum of 22°C (72°F) and an average of 26°C (80°F), the month sets a pleasant backdrop for both locals and visitors alike. The maximum temperature reaches 30°C (86°F), providing ample sunshine and tropical allure. As the year draws to a close, December's weather mirrors the consistent warmth seen throughout the preceding months, making it an ideal time for outdoor activities and soaking up the vibrant island culture. This favorable climate trend paves the way for festive celebrations and holiday cheer amidst the balmy atmosphere.
In December, Castries, Saint Lucia experiences a notable dip in precipitation, recording 46 mm (1.8 in) of rainfall over 16 days. This marks a decrease from the previous months, where heavier rains had dominated, particularly in October and November, with their respective totals of 128 mm (5.1 in) and 103 mm (4.1 in). The transition into December not only reveals a reduction in both the amount and frequency of rainfall, but also hints at the region's gradual shift from its wet season to a relatively drier period. Despite this decrease, December remains considerably wetter than the initial months of the year, reminding visitors and locals alike of the tropical climate's lingering humidity and lush beauty.
In Castries, Saint Lucia, December marks a continuation of the region's generally high humidity levels, averaging 82%. This figure is quite consistent with the preceding months, highlighting a trend of elevated humidity from mid-year through the end of the calendar year. Following a peak in July at 84%, the humidity gradually tapers off yet remains significantly high, with only slight fluctuations observed. The readings in December closely mirror those of October and November, all hovering in the low to mid-80s. This persistent humidity fosters a lush tropical environment, enhancing the rich beauty of the island as it welcomes the festive season.
In December, Castries, Saint Lucia experiences a UV Index of 9, categorizing it as very high and allowing for a burn time of 15 minutes. This marks a slight decrease from the previous months, which consistently showcased extreme UV levels of 12 to 14, demanding caution and short exposure times of just 10 minutes. Such trends illustrate a gradual seasonal transition in UV intensity, making December a relatively safer month for outdoor activities. However, visitors and locals should remain vigilant and protect their skin during those sunlit hours. For more details on UV levels throughout the year, visit Castries UV Index.
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December in Castries, Saint Lucia, offers a delightful transition into the new year with 330 hours of brilliant sunshine, allowing visitors to bask in the island's tropical charm. This month typically sees a generous amount of sunlight, contributing to a consistent pattern of brightness that begins to peak from early in the year. With the sunshine hours steadily increasing from 268 in January to 355 in May, December maintains a favorable position, just slightly below the sunniest months. As the island welcomes winter, the weather remains invitingly warm, showcasing a beautiful balance of sunshine and seasonal comfort, perfect for those looking to escape the chill of northern climates.
In December, Castries, Saint Lucia enjoys a 54% chance of sunny weather, a promising feature that sets the stage for delightful holiday experiences. As the year draws to a close, the likelihood of sunshine remains relatively high, particularly when compared to the lower probabilities observed in the preceding months of April (36%) and June (29%). This slight uptick from November's 58% highlights a trend toward more favorable weather, making December an attractive time for visitors seeking warm, sunlit days to revel in the island's vibrant culture and picturesque landscapes. Travelers can expect to bask in pleasant sun while enjoying the natural beauty and festive spirit of this tropical paradise.
In December, Castries, Saint Lucia, enjoys a consistent daylight duration of 11 hours, mirroring the shorter days of October and November. This pattern suggests a gradual transition as the year winds down, with daylight peaking at 12 hours during the sun-drenched months of March through August. The return to 11 hours in late autumn signals the approach of winter, creating a cozy atmosphere perfect for exploring the island's natural beauty and vibrant culture. As daylight hours shorten, the tranquil evenings invite locals and visitors alike to unwind under the enchanting Caribbean skies.
In December, the winds in Castries, Saint Lucia pick up, reaching an average speed of 6.4 m/s (14 mph), a refreshing breath of air that heralds the end of the year. Notably, this marks a return to the higher wind speeds reminiscent of the early months of the year, such as January and March, which also averaged at 6.3 m/s. Throughout the year, wind patterns reveal a gentle ebb and flow, with the most notable dip occurring in September, where speeds plummet to just 3.9 m/s (9 mph). Overall, December’s breezy conditions create a delightful backdrop for tourists and locals alike, inviting all to enjoy the island’s vibrant atmosphere.
Weather in Castries varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Castries, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January have quite similar weather patterns, with both months featuring minimum temperatures around 22°C (72°F) and maximums reaching 30°C (86°F). While December has a slightly higher average temperature of 26°C (80°F), January follows closely with an average of 26°C (78°F). In terms of precipitation, December experiences a bit more rainfall, with 46 mm (1.8 in) over 16 days compared to January's 36 mm (1.4 in) spread across 15 days. Humidity remains high in both months, with December at 82% and January slightly lower at 81%. For a detailed look at January weather, visit Castries weather in January.
In comparing the weather between December and February, both months exhibit warm temperatures, with December seeing slightly higher averages and maximums. December's temperatures range from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), whereas February experiences a minimum of 21°C (71°F) and an average of 25°C (78°F). Slightly less precipitation occurs in February, with 33 mm (1.3 in) over 12 days compared to December's 46 mm (1.8 in) over 16 days. Humidity levels are also marginally lower in February at 80%, compared to December's 82%. For a more detailed look at February weather in Castries, you can follow this link: Castries weather in February.
In comparing the weather of December and March, both months exhibit similar temperature ranges, with December seeing a minimum of 22°C (72°F), an average of 26°C (80°F), and a maximum of 30°C (86°F), while March maintains the same minimum and average but has a slightly lower maximum at 30°C (85°F). Precipitation levels are also close, with December receiving 46 mm (1.8 in) over 16 days compared to March's 38 mm (1.5 in) over 15 days. Humidity remains relatively high in both months, with December at 82% and March at 80%. For more detailed insights, you can explore Castries weather in March.
In December, temperatures in Castries range from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), with an average of 26°C (80°F). The month sees about 46 mm (1.8 in) of precipitation over 16 days, contributing to a relatively high humidity level of 82%. In contrast, April experiences slightly higher temperatures, with a minimum of 23°C (73°F) and a maximum of 31°C (87°F), while maintaining the same average temperature of 26°C (80°F). April is also drier, with only 35 mm (1.4 in) of precipitation over 14 days and a lower humidity level of 79%. For more details on the weather in April, visit Castries weather in April.
In December, the weather typically features average temperatures around 26°C (80°F) with a minimum of 22°C (72°F) and a maximum of 30°C (86°F). This month experiences moderate rainfall, with 46 mm (1.8 in) of precipitation spread over 16 days, contributing to a high humidity level of 82%.
In contrast, May sees slightly warmer temperatures, with an average of 27°C (81°F), a minimum of 23°C (74°F), and a maximum of 31°C (88°F). Precipitation is somewhat lower at 39 mm (1.6 in) over 13 days, and the humidity is slightly reduced at 80%.
For more detailed insights, check out the full overview at Castries weather in May.
In December, the weather is generally warm with temperatures ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F) and an average of 26°C (80°F). The month experiences around 46 mm (1.8 in) of precipitation across 16 days, coupled with a humidity level of 82%. In contrast, June is slightly warmer, with morning lows of 24°C (75°F) and highs reaching 31°C (88°F), averaging at 27°C (81°F). It also sees higher precipitation levels, totaling 65 mm (2.6 in) over 16 days, and maintains a similar humidity level at 83%. For more detailed information, you can check out Castries weather in June.
In December, the weather tends to be slightly cooler compared to July, with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F). December also experiences relatively less precipitation, totaling 46 mm (1.8 in) over 16 days, while the humidity remains high at 82%. In contrast, July sees warmer temperatures, with a minimum of 24°C (76°F), an average of 27°C (81°F), and a maximum of 31°C (89°F). The month is also significantly wetter, receiving 105 mm (4.1 in) of rain across 24 days and a humidity level of 84%. For a more detailed look at July's weather, visit Castries weather in July.
When comparing the weather in December and August, December tends to be slightly cooler with an average temperature of 26°C (80°F) compared to August's average of 28°C (82°F). While December features a maximum temperature of 30°C (86°F), August peaks at a higher 31°C (89°F). Precipitation in August is significantly greater, with 113 mm (4.5 in) spread over 25 days, compared to December's 46 mm (1.8 in) over 16 days. Humidity levels are similar, with December at 82% and August at 81%. For more detailed information about August weather, you can visit Castries weather in August.
When comparing the weather in December and September, December tends to be slightly cooler, with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), while September typically sees higher temperatures, with a minimum of 25°C (76°F) and a maximum of 32°C (90°F). Additionally, December experiences less precipitation, totaling 46 mm (1.8 in) over 16 days, compared to September's 121 mm (4.8 in) across 19 days. The humidity remains relatively high in both months, at 82% in December and 80% in September, contributing to a tropical feel. For a closer look at September's weather specifics, you can refer to Castries weather in September.
In December, the temperatures are slightly cooler, with a minimum of 22°C (72°F) and an average of 26°C (80°F), compared to October, where temperatures range from a minimum of 24°C (76°F) to an average of 27°C (81°F). While December enjoys a more manageable precipitation level of 46 mm (1.8 in) over 16 days, October sees a significant increase with 128 mm (5.1 in) spread across 21 days. Both months experience high humidity levels of 82%, but October's greater rainfall makes it feel wetter. For a deeper look into the October weather specifics, check out Castries weather in October.
In comparing the weather of December and November, December tends to be slightly cooler with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), while November sees a slightly warmer range of 24°C (75°F) to 31°C (87°F). Additionally, December experiences lower precipitation levels with 46 mm (1.8 in) over 16 days compared to November's 103 mm (4.1 in) over 21 days. The humidity remains relatively constant, hovering around 82% in December and 83% in November. For a detailed look at weather patterns in November, you can check out Castries weather in November.
As December settles over Castries, the weather ushers in a refreshing shift that beautifully contrasts with the previous months. With the temperature averaging a comfortable 26°C (80°F), residents and visitors alike can enjoy warm days while the humidity levels remain elevated at 82%, adding a tropical touch to the atmosphere. Although December experiences a notable increase in precipitation, with rain gracing 16 days, the overall charm lies in the lush landscapes that emerge afterward. This delightful blend of warmth and occasional showers makes December a unique month in the vibrant climate of Castries. For a deeper dive into the year-round weather patterns, explore more at Castries Climate.