Last updated: August 31, 2025
Experience the vibrant weather of Castries, Saint Lucia in August, where the tropical climate offers a delightful mix of warmth and humidity. With a maximum temperature reaching 31°C (89°F) and an average of 28°C (82°F), visitors can bask in the sun’s embrace. Nighttime cools down to a comfortable 24°C (76°F), perfect for evening strolls along the beautiful coast. Expect 113 mm (4.5 in) of rain spread across 25 days, contributing to the lush greenery that the island is renowned for. With a humidity level hovering around 81%, the air is rich and inviting, making August an ideal time for both adventure and relaxation in this enchanting paradise.
In August, Castries, Saint Lucia, experiences warm and inviting temperatures that reflect the heart of the Caribbean summer. With minimum temperatures hovering around 24°C (76°F) and an average of 28°C (82°F), the weather is perfect for beachgoers and outdoor enthusiasts. The maximum temperature often reaches 31°C (89°F), maintaining the tropical vibe that's characteristic of this beautiful island. Notably, August continues the trend of gradually rising temperatures seen since May, offering a blend of warmth and humidity that makes for lush landscapes and vibrant sunsets. As the summer draws closer to its end, visitors can enjoy the balmy days and the soothing sea breezes, making it an ideal time for adventure or relaxation.
August marks a significant peak in precipitation for Castries, Saint Lucia, with 113 mm (4.5 in) of rainfall accumulated over an average of 25 days. This increase continues the upward trend observed since June, where rainfall begins to escalate, reaching a high in July with 105 mm (4.1 in). By August, the deluge intensifies, setting the stage for the even wetter months ahead, particularly September, which records 121 mm (4.8 in). The changing patterns highlight a distinct rainy season, suggesting that visitors and locals alike may want to embrace the rhythm of the rain as it brings a lush vibrancy to the island's landscape. The frequent precipitation during this time not only nourishes the flora but also offers a refreshing experience of tropical weather, albeit with more frequent showers.
In August, Castries, Saint Lucia experiences an average humidity of 81%, maintaining a consistent level that reflects the tropical climate's characteristics. This month stands as a transition point, as humidity levels peak in July at 84% before slightly declining in the following months. Interestingly, the humidity in August mirrors that of January and comes close to the levels observed in September and October, creating a relatively stable pattern throughout the summer. As the year progresses, humidity tends to hover around the 80% mark, showcasing the region's lush, vibrant environment, yet August's levels contribute to the warm, muggy feeling typical of this period.
In August, Castries, Saint Lucia experiences a UV Index of 14, maintaining the extreme exposure category that characterizes the summer months. This peak in UV intensity reflects a broader trend seen from January through September, where the index consistently reaches high levels, prompting a burn time of just 10 minutes. The sun's potent rays remind us of the importance of sun safety during this period. As September approaches, the UV Index remains unchanged, continuing to beckon sun-seekers while urging caution. For detailed insights and precautions, visit Castries UV Index.
UV Risk Categories
In August, Castries basks in a delightful 346 hours of sunshine, mirroring the delightful warmth of the preceding months. This trend of abundant sunlight begins in January with 268 hours and steadily climbs, peaking in May with an impressive 355 hours. The impressive trajectory then holds strong through the summer months, showcasing July's sunny embrace at 348 hours. As summer transitions into autumn, sunshine remains generous, with September maintaining a solid 319 hours. This consistent availability of radiant sunshine not only enriches the island's beauty but also invites visitors to experience its vibrant culture and stunning landscapes year-round.
August in Castries, Saint Lucia, showcases a 46% chance of sunny weather, aligning with the trends observed throughout the summer months. As the year progresses from the more sun-kissed days in January and February, the likelihood of sunny weather dips in the hotter months of June and July, only to stabilize again in August. This pattern indicates that while the summer can bring occasional cloud cover, there's a fair chance that visitors can still enjoy the island's vibrant beaches and lush landscapes. Continuing into September, the sun returns with a 51% probability, promising delightful days ahead for those exploring this tropical paradise.
In Castries, Saint Lucia, the August days bask in 12 hours of daylight, consistent with the trend set since March. As the year progresses from January to February, daylight duration begins at 11 hours before gradually increasing as spring approaches. This steady rise peaks in the summer months—June through August—where the sun graces the island with abundant light, making it perfect for outdoor adventures. Following August, daylight duration remains steady into September, affirming a pattern of stability before gradually tapering off to 11 hours by late fall. This rhythmic cycle of daylight not only enhances the natural beauty of Castries but also offers a delightful backdrop for both relaxation and exploration throughout the year.
In Castries, Saint Lucia, the August wind offers a gentle respite as the average wind speed dips to 5.1 m/s (11 mph), marking a notable decrease from the earlier summer months. This downturn in wind activity continues the trend established in the preceding months of July, with its steady 6.3 m/s (14 mph), hinting at a transition towards the calmer conditions typical of late summer. Compared to the brisker speeds of January through July, August serves as a bridge into the quieter breezes of September, which further lower to 3.9 m/s (9 mph). This shift creates a serene atmosphere perfect for enjoying the sun-kissed beaches and lush landscapes, inviting visitors to embrace the tranquil beauty of Saint Lucia during this unique time of year.
Weather in Castries varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Castries, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January present quite different weather patterns, despite their similarities in humidity levels. In August, the temperatures range from a minimum of 24°C (76°F) to a maximum of 31°C (89°F), making it a warm and often humid month with an average temperature of 28°C (82°F). This month also sees significant rainfall, with 113 mm (4.5 in) spread across 25 days. In contrast, January offers milder temperatures, with a minimum of 22°C (72°F) and a maximum of 30°C (86°F), resulting in a slightly more comfortable average of 26°C (78°F). Additionally, January experiences much less precipitation, totaling only 36 mm (1.4 in) over 15 days. For more detailed information about the weather conditions in January, you can visit Castries weather in January.
August and February present distinct weather patterns, reflecting the shift in seasons. In August, temperatures are generally warmer, with an average of 28°C (82°F) and maximums reaching up to 31°C (89°F), while February features a slightly cooler average of 25°C (78°F) with a maximum of 30°C (86°F). August also tends to be wetter, experiencing about 113 mm (4.5 in) of rainfall spread over 25 days compared to February's minimal 33 mm (1.3 in) over just 12 days. Humidity levels remain high in both months, with August at 81% and February slightly lower at 80%. For a more detailed look at February's weather, check out Castries weather in February.
When comparing the weather in August and March, we see some notable differences. August typically experiences warmer temperatures with a minimum of 24°C (76°F) and an average of 28°C (82°F), reaching highs of 31°C (89°F). It also sees substantially more rainfall, averaging 113 mm (4.5 in) over 25 days, resulting in a humidity level of 81%. In contrast, March offers slightly cooler weather, with minimum temperatures of 22°C (72°F) and an average of 26°C (79°F), peaking at 30°C (85°F). The precipitation is significantly lower in March, at 38 mm (1.5 in) across 15 days, and maintains a humidity level of 80%. For more detailed information, you can check Castries weather in March.
In comparing the weather of August and April, both months feature warm temperatures, though August tends to be slightly hotter with an average of 28°C (82°F) compared to April's 26°C (80°F). The minimum temperatures are quite close, with August starting at 24°C (76°F) and April at 23°C (73°F), but August reaches the same maximum of 31°C (89°F) as April. However, August is notably wetter, with 113 mm (4.5 in) of precipitation over 25 days, while April sees significantly less with only 35 mm (1.4 in) across 14 days. Humidity levels are fairly similar, at 81% in August and 79% in April, making both months feel quite humid. For a deeper look into April's climate, you can check out Castries weather in April.
In comparing the weather of August and May, we see that both months experience warm temperatures, with August slightly warmer with an average of 28°C (82°F) compared to May's 27°C (81°F). Both months share a maximum temperature of 31°C (88°F), although August has a marginally higher minimum temperature of 24°C (76°F) compared to May’s 23°C (74°F). Precipitation levels highlight a stark difference, as August receives significantly more rain, totaling 113 mm (4.5 in) over 25 days, while May has a much lighter rainfall of 39 mm (1.6 in) over 13 days. Humidity remains high in both months, with August at 81% and May at 80%. For further details, you can explore Castries weather in May.
In comparing August and June weather, both months feature similar temperature ranges, with June slightly cooler on average. August has a minimum temperature of 24°C (76°F) and an average of 28°C (82°F), mirroring June's minimum and slightly exceeding its average of 27°C (81°F). However, August sees a significant increase in precipitation, recording 113 mm (4.5 in) across 25 days, compared to June’s 65 mm (2.6 in) over 16 days. Humidity levels are relatively close, with August at 81% and June at 83%, making the air feel similarly muggy. For more detailed information, you can check Castries weather in June.
Comparing the weather in August and July reveals some interesting similarities and differences. Both months experience a minimum temperature of 24°C (76°F), while August has a slightly higher average temperature of 28°C (82°F) compared to July's 27°C (81°F). The maximum temperature remains the same at 31°C (89°F) for both months. In terms of precipitation, August sees a total of 113 mm (4.5 in) over 25 days, which is slightly more than July's 105 mm (4.1 in) across 24 days. Additionally, humidity levels are a bit lower in July at 84%, compared to August's 81%. For more detailed information about July's weather, you can check out Castries weather in July.
August and September share similar temperatures, with September experiencing just a slight increase; the minimum temperature rises from 24°C (76°F) in August to 25°C (76°F) in September. Both months have an average temperature of 28°C (82°F) for August and 28°C (83°F) for September, while September reaches a maximum temperature of 32°C (90°F), slightly warmer than August's 31°C (89°F). In terms of precipitation, September sees a small increase in rainfall to 121 mm (4.8 in) over 19 days compared to August's 113 mm (4.5 in) over 25 days, with humidity remaining fairly consistent at 80% in September and 81% in August. For more details on the weather in September, please visit Castries weather in September.
In comparing the weather between August and October, both months exhibit warm temperatures, but October tends to be slightly cooler on average. August has a minimum temperature of 24°C (76°F) and an average of 28°C (82°F), while October's average is just a notch lower at 27°C (81°F), despite a similar minimum. Interestingly, October sees a maximum temperature that matches August's peak at 32°C (89°F). Precipitation slightly increases in October to 128 mm (5.1 in) over 21 days compared to August's 113 mm (4.5 in) over 25 days, indicating a bit more concentrated rainfall. Humidity levels are almost equal, with October at 82% and August at 81%. For more detailed information, you can visit Castries weather in October.
August and November share some similarities in weather, with both months featuring warm temperatures and high humidity. In August, temperatures range from a minimum of 24°C (76°F) to a maximum of 31°C (89°F), with an average of 28°C (82°F). The month sees considerable rainfall, totaling 113 mm (4.5 in) over 25 days. In contrast, November maintains a similar temperature profile, with minimums and maximums of 24°C (75°F) and 31°C (87°F) respectively, averaging 27°C (81°F). Precipitation is slightly lower at 103 mm (4.1 in) across 21 days, and humidity is marginally higher at 83%. For more details about November weather, visit Castries weather in November.
In comparison to August, December offers slightly cooler temperatures, with a minimum of 22°C (72°F) and a maximum of 30°C (86°F), compared to August's range of 24°C (76°F) to 31°C (89°F). The average temperature in December is 26°C (80°F), which is a bit more comfortable than August's 28°C (82°F). Additionally, December experiences significantly less precipitation, with just 46 mm (1.8 in) over 16 days, while August sees 113 mm (4.5 in) over 25 days. Humidity levels remain similar, at 81% in August and slightly higher at 82% in December. For more details, you can check Castries weather in December.
August in Castries stands out with its warm temperatures and heightened humidity, creating a lively tropical atmosphere. As the summer season peaks, the average daily warmth lends itself to beach days and outdoor adventures, despite the increased chance of rain, with frequent showers often gracing the skies. This month's challenges include navigating around precipitation, which arrives on a good number of days, contributing to an overall lush landscape. If you're curious about how the weather in August compares to the rest of the year, be sure to check out Castries Climate for a comprehensive overview.