Last updated: October 31, 2025
August in Gustavia, Saint Barthélemy presents a tropical climate marked by warm temperatures and vibrant summer vibes. With maximum temperatures reaching 29°C (84°F) and an average of 28°C (82°F), the weather remains pleasantly warm, perfect for beach outings and water sports. The nights cool down to a minimum of 25°C (77°F), offering a comfortable retreat. However, expect around 86 mm (3.4 in) of rainfall spread over 16 days, contributing to the island's lush greenery. The air feels notably humid at 82%, making it essential to stay hydrated while enjoying the sun-soaked days. Embrace the beauty of Gustavia in August—where every shower refreshes the land and every sunset paints the sky in stunning hues.
In Gustavia, Saint Barthélemy, August ushers in some of the warmest temperatures of the year, with minimums reaching 25°C (77°F) and averages climbing to 28°C (82°F). This tropical haven enjoys highs of 29°C (84°F), closely aligning with the patterns observed in July and September, where warmth permeates the atmosphere. As summer peaks, the gradual rise from the cooler months of early in the year showcases a delightful consistency in the island's balmy weather. The transition from June to August marks a subtle, yet noticeable increase in warmth, inviting both locals and visitors to bask in the sun-drenched beauty of this Caribbean paradise.
August marks a significant uptick in precipitation in Gustavia, Saint Barthélemy, with an average rainfall of 86 mm (3.4 in), making it one of the wettest months of the year. Following a pattern of increasing moisture, this month sees rainfall on 16 days, just slightly less than the rainiest July, which experienced 80 mm (3.2 in) over 17 days. The transition from July to August indicates a tendency towards more sustained rain, setting the stage for the even heavier deluges of September, where precipitation soars to 152 mm (6.0 in). This trend suggests that while August can be wet, it often serves as a precursor to the more intense rainy season ahead.
In August, the humidity in Gustavia, Saint Barthélemy hovers around a comfortable 82%. This month marks a slight decrease from the peak of 83% observed in July, reflecting the beginning of a gradual decline as summer transitions into fall. Throughout the year, humidity has been consistently high, maintaining an average of around 77% to 83% from January to July, with only modest fluctuations. As we move toward the cooler months, the levels typically dip to 80% in September and further to 79% in October, showcasing a subtle yet noticeable trend in humidity as the seasons shift. This persistent humidity contributes to the island's lush landscapes and vibrant tropical atmosphere, making Gustavia an alluring destination year-round.
In August, Gustavia experiences a consistently high UV Index of 13, classified as extreme, which necessitates careful sun protection, as burn time is a mere 10 minutes. This trend of elevated UV exposure begins in February and persists through August, emphasizing a critical period for sun safety in Saint Barthélemy. The extreme ratings from March to August highlight the importance of daily precautions, such as applying sunscreen and seeking shade, to minimize the risk of sunburn. As the year progresses, the UV Index begins to gradually decrease in October to 12, offering a slight reprieve before returning to lower indices in the late fall and winter months. For more detailed insights on UV levels, visit Gustavia UV Index.
UV Risk Categories
August in Gustavia, Saint Barthélemy, basks in an impressive 352 hours of sunshine, marking it as one of the sunniest months of the year. This delightful summer month follows the peak sunshine of July, which boasts 364 hours, illustrating a trend of abundant daylight during the summer. As the island transitions from the high summer, August retains a vibrant glow, outshining the early months of the year like January (259 hours) and even April (350 hours). With September bringing a slight dip to 323 hours, August stands out as a golden opportunity for sun-seekers to enjoy the islands' stunning beaches and picturesque views under the warm Caribbean sun.
In August, Gustavia, Saint Barthélemy experiences a 47% chance of sunny weather, positioning it alongside April and July as one of the more overcast months. A closer look at monthly trends reveals that while the summer months tend to witness lower chances of sunshine, the pattern shifts dramatically toward clearer skies as the year progresses. The sun shines more brightly from November to March, boasting probabilities between 67% and 72%. Consequently, if you're seeking more reliable sunshine, planning your trip for the end of the year may be your best bet, given the typical dip in sunlight during mid-summer.
In Gustavia, Saint Barthélemy, the daylight duration in August offers a delightful balance, with 12 hours of sunlight illuminating the island. This month’s daylight is consistent with the preceding months of June and July, which boast a bit more sunshine at 13 hours. As summer begins to fade, August marks a point where daylight starts to stabilize, giving way to the gradual decline into autumn, where daylight dips back to 11 hours by October. Overall, this pattern highlights a vibrant summer, transitioning smoothly into the more moderate light of fall, while maintaining a tropical charm that characterizes this stunning destination year-round.
In August, Gustavia, Saint Barthélemy, experiences a pleasant average wind speed of 7.1 m/s (16 mph), creating an inviting atmosphere for beachgoers and sailors alike. This solid gust aligns closely with the conditions seen in May and July, showcasing a trend of relatively mild winds during the peak summer months. As the summer unfolds, prior to August, the wind speeds rise gradually from 6.4 m/s (14 mph) in April to their peak of 8.4 m/s (19 mph) in July, before dipping slightly in September to 5.3 m/s (12 mph). This pattern reveals a transitional phase where August balances invigorating breezes with serene warmth, making it an ideal time to soak up the splendid Caribbean charm.
Weather in Gustavia varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Gustavia, focusing on differences in temperature, rainfall, humidity, and UV levels.
In August, the weather is characterized by warmer temperatures, with a minimum of 25°C (77°F) and an average of 28°C (82°F), reaching a maximum of 29°C (84°F). This month also sees higher precipitation levels, with 86 mm (3.4 in) spread over 16 days, contributing to a humid atmosphere with 82% humidity. In contrast, January offers slightly cooler conditions, with temperatures ranging from a minimum of 23°C (74°F) to a maximum of 27°C (81°F) and an average of 25°C (78°F). The precipitation in January is significantly lower at 35 mm (1.4 in) across 13 days, and the humidity is reduced to 77%. For more detailed information, you can check Gustavia weather in January.
August and February exhibit notable differences in weather patterns. In August, temperatures are generally higher, with a minimum of 25°C (77°F) and an average of 28°C (82°F), peaking at 29°C (84°F). This month also sees more humidity at 82% and significant precipitation, totaling 86 mm (3.4 in) over 16 days. In contrast, February is milder, with temperatures ranging from a minimum of 22°C (72°F) to an average of 25°C (77°F), and a maximum of 26°C (80°F). Precipitation is considerably lower in February, amounting to 35 mm (1.4 in) across 11 days, accompanied by a slightly lower humidity of 77%. For more detailed insights, you can explore Gustavia weather in February.
In August, the weather tends to be warmer and more humid, with average temperatures around 28°C (82°F) compared to March's milder average of 25°C (77°F). August also experiences more precipitation, totaling 86 mm (3.4 inches) over approximately 16 days, while March has significantly less at 27 mm (1.1 inches) across about 10 days. The humidity levels are slightly higher in August at 82%, compared to March's 77%, contributing to a more tropical feel during the summer month. For more detailed information about the weather in March, you can check Gustavia weather in March.
When comparing the weather in August and April, August tends to be warmer and more humid. The average temperature in August is around 28°C (82°F), with a max of 29°C (84°F), while April's average is slightly cooler at 25°C (78°F), peaking at 27°C (81°F). Additionally, August experiences higher humidity at 82% compared to April's 78%. Precipitation is also more frequent in August, with 86 mm (3.4 in) falling over 16 days, compared to April's lighter rain of 34 mm (1.3 in) over 11 days. For more detailed insights on April weather, you can check Gustavia weather in April.
In comparing the weather between August and May, August tends to be slightly warmer, with average temperatures reaching around 28°C (82°F) and maximum temperatures peaking at 29°C (84°F). In contrast, May generally has a cooler average temperature of 26°C (79°F) and a maximum of 28°C (82°F). Precipitation also increases notably in August, with 86 mm (3.4 in) occurring over 16 days, compared to May's 47 mm (1.8 in) spread across 12 days. Humidity levels are similar, with August at 82% and May at 79%. For more detailed insights into the weather patterns, you can check Gustavia weather in May.
In comparing the weather between August and June, we can see some similarities and differences. Both months feature warm temperatures, with August slightly warmer, averaging around 28°C (82°F) compared to June's average of 27°C (81°F). Notably, the minimum temperature in August is 25°C (77°F), similar to June's 25°C (76°F). However, August experiences higher precipitation, with 86 mm (3.4 in) over 16 days, whereas June has only 49 mm (1.9 in) across 14 days. Humidity levels are almost equivalent, with August at 82% and June at 81%. For a more detailed look at June's specific weather patterns, you can visit Gustavia weather in June.
In comparing the weather between July and August, both months exhibit warm temperatures, with minimums consistently around 25°C (77°F) and maximums reaching up to 29°C (84°F). However, August tends to be slightly warmer overall, boasting an average temperature of 28°C (82°F) compared to July's 27°C (81°F). Precipitation levels are quite similar, with August recording 86 mm (3.4 in) of rain over 16 days, while July sees 80 mm (3.2 in) of rain across 17 days. Humidity remains high in both months, with August at 82% and July just a notch higher at 83%. For a more detailed look at July weather in Gustavia, you can visit Gustavia weather in July.
In August, the weather remains consistently warm with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (84°F), accompanied by an average temperature of 28°C (82°F). The month experiences 86 mm (3.4 in) of precipitation over 16 days, alongside fairly high humidity levels at 82%. In contrast, September retains similar temperatures but sees an increase in rainfall, with precipitation totaling 152 mm (6.0 in) over 22 days. The humidity slightly decreases to 80%, while maximum temperatures reach up to 29°C (85°F). For more detailed information about weather patterns in September, you can visit Gustavia weather in September.
August and October exhibit relatively similar temperature ranges, with August experiencing an average of 28°C (82°F) and October slightly cooler at an average of 27°C (81°F). Both months have minimum temperatures around 25°C (77°F) and maximums near 29°C (84°F in August and 85°F in October). However, October tends to be wetter, with a precipitation total of 113 mm (4.4 in) over 19 days, compared to August's 86 mm (3.4 in) over 16 days. Additionally, humidity levels are a bit lower in October at 79%, while August maintains a higher humidity level of 82%. For more details, visit Gustavia weather in October.
In comparing the weather between August and November, we notice several similarities and a few differences. August tends to be slightly warmer, with average temperatures hitting around 28°C (82°F) compared to November's average of 27°C (80°F). However, the minimum temperatures in both months are quite close, with August at 25°C (77°F) and November at 24°C (76°F). One notable difference is in precipitation; November experiences slightly more rainfall, with a total of 95 mm (3.8 in) over 17 days, compared to August’s 86 mm (3.4 in) over 16 days. Additionally, humidity levels are marginally lower in November at 79%, compared to August's relatively high 82%. For more detailed information on November weather, check out Gustavia weather in November.
August and December present a notable contrast in weather patterns. In August, temperatures range from a minimum of 25°C (77°F) to a maximum of 29°C (84°F), with an average of 28°C (82°F). The month experiences higher precipitation at 86 mm (3.4 in) over about 16 days, accompanied by high humidity levels of 82%.
In comparison, December has slightly cooler temperatures, with 24°C (75°F) as the minimum and 28°C (82°F) as the maximum, averaging 26°C (79°F). Precipitation decreases significantly to 48 mm (1.9 in) spread over 17 days, and humidity also drops to 78%. For a more detailed look at the weather in December, you can visit Gustavia weather in December.
In August, Gustavia experiences a warm and humid climate, with temperatures averaging around 28°C (82°F) and a higher likelihood of rainfall, as the month sees approximately 16 days of precipitation. This heightened humidity, often reaching 82%, differentiates August from the drier months earlier in the year. Visitors can expect tropical warmth, perfect for beach activities, though they should be prepared for occasional showers that are typical of the Caribbean's summer season. For a more in-depth look at the weather trends throughout the year, visit Gustavia Climate.