Last updated: August 21, 2025
August in Saint John's, Antigua and Barbuda offers a warm and tropical atmosphere, with maximum temperatures reaching 29°C (84°F) and an average of 27°C (82°F), ensuring a comfortable climate for visitors. Humidity tends to hover around a balmy 83%, enhancing the island's sultry feel. However, travelers should be prepared for the likelihood of rain, as the precipitation amount totals 97 mm (3.8 in) over 18 days, showcasing the vibrant life brought by occasional showers. This month presents a unique blend of sun, warmth, and refreshing rains, making it a quintessential Caribbean experience.
August in Saint John's, Antigua and Barbuda continues the trend of warm Caribbean temperatures, making it a perfect time for beach lovers and sun seekers. With minimum temperatures hovering around 25°C (78°F) and averages peaking at 27°C (82°F), the month sees highs reaching 29°C (84°F). This consistent warmth follows the gradual increase evident from earlier months, with July's max temps only slightly trailing August's. As the summer season progresses, the island maintains its inviting climate, offering visitors a vibrant tropical experience amid balmy evenings and plenty of sunshine.
In August, Saint John's, Antigua and Barbuda, experiences a notable increase in precipitation, with an average rainfall of 97 mm (3.8 in), marking the peak of the wet season. This month witnesses approximately 18 rainy days, contributing to the lush, vibrant landscapes that define the island. As summer transitions into fall, the rainfall begins to significantly rise compared to previous months—July saw 81 mm (3.2 in) over 19 days. The trend of escalating precipitation continues into September, where totals soar to 144 mm (5.7 in), indicating the peak of the rainy season. This pattern highlights the importance of August as a pivotal month in the climatic calendar, bridging the gap to the more intense precipitation that follows.
In August, Saint John's, Antigua and Barbuda experiences a humidity level of 83%, slightly lower than the peak of 84% recorded in July. This trend reflects the gradual decline in humidity that begins in mid-summer, as the region transitions towards the drier months of autumn. Throughout the year, humidity remains consistently high, with averages ranging between 76% and 84%. Notably, the summer months demonstrate a noticeable increase, peaking in July before starting to wane in August and continuing to decrease into the fall. This pattern creates a warm, muggy climate typical of the Caribbean, contributing to the lush, vibrant landscapes that the island is renowned for.
In August, Saint John's, Antigua and Barbuda experiences a UV Index of 13, categorizing it as extreme and necessitating quick sun safety measures. This month sees a slight dip from July's peak of 14 but maintains the same intensity as both June and September, suggesting a consistent trend of frequent high UV levels during the summer months. With an average burn time of just 10 minutes, it's crucial for residents and visitors alike to remain vigilant, seek shade, and apply effective sunscreen to protect against harmful rays. As you enjoy the tropical sun, remember to stay informed about local conditions by visiting Saint John's UV Index.
UV Risk Categories
In August, sunshine graces Saint John's with an impressive 352 hours of radiant light, making it one of the sunniest months of the year. This warmth follows a bustling July, which boasts the peak hours of 361, and mirrors the vibrant atmosphere that summer brings to this Caribbean paradise. As August transitions into September, there's a gentle decline in sunshine, yet the month still holds its own with more sunlight than several other months, maintaining an inviting glow. Overall, the trend shows a captivating dance of sunshine from January’s 262 hours to a summer high, reflecting the island's allure and its consistent embrace of bright, cheerful days throughout the year.
In August, Saint John's, Antigua and Barbuda, showcases a moderate likelihood of sunny weather, with a 48% chance of sunshine. This marks a slight dip from the previous month, July, which enjoys a 50% chance. Looking at the broader picture, August sits amid a fluctuating trend of sunshine throughout the year. The earlier months, particularly February and March, boast much higher probabilities of clear skies at 71% and 64% respectively, while summer months, including June with only a 26% chance, highlight the variability the region experiences. As the year progresses into late summer, the chances of sunny weather rise again, promising a vibrant close to the summer season in the months that follow.
In August, Saint John's, Antigua and Barbuda, enjoys a pleasant 12 hours of daylight, continuing the trend seen throughout the summer months. Following the peak of 13 hours in both June and July, daylight hours begin to moderately decrease as the island transitions toward autumn. This consistent sunlight creates an inviting atmosphere for outdoor activities and relaxation, making August a prime time to experience the vibrant beauty of the Caribbean. As summer fades, the daylight duration remains stable before dipping back to 11 hours in the cooler months, but for now, residents and visitors alike can bask in the generous light that this tropical paradise has to offer.
In August, the winds in Saint John's, Antigua and Barbuda gently slow down, with an average speed of 7.0 m/s (16 mph), slightly quieter than the breezier months of July and June. This marked reduction follows the summer months, where wind speeds peaked at 8.3 m/s and 8.1 m/s, respectively, contributing to a vibrant atmosphere perfect for outdoor activities. As the island transitions into the quieter months of September with winds dropping even further to 5.2 m/s (12 mph), August serves as a bridge, showcasing a harmonious blend of invigorating breezes and the tranquil onset of autumn. Overall, the trend indicates a gradual cooling down as summer gives way to a more serene climate, inviting both locals and visitors to enjoy the picturesque surroundings in a slightly gentler breeze.
Weather in Saint John's varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Saint John's, focusing on differences in temperature, rainfall, humidity, and UV levels.
When comparing the weather in August and January, there are notable differences in temperature, precipitation, and humidity. August tends to be warmer, with minimum temperatures around 25°C (78°F) and maximum temperatures reaching up to 29°C (84°F), while January offers slightly cooler temperatures, with a minimum of 23°C (73°F) and a maximum of 27°C (80°F). In terms of precipitation, August experiences significantly higher rainfall, totaling 97 mm (3.8 in) over 18 days, compared to January's 34 mm (1.4 in) across 12 days. Humidity levels are also higher in August at 83%, while January sees a more comfortable 77%. For more detailed information, you can check Saint John's weather in January.
In comparing the weather between August and February, August experiences warmer temperatures with a minimum of 25°C (78°F) and an average of 27°C (82°F), reaching up to a maximum of 29°C (84°F). This month is also characterized by higher humidity at 83% and more frequent precipitation, totaling 97 mm (3.8 in) over 18 days. In contrast, February presents a cooler climate, with temperatures ranging from a minimum of 22°C (72°F) to a maximum of 26°C (80°F) and an average of 25°C (77°F). Additionally, February sees significantly lower precipitation at 36 mm (1.4 in) across 14 days and a slightly reduced humidity level of 76%. For more detailed insights, you can check Saint John's weather in February.
In August, the weather in Saint John's is typically warmer, with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 29°C (84°F) and an average of 27°C (82°F). The month sees significant precipitation, accumulating 97 mm (3.8 in) over approximately 18 rainy days, contributing to a high humidity level of 83%. In contrast, March experiences slightly cooler temperatures, with a minimum of 23°C (73°F), average of 25°C (77°F), and a maximum of 26°C (80°F). March also has lower precipitation, totaling 31 mm (1.2 in) across about 11 days, and humidity is somewhat lower at 76%. For a more detailed look at March weather, visit Saint John's weather in March.
In comparing the weather between April and August, April tends to be slightly cooler, with average temperatures reaching 25°C (78°F) compared to August's warmer average of 27°C (82°F). The maximum temperatures in April peak at 27°C (82°F), while in August, they rise to 29°C (84°F). Precipitation is significantly higher in August, with 97 mm (3.8 in) falling over 18 days, compared to just 38 mm (1.5 in) over 14 days in April. Additionally, humidity levels are higher in August at 83%, while April maintains a more comfortable level of 78%. For a detailed overview of April weather, you can visit Saint John's weather in April.
Comparing the weather in August and May reveals some interesting differences. In August, temperatures are slightly warmer, with minimums around 25°C (78°F) and averages peaking at 27°C (82°F), while May offers a more moderate climate with minimums at 24°C (75°F) and averages of 26°C (79°F). Precipitation is notably higher in August, totaling 97 mm (3.8 in) over 18 days, compared to May's 49 mm (1.9 in) over 15 days. Additionally, August experiences higher humidity at 83%, while May is slightly less humid at 79%. For more specifics on May weather, you can visit Saint John's weather in May.
August tends to be slightly warmer than June, with average temperatures peaking at 27°C (82°F) compared to June's average of the same temperature. However, August experiences higher maximum temperatures at 29°C (84°F), alongside a minimum of 25°C (78°F), while June's maximum is 28°C (83°F) with a minimum of 24°C (76°F). Additionally, August is wetter, receiving 97 mm (3.8 in) of precipitation over 18 days, contrasting with June's 52 mm (2.0 in) over 14 days. Humidity also rises slightly in August at 83%, compared to 81% in June. For a detailed look at June weather in Saint John's, visit Saint John's weather in June.
In comparing the weather between August and July, we see that both months have similar temperature ranges, with minimums of 25°C (78°F), average temperatures around 27°C (82°F), and maximums peaking at 29°C (84°F). However, August experiences slightly more precipitation, totaling 97 mm (3.8 in) over 18 days, compared to July's 81 mm (3.2 in) over 19 days. Humidity levels are also comparable, with August at 83% and July slightly higher at 84%. For more detailed insights, you can check Saint John's weather in July.
In comparing the weather between August and September, both months maintain relatively warm temperatures, with August averaging 27°C (82°F) and September slightly higher at 28°C (82°F). While the minimum and maximum temperatures are quite similar, September experiences a notable increase in precipitation, reaching 144 mm (5.7 in) over 21 days compared to August's 97 mm (3.8 in) over 18 days. Additionally, humidity is slightly lower in September at 80%, compared to August's 83%, leading to a marginally more comfortable atmosphere. For a more detailed overview of September weather, you can check out Saint John's weather in September.
In comparing the weather between August and October, both months experience similar temperature ranges, with minimums around 25°C (78°F), averages near 27°C (82°F), and maximums peaking at about 29°C (84°F in August and 85°F in October). However, October tends to be slightly wetter, with an increase in precipitation to 109 mm (4.3 in) compared to August's 97 mm (3.8 in), while maintaining the same number of rainy days at 18. Additionally, humidity levels are a bit lower in October at 79%, compared to August's 83%. For a more detailed look at October’s weather, you can check out Saint John's weather in October.
In comparing the weather conditions of August and November, both months exhibit similar warmth with average temperatures around 27°C (80°F). August typically sees a slightly higher range, with maximum temperatures reaching 29°C (84°F) compared to November's peak of 28°C (83°F). Precipitation is quite close as well, with August receiving 97 mm (3.8 in) over 18 days and November just a tad lower at 94 mm (3.7 in) over 17 days. Humidity is also somewhat lower in November at 80%, making it a bit more comfortable than August's higher humidity level of 83%. For more detailed insights into November's weather, check out Saint John's weather in November.
In August, the weather is typically warm and humid, with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 29°C (84°F) and an average temperature of 27°C (82°F). This month also sees significant rainfall, with a total precipitation of 97 mm (3.8 in) over 18 days, contributing to a high humidity level of 83%. In contrast, December brings slightly cooler temperatures, with minimums at 24°C (75°F) and maximums reaching 28°C (82°F), while maintaining an average of 26°C (79°F). Precipitation is notably lower in December, with only 52 mm (2.1 in) spread across the same 18 days, and humidity drops to 78%. For more details, you can check Saint John's weather in December.
August in Saint John's stands out with its warm embrace, where average temperatures climb to an inviting 27°C (82°F), offering a tropical allure that contrasts with the cooler months. Despite the high humidity of 83%, the occasional rainfall—spanning 18 days and totaling 97 mm—enriches the landscape and adds a refreshing touch to the vibrant atmosphere. This month not only captures the essence of summer but also hints at the lush greenery that follows. For those intrigued by the nuances of the region's climate, explore more at Saint John's Climate.