Last updated: August 21, 2025
August in Cayenne, French Guiana, offers a tropical climate characterized by warm temperatures and high humidity. Daily maximums reach around 32°C (89°F), settling to an average of 27°C (81°F), while nighttime lows hover at a comfortable 24°C (75°F). This month also sees a substantial amount of rainfall, with 92 mm (3.6 in) spread across approximately 18 rainy days, contributing to the region's lush greenery. The air is consistently humid, averaging around 80%, making August a true representation of the tropical allure that Cayenne has to offer.
In August, Cayenne, French Guiana experiences a delightful rise in temperatures, marking a shift toward the warmer side of its tropical climate. The month sees minimum temperatures settle around 24°C (75°F) and average a comfortable 27°C (81°F), while the daytime highs can reach up to 32°C (89°F). This pattern reflects a gradual increase in heat compared to the earlier months of the year, particularly as the region transitions towards September, where even warmer temperatures persist. The combination of warmth with consistently mild evenings makes August an inviting time to explore the lush landscapes and vibrant culture of this Caribbean gem. Overall, the trends indicate that warmth is a constant companion in Cayenne, especially as summer unfolds.
In August, Cayenne, French Guiana experiences a significant reduction in precipitation, with only 92 mm (3.6 in) of rain falling over approximately 18 days. This marks a distinct drop from the previous months, particularly from the peak wetness of May and June, which see over 500 mm of rainfall. The transition into August signals a shift towards the drier season, as rainfall diminishes notably compared to the heavy showers characteristic of earlier summer months. This pattern continues into September, where precipitation further decreases to just 56 mm (2.2 in), highlighting a trend of declining moisture that defines the late winter through early spring in this tropical region.
In Cayenne, French Guiana, August's average humidity sits at a comfortable 80%, continuing the trend of elevated moisture levels characteristic of the region. Starting the year with a relatively low 78% in January, humidity begins to rise significantly by mid-year, peaking at 87% in June. Throughout the summer months, humidity remains high, with July at 81% and August showing only a slight dip. Following August, humidity levels are expected to descend gradually, resting at 79% in September and maintaining around 80% into October. This data showcases Cayenne's tropical climate, marked by its consistently high humidity, especially from June to November.
In August, Cayenne, French Guiana, maintains its position within the extreme UV Index category with a value of 13, reflecting the consistent intensity of sunlight experienced throughout the year. Notably, the UV Index has fluctuated slightly earlier in the year, reaching a peak of 16 in both March and April before stabilizing in the mid-range during the summer months. This trend reveals a remarkable consistency in the region's high UV exposure, with an unchanging burn time of just 10 minutes across all months. As such, whether you are enjoying the sun this August or planning your visit, it's essential to stay vigilant about sun protection. For more detailed information, check the Cayenne UV Index.
UV Risk Categories
In Cayenne, French Guiana, August stands out as a remarkable month for sunshine, boasting an impressive 346 hours of sunlight. This peak follows a notable upward trend that begins in the earlier months, with July also shining brightly at 331 hours. As summer progresses, the days grow longer and sunnier, culminating in August's sun-drenched bounty, which is perfect for outdoor activities and exploring the lush surroundings. After August, sunshine remains abundant as September and October continue to provide over 330 hours of brightness, ensuring that the warmth of the sun can be enjoyed well into the fall. This consistent display of sunlight not only enriches the local landscape but also enhances the vibrant culture and leisurely lifestyle found in this enchanting region.
August in Cayenne, French Guiana, experiences a notable shift in weather patterns, boasting a healthy 41% chance of sunny days. This marks a significant increase compared to the preceding months, where chances drop as low as 9% in May. Following a gradual rise through the middle of the year—evident in July's 24%—August stands out as a peak time for sunshine, leading into an even brighter September with a 45% likelihood. This trend suggests that those seeking warmth and light are most likely to find it in the late summer months, making August an ideal choice for enjoying the vibrant outdoor scenery of this tropical paradise.
In August in Cayenne, French Guiana, daylight reaches a consistent 12 hours, maintaining the trend established in the previous months. This period demonstrates a remarkable stability in light exposure, characterized by nearly equal day and night durations that extend from March through September. Following this steady stretch, daylight gradually diminishes as the year transitions to October, when it reverts to 11 hours. This rhythmic pattern of daylight creates a perfect backdrop for the region's vibrant outdoor lifestyle, where the abundance of light fosters both daily activities and natural beauty.
The August winds in Cayenne, French Guiana, typically blow at an average speed of 3.4 m/s (8 mph), marking a slight increase from the calm of July, where gusts drop to 2.8 m/s (6 mph). This gentle breeze hints at the transition from the quieter summer months toward the more dynamic conditions of the fall. Notably, this August wind speed is part of a broader trend, where the year begins with a brisker pace, peaking in February at 6.0 m/s (14 mph). As the seasons shift, the wind gradually subsides, presenting a calm backdrop that characterizes the late summer months. Overall, the gradual decline through mid-year suggests a seasonal rhythm, with August representing a gentle resurgence before the winds again pick up in the approaching months.
Weather in Cayenne varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Cayenne, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January in Cayenne exhibit relatively similar temperature ranges, with August seeing minimum temperatures of 24°C (75°F) and averages around 27°C (81°F), while January has slightly lower averages from a minimum of 23°C (74°F) to an average of 26°C (79°F). However, January experiences significantly higher precipitation, with 225 mm (8.9 in) over 23 days, compared to August's 92 mm (3.6 in) over 18 days. Despite the marginally lower humidity in January at 78%, both months maintain a noticeably humid atmosphere. For more detailed information on January weather, check out Cayenne weather in January.
In comparing the weather of August and February, both months feature warm temperatures, with August having a slightly wider range. August sees minimum temperatures of 24°C (75°F), averaging around 27°C (81°F), and peaking at 32°C (89°F). In contrast, February's temperatures range from a minimum of 24°C (75°F) to a maximum of 28°C (83°F), with an average of 26°C (79°F).
February also experiences notably higher rainfall, totaling 189 mm (7.5 in) over 24 days, compared to August's 92 mm (3.6 in) over 18 days. Additionally, while August has a higher humidity level at 80%, February's humidity is slightly lower at 76%. For more detailed information about February weather, you can visit Cayenne weather in February.
When comparing the weather in August and March, both months exhibit warm temperatures, but there are some notable differences. In August, temperatures range from a minimum of 24°C (75°F) to a maximum of 32°C (89°F), while March has slightly cooler highs, with temperatures peaking at 30°C (86°F). However, March experiences significantly higher precipitation, totaling 196 mm (7.7 in) over 25 days, compared to August’s 92 mm (3.6 in) over 18 days. Additionally, March has a slightly lower humidity level at 76% than August's 80%. For a more detailed look into the weather patterns of March, you can visit Cayenne weather in March.
When comparing the weather in April and August, both months exhibit warm temperatures, with April having slightly lower averages. In April, the minimum temperature is the same as in August at 24°C (75°F), but the average and maximum temperatures are a bit milder, peaking at 29°C (85°F) compared to August's high of 32°C (89°F). However, April experiences significantly more precipitation, with an impressive 390 mm (15.4 in) over 27 days, compared to August's 92 mm (3.6 in) across 18 days. Humidity levels are fairly similar, with April at 77% and August at 80%. For more details on the weather during April, you can visit Cayenne weather in April.
When comparing the weather in August and May, we see some notable differences. August tends to be slightly warmer with average temperatures reaching 27°C (81°F) and maximums climbing to 32°C (89°F). In contrast, May has a marginally lower average temperature of 26°C (80°F) with maximums up to 30°C (86°F). However, May experiences significantly higher rainfall, with total precipitation of 576 mm (22.7 in) over 30 days, compared to August's 92 mm (3.6 in) over 18 days. Humidity levels remain relatively consistent, with May at 78% and August at 80%. For more detailed insights, check out Cayenne weather in May.
When comparing the weather of August and June, August typically offers warmer temperatures, with minimums around 24°C (75°F) and averages reaching 27°C (81°F), while June has slightly cooler temperatures, minimums at 23°C (75°F) and an average of 26°C (79°F). Humidity levels are high in both months, but June experiences a slightly higher level at 87% compared to August's 80%. Precipitation is also significantly more pronounced in June, with 433 mm (17.1 in) of rainfall over 29 days, while August sees only 92 mm (3.6 in) spread across 18 days. For more detailed insights into June weather patterns, visit Cayenne weather in June.
In comparing the weather between July and August, both months exhibit similar minimum temperatures, with July having an average of 24°C (75°F) and August remaining steady at the same low. However, August sees a slight uptick in average temperature, averaging 27°C (81°F), compared to July's 26°C (80°F). While both months are characterized by high humidity—80% in August and 81% in July—August experiences significantly less precipitation, with 92 mm (3.6 in) over 18 days, whereas July is much wetter, receiving 269 mm (10.6 in) across 29 days. For a closer look at more August weather details, you can visit Cayenne weather in July.
In August, the weather tends to be warm and humid, with average temperatures ranging from a minimum of 24°C (75°F) to a maximum of 32°C (89°F). This month sees significant rainfall, with a total precipitation of 92 mm (3.6 in) over 18 days, contributing to the high humidity level of 80%. In contrast, September offers a slightly warmer average temperature of 28°C (82°F), while maintaining a consistent high of 32°C (90°F). The rainfall decreases to 56 mm (2.2 in) spread over 12 days, resulting in a marginally lower humidity level of 79%. For more detailed information, you can check Cayenne weather in September.
In August, temperatures typically range from a minimum of 24°C (75°F) to a maximum of 32°C (89°F), with an average temperature of around 27°C (81°F). The month sees about 92 mm (3.6 in) of precipitation over 18 days, maintaining a humidity level of 80%. In contrast, October experiences slightly higher minimum and average temperatures, with a minimum of 25°C (77°F) and an average of 28°C (82°F), while still reaching a maximum of 32°C (90°F). Rainfall decreases to 59 mm (2.3 in) over 16 days, but the humidity remains consistent at 80%. For more detailed information, you can visit Cayenne weather in October.
In comparing the weather in August and November, we see that both months feature a minimum temperature of around 24°C (75°F), an average of 27°C (81°F), and a maximum temperature that peaks slightly higher in August at 32°C (89°F) compared to November's maximum of 31°C (88°F). Despite the similar temperatures, November experiences significantly more rainfall, with 204 mm (8.0 in) of precipitation over 24 days, while August sees only 92 mm (3.6 in) across 18 days. Additionally, November's humidity is slightly higher at 85%, compared to August's 80%. For more detailed information, you can visit Cayenne weather in November.
August and December in Cayenne present distinctly different weather patterns. In August, temperatures range from a minimum of 24°C (75°F) to a maximum of 32°C (89°F), with an average of 27°C (81°F) and 18 days of rain totaling 92 mm (3.6 in). The humidity is relatively high at 80%. In contrast, December experiences slightly cooler temperatures, with a minimum of 24°C (75°F), an average of 26°C (79°F), and a maximum of 30°C (86°F). However, it also brings significantly more rainfall, with 29 days of precipitation amounting to 349 mm (13.7 in) and humidity increasing to 84%. For more specific details about December weather, you can visit Cayenne weather in December.
August in Cayenne is characterized by warm temperatures that hover around 27°C (81°F), with the daytime heat occasionally peaking at 32°C (89°F). This month stands out due to its notable precipitation, with rain gracing the city on 18 days, resulting in 80% humidity that adds to the tropical feel. Compared to other months, August sees a balance of warmth and moisture, creating a lush environment and a distinctly wet backdrop. For a deeper dive into the weather patterns year-round, visit Cayenne Climate.