Last updated: August 21, 2025
In Cayenne, French Guiana during May, the climate is characterized by warm temperatures and high humidity, making it a typical month in the region. Daily maximums hover around 30°C (86°F), while the average temperature settles at a comfortable 26°C (80°F), with nighttime lows dipping to 24°C (76°F). Rain is a common sight, as the city experiences an impressive 576 mm (22.7 in) of precipitation across 30 days, resulting in a humid atmosphere with levels reaching 78%. This blend of warmth and moisture creates a vibrant environment, highlighting the tropical essence of this enchanting locale.
In May, Cayenne, French Guiana experiences subtly warm temperatures that persist through the year. The month sees minimal fluctuations, with minimum temperatures around 24°C (76°F) and averages hovering at 26°C (80°F). Maximum temperatures can reach up to 30°C (86°F), showing a slight increase compared to earlier months like January and February. This consistency highlights a tropical climate where the warmth is steady and inviting, setting a perfect backdrop for outdoor adventures in the lush surroundings. As the month progresses, the temperatures meld into a soothing rhythm, embodying the essence of life in this vibrant region.
In May, Cayenne experiences its peak precipitation, with an impressive 576 mm (22.7 in) of rain falling over the course of 30 days. This deluge follows a notably wet April, where 390 mm (15.4 in) was recorded, marking a steep rise that signifies the height of the rainy season. The continuous rainfall not only contributes to the lush landscapes of French Guiana but also highlights a trend of increasing precipitation as the year progresses. In contrast, June sees a slight decline to 433 mm (17.1 in), yet it remains significantly high, indicating that the region remains lush and vibrant as it transitions into the drier months. Consequently, May stands out as a crucial month for both the ecosystem and the communities in Cayenne, underscoring the power of tropical rainfall.
In May, Cayenne, French Guiana experiences a humidity level of 78%, marking a slight increase from the 76% recorded in the previous months of February and March. This elevation suggests a gradual build-up of moisture in the air as the region transitions into its wetter season. Following May, a significant jump to 87% in June indicates the onset of increased rainfall, typical of the Caribbean climate. The steady humidity levels throughout the preceding months, hovering around the mid-70s to low 80s, highlight the inherent tropical characteristics of Cayenne, where warmth and moisture coexist prominently.
In Cayenne, French Guiana, May showcases an ultra-high UV Index of 14, maintaining the region's reputation for intense sun exposure, categorizing it in the extreme level, with a burn time of just 10 minutes. Following a peak in March and April, where the index reached 16, there is a slight decline but no relief, as the risk of sunburn remains severe. This consistency highlights the year-round need for sun protection in Cayenne, as even June will see similar levels of harmful UV rays. For those planning to enjoy outdoor activities, understanding the Cayenne UV Index is crucial to ensure safety under the relentless sun.
UV Risk Categories
In May, Cayenne, French Guiana basks in a delightful 260 hours of sunshine, continuing a pattern of vibrant sunlight that peaked in the prior months. After witnessing a robust 312 hours in March and a slight dip in April, May offers a balanced blend of warmth and light as it transitions towards the sunnier days of summer. As the year progresses, Cayenne's sunlight consistently increases, with the upcoming months promising even more radiant hours, particularly in August and September, when the city enjoys its sunniest stretches. This steady rise in sunshine not only enhances the region's tropical allure but also makes May a splendid time for festivities and outdoor adventures.
In Cayenne, French Guiana, May marks a notable dip in the likelihood of sunny weather, with only a 9% chance of sunshine. This contrasts sharply with the brighter months that follow, such as July and August, where chances soar to 24% and 41%, respectively. The trend throughout the year showcases a distinctive pattern: while the early months like January through March maintain a modest chance of sun, April sees a sharp decline, leading into May's cloudy disposition. However, as the year progresses into the latter half, the chances of sunny days significantly increase, peaking in September with a whopping 45% chance. Thus, while May might not offer the best odds for sun-seekers, the subsequent months promise a welcomed shift towards brighter skies.
In Cayenne, French Guiana, the daylight duration exhibits a fascinating consistency throughout the year. Starting in January and February, residents enjoy a steady 11 hours of daylight, providing a gentle introduction to the year. As March rolls in, days noticeably stretch to 12 hours, a trend that continues into April. This extended daylight sets a warm, tropical atmosphere that remains stable through much of the year, with 12 hours of sunlight prevailing from May through September. As October approaches, daylight begins to wane again, returning to 11 hours in the last months of the year. This predictable pattern reflects the tropical climate, where shifts in daylight are subtle yet rhythmic, creating an enjoyable backdrop for outdoor activities year-round.
In Cayenne, French Guiana, the month of May marks a notable shift in wind patterns, with an average wind speed of 4.1 m/s (9 mph). This gentle breeze reflects a gradual decline from the more brisk winds observed earlier in the year, such as February's peak of 6.0 m/s (14 mph). As the region transitions from April’s average of 4.4 m/s (10 mph), May becomes a quieter month, setting the stage for even lighter winds in June, which plummet to 3.1 m/s (7 mph). This trend highlights a clear seasonal cooling, suggesting that while May may not be the windiest month, its tempered breezes create a tranquil atmosphere perfect for enjoying the lush, vibrant surroundings of Cayenne.
Weather in Cayenne varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Cayenne, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January in Cayenne both feature warm temperatures, with January slightly cooler. In May, temperatures range from a minimum of 24°C (76°F) to a maximum of 30°C (86°F) with an average of 26°C (80°F). In contrast, January has a similar temperature range, with a minimum of 23°C (74°F) and a maximum of 29°C (84°F), while also averaging 26°C (79°F). However, May is significantly wetter, experiencing 576 mm (22.7 in) of precipitation over 30 days, compared to January's 225 mm (8.9 in) across 23 days of rain. Both months maintain a humidity level of 78%, creating a consistently tropical atmosphere. For more details, you can refer to Cayenne weather in January.
When comparing the weather in May and February, both months exhibit similar minimum and average temperatures, typically ranging from 24°C to 26°C (75°F to 80°F). However, May experiences higher temperatures overall, with a maximum reaching 30°C (86°F), compared to February's maximum of 28°C (83°F). Another notable difference is in precipitation; May sees significantly more rainfall at 576 mm (22.7 in) over 30 days, while February has only 189 mm (7.5 in) spread across 24 days. Additionally, humidity levels are slightly higher in May at 78%, compared to 76% in February. For a detailed look at February's climate, you can visit Cayenne weather in February.
In comparing the weather between March and May, both months exhibit similar temperature ranges, with minimums around 24°C (75-76°F), averages at about 26°C (80°F), and maximums reaching 30°C (86°F). However, May sees a significant increase in precipitation, totaling 576 mm (22.7 in) over 30 days compared to March's 196 mm (7.7 in) across 25 days. This results in a slightly higher humidity level in May at 78% compared to March’s 76%. For a more detailed look at March's weather patterns, you can explore Cayenne weather in March.
In comparing the weather between April and May, both months showcase a similar temperature range, with minimums around 24°C (75°F - 76°F) and average temperatures consistently at 26°C (80°F). However, May experiences slightly warmer maximum temperatures, reaching up to 30°C (86°F), compared to April's peak of 29°C (85°F). Precipitation in May significantly increases to 576 mm (22.7 in) over 30 days, making it wetter than April, which sees 390 mm (15.4 in) over 27 days. Humidity levels remain comparable, with May at 78% and April at 77%. For a more detailed look at April's weather, you can visit Cayenne weather in April.
In comparing the weather between May and June, both months exhibit similar temperature ranges, with May recording a minimum of 24°C (76°F) and June slightly lower at 23°C (75°F). The average temperatures remain consistent at 26°C (79°F), while the maximum temperature caps at 30°C (86°F) for both months. However, May is significantly wetter, receiving 576 mm (22.7 in) of precipitation over 30 days, compared to June's lower total of 433 mm (17.1 in) over 29 days. June also experiences slightly higher humidity levels at 87%, compared to May’s 78%. For more details on the specific climate conditions, you can visit Cayenne weather in June.
May and July share similar temperature ranges, with both months featuring minimum temperatures around 24°C (75-76°F), average temperatures of 26°C (80°F), and maximum temperatures close to 30°C (86-87°F). However, they differ significantly in terms of precipitation. May experiences a much higher rainfall of 576 mm (22.7 in) over 30 days, while July sees a substantial reduction in precipitation to 269 mm (10.6 in) over just 29 days. This results in a slightly lower humidity level in July at 81% compared to May's 78%. For a detailed look at July's weather, you can check out Cayenne weather in July.
May and August exhibit some similarities, yet notable differences in weather patterns. In May, temperatures range from a minimum of 24°C (76°F) to a maximum of 30°C (86°F), with an average of 26°C (80°F). This month also sees significant rainfall, totaling 576 mm (22.7 in) over 30 days, contributing to a humid atmosphere with humidity levels around 78%. In contrast, August experiences slightly higher temperatures, with a minimum of 24°C (75°F) and a maximum of 32°C (89°F), averaging 27°C (81°F). Precipitation drops dramatically to 92 mm (3.6 in) spread over 18 days, while humidity rises slightly to 80%. For more detailed insights, you can check Cayenne weather in August.
May and September present distinct weather patterns, each with its own characteristics. In May, the temperatures range from a minimum of 24°C (76°F) to a maximum of 30°C (86°F), with an average of around 26°C (80°F). However, this month is marked by significant rainfall, totaling 576 mm (22.7 in) over 30 days, contributing to a humid atmosphere with humidity levels around 78%.
In contrast, September sees slightly warmer temperatures, with a minimum of 24°C (76°F), an average of 28°C (82°F), and a maximum of 32°C (90°F). The precipitation significantly drops to 56 mm (2.2 in) spread across only 12 days, resulting in a drier climate while maintaining a similar humidity level of 79%. For a more detailed look at September weather, visit Cayenne weather in September.
In comparing the weather of May and October, it's evident that both months experience warm temperatures, yet October tends to be slightly hotter with average temperatures reaching 28°C (82°F) compared to May's average of 26°C (80°F). The maximum temperatures also rise, with October often hitting 32°C (90°F) versus May's peak of 30°C (86°F). However, May is characterized by significantly higher precipitation, totaling 576 mm (22.7 in) over 30 days, while October sees a much drier climate with only 59 mm (2.3 in) of rain over 16 days. Humidity levels are similar, with October slightly higher at 80% compared to May's 78%. For further details, you can explore Cayenne weather in October.
May and November offer similarly warm temperatures, with both months experiencing a minimum of 24°C (76°F). However, May typically sees slightly lower average and maximum temperatures than November, with averages of 26°C (80°F) and max highs of 30°C (86°F), compared to November's averages of 27°C (81°F) and max highs of 31°C (88°F). In terms of precipitation, May is significantly wetter, receiving 576 mm (22.7 in) over 30 days, while November has a much lighter rainfall of 204 mm (8.0 in) over 24 days. Additionally, November tends to be a bit more humid, with humidity levels at 85% compared to May's 78%. For more details, you can check Cayenne weather in November.
In comparing the weather of May and December, we see some similarities along with notable differences. Both months feature a consistent temperature range, with minimums of around 24°C (75-76°F), average temperatures near 26°C (79-80°F), and maximums reaching 30°C (86°F). However, May is significantly wetter, with 576 mm (22.7 in) of precipitation over 30 days, compared to December's 349 mm (13.7 in) over 29 days. The humidity is also slightly higher in December at 84%, compared to May’s 78%, contributing to a more muggy atmosphere. For a deeper look into December's weather specifics, check out Cayenne weather in December.
As May unfolds in Cayenne, the weather embraces a particularly humid atmosphere, with a notable increase in precipitation compared to other months. While temperatures remain warm, averaging around 26°C, the combination of high humidity and frequent rainfall creates a unique tropical ambiance. This rainfall often saturates the landscape and contributes to the lush greenery that characterizes the region, making May a vibrant yet wet experience. For those eager to understand how this month compares to the rest of the year, detailed insights await at Cayenne Climate.