Last updated: January 18, 2025
Guyane, also known as French Guiana, is characterized by its tropical rainforest climate, classified under the Köppen-Geiger system as Af. With an average annual temperature around 26°C (80°F), the region experiences a minimum of 19°C (66°F) in January, while September can see temperatures soaring to a maximum of 39°C (102°F). This climate supports a rich biodiversity and influences the unique ecological and cultural tapestry of the region.
In Guyane, French Guiana, temperature patterns exhibit a distinct tropical rhythm with minimal seasonal variation. During the cooler months of January to March, temperatures range from a low of 19°C (66°F) to a max of 35°C (96°F), establishing a comfortable average around 26°C (79°F). As the year progresses into the warmer months of April through September, temperatures gradually rise, with September reaching peak highs of 39°C (102°F). The transition from the dry months to the more humid season initiates in July, reflected in the slight uptick in averages, peaking in August at 27°C (81°F). This pattern underscores the region's warm, humid climate, punctuated by a brief respite before the year's end as temperatures return to their more moderate averages in December.
In French Guiana, the climate varies slightly across regions. In Saint-Laurent-du-Maroni, temperatures range from a minimum of 21°C (70°F) in December to a maximum of 35°C (95°F) in September monthly temperatures in Saint-Laurent-du-Maroni. Kourou experiences a minimum temperature of 23°C (73°F) in July and peaks at 31°C (88°F) in October monthly temperatures in Kourou. Meanwhile, Cayenne has temperatures ranging from 23°C (74°F) in January to a maximum of 32°C (90°F) in September monthly temperatures in Cayenne.
Guyane, French Guiana, experiences a tropical climate with significant precipitation throughout the year, characterized by distinct wet and dry periods. Early months, January through March, recorded moderate rainfall, with January averaging 195 mm (7.7 in) over 21 days, followed by February and March with 164 mm (6.5 in) and 172 mm (6.8 in), respectively. As the region approaches the peak wet season in April to June, rainfall intensifies, reaching a peak of 497 mm (19.6 in) in May alone, with precipitation frequency also increasing, especially in April, which sees approximately 26 rainy days.
As summer progresses into late August and September, precipitation significantly decreases, with September recording only 72 mm (2.8 in) over 13 days, marking one of the driest periods of the year. The trend of reduced rainfall continues into October, where only 65 mm (2.6 in) is measured across 15 days. However, precipitation begins to rebound in November with 192 mm (7.5 in) and culminates in December with 302 mm (11.9 in), as the wet season nears its climax once again, indicating a highly dynamic and cyclical precipitation pattern throughout the year.
In Guyane, French Guiana, sunshine duration displays a clear seasonal trend, showcasing a steady increase from early in the year to the mid-summer months. Beginning with 238 hours of sunshine in January, the region experiences gradual growth, culminating in 304 hours by March. This upward trajectory peaks in the summer months of July and August, where residents and visitors alike can bask in an impressive 320 hours and 342 hours of sunshine, respectively. This period not only represents the sunniest stretch of the year but also aligns with the region's vibrant outdoor activities and ecotourism.
As the year progresses into the latter part, sunlight hours begin to slightly taper off in September and October, yet remain notably high at 335 hours and 340 hours. The autumn months, particularly November and December, see a decrease again, with sunshine durations falling to 296 hours and 278 hours. This seasonal pattern indicates a well-defined cycle of sun exposure, where the peak sunshine months foster an inviting atmosphere, while the diminishing light in late autumn signals the gradual transition toward the wetter months ahead. Overall, Guyane's climate offers a dynamic interplay of sunshine, providing ample opportunities for sun lovers, particularly in the summer months.
In Guyane, French Guiana, the UV Index exhibits consistently high levels throughout the year, reflecting the region's tropical climate and proximity to the equator. Starting with an Index of 14 in January, it quickly escalates to 16 in both March and April, marking these months as some of the most intense in terms of UV exposure. The categorization as "extreme" during this period underscores the need for adequate sun protection, as a mere 10 minutes of unprotected exposure could result in skin damage. Even as the months progress into summer, the UV Index remains notably elevated, with values hovering around 12 to 16.
In the latter half of the year, the UV Index demonstrates slight fluctuations but generally remains within the extreme category from January through November. With figures stabilizing around 12 to 13 during mid to late summer, it is crucial to maintain protective measures against harmful UV rays. This persistent intensity throughout the year emphasizes the significance of vigilance when enjoying outdoor activities in Guyane, as the risk of sunburn remains a consistent concern, regardless of the season.
UV Risk Categories
In Guyane, French Guiana, daylight duration remains relatively consistent throughout the year, reflecting the region's equatorial location. During the first two months, January and February, residents enjoy approximately 11 hours of daylight, providing a balanced exposure to sunlight. As the year progresses into March, daylight extends to 12 hours and maintains this longer duration through April, May, and into the mid-summer months. This steady increase allows for ample opportunities to explore the lush landscapes and diverse ecosystems that define Guyane.
As the days continue through the latter part of the year, daylight duration stabilizes at 12 hours from June to September, before gradually decreasing back to 11 hours in October, November, and December. This cyclical pattern of daylight not only supports the region's vibrant biodiversity but also creates a reliable rhythm for daily life and activities. Despite the slight variations, the consistent daylight duration ensures that Guyane remains a destination for those seeking both adventure and a closer connection to nature, regardless of the season.
Cayenne, French Guiana, experiences a tropical climate characterized by consistent warmth throughout the year. Average temperatures range from 26°C (79°F) to 28°C (82°F), with maximums peaking at 32°C (90°F) in the warmer months of August and September. Rainfall is significant, particularly in May (576 mm) and April (390 mm), contributing to a lush environment. Despite the heavy rains, sunshine hours are ample, especially from July (331 hours) through October (342 hours). For more details, visit Cayenne climate.
Kourou, French Guiana experiences a tropical climate characterized by consistently warm temperatures ranging from a minimum of 23°C to a maximum of 31°C throughout the year. The region experiences significant rainfall, particularly from April to June, where monthly totals can exceed 500 mm, with May being the wettest month. Sunshine hours vary, peaking in August with around 340 hours, providing ample daylight, especially after the rainy season. Despite the rainfall, the climate remains humid and warm year-round, making it a unique environment. For more detailed information, visit Kourou climate.
Saint-Laurent-du-Maroni, located in French Guiana, experiences a tropical climate characterized by consistently warm temperatures throughout the year, with averages hovering around 26°C (79°F) and maximums reaching up to 35°C (95°F) in the hottest months. The region receives significant rainfall, particularly from April to June, with May recording the highest average of 410 mm (16.2 in). Sunshine hours vary, peaking in August with 343 hours, ensuring a vibrant, sunny atmosphere despite the heavy precipitation. This climate is ideal for those who enjoy lush landscapes and tropical weather. For more detailed information, please visit Saint-Laurent-du-Maroni climate.
In conclusion, Guyane, French Guiana, presents a remarkable tropical climate characterized by consistent warmth, abundant rainfall, extended sunshine, and high UV exposure throughout the year. The climate not only fosters a rich biodiversity but also offers a unique backdrop for outdoor activities and ecological exploration. Key seasonal patterns, such as the peak sunshine hours and elevated UV Index during the warmer months, highlight the importance of sun protection for residents and visitors alike. Additionally, the steady daylight duration reinforces the region's dependable rhythm, allowing for a vibrant lifestyle immersed in nature's wonder. As such, Guyane remains an alluring destination that captivates all who wish to experience its stunning landscapes and diverse ecosystems.