Last updated: August 21, 2025
December in Cayenne, French Guiana offers a warm tropical climate with average temperatures hovering around 26°C (79°F), reaching a maximum of 30°C (86°F) and rarely dropping below 24°C (75°F). Travelers should be prepared for significant humidity levels at 84%, creating a lush and vibrant atmosphere. Rainfall is abundant, with a staggering 349 mm (13.7 in) accumulated over 29 days—a hallmark of the region’s wet season. This precipitation transforms the landscape into a vivid tapestry of green, inviting visitors to experience the natural beauty of Cayenne, all while embracing the warm and humid tropical embrace.
In December, temperatures in Cayenne, French Guiana, remain comfortably warm, showcasing a slight consistency in the region's tropical climate. With minimums around 24°C (75°F) and maximums peaking at 30°C (86°F), the weather is inviting for both locals and visitors. The average temperature hovers at 26°C (79°F), mirroring the stable warmth seen throughout the preceding months. Unlike the sharp peaks often observed in the summer months, December presents a more subdued variation, maintaining a delightful balance indicative of the region's overall climate trend. This mildness, coupled with the holiday spirit, makes December an appealing time to experience the vibrant culture and natural beauty of Cayenne.
December in Cayenne, French Guiana, marks the close of the year with a significant increase in precipitation, totaling 349 mm (13.7 in) over 29 days of rainfall. This uptick follows the notable patterns established in earlier months, where the rainy season peaks in May with a striking 576 mm (22.7 in) yet gradually subsides by August, where precipitation drops to a mere 92 mm (3.6 in). However, December showcases a resurgence, indicative of the transitional nature of the region's climate as it approaches the end of the wet season. Comparative to November's 204 mm (8.0 in), December's figures highlight a robust return to wetter conditions, paving the way for a vibrant and lush landscape, characteristic of Cayenne's tropical milieu.
In Cayenne, French Guiana, the humidity levels exhibit a notable trend as the year progresses. Beginning with a relatively comfortable 78% in January, the humidity dips slightly to 76% in both February and March. As the months roll on, humidity gradually increases, reaching 78% in May. The real shift occurs in June, where the humidity surges to a hefty 87%, signaling the onset of wetter conditions. Following this peak, the levels begin to stabilize, with December landing at 84%. This consistent pattern highlights the region's tropical climate, blending warmth with considerable moisture as the year closes.
In December, Cayenne, French Guiana, experiences a UV Index of 12, categorized as extreme, with a burn time of just 10 minutes. This marks a slight decline from the peak values observed from February to April, where the index reached 16. The overall trend throughout the year indicates consistently high UV levels, requiring caution and protection during outdoor activities. It's essential for residents and visitors alike to stay informed and take necessary precautions, particularly in the intense sun of the tropics. For more detailed information, visit Cayenne UV Index.
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In Cayenne, French Guiana, December marks a transition as the year winds down, offering 282 hours of sunshine. While this is a noticeable dip from the sun-soaked peak of 346 hours in August, it still reflects the city's overall vibrant climate. The trend of gradually increasing sunlight during the early months culminates in a radiant July, with sunshine hours consistently rising until August, then gently tapering off into the final months of the year. December's warmth provides a soothing backdrop for the holiday season, reminding residents and visitors alike of the enduring tropical charm that characterizes this enchanting locale.
In Cayenne, French Guiana, December marks a notable dip in sunshine, with only an 8% chance of sunny weather, making it one of the least favorable months for sun-seekers. This decline follows a trend observed over the year, where the likelihood of clear skies peaks in the mid to late months, particularly in August and September with chances soaring to 41% and 45%, respectively. As the year progresses, the sunshine probabilities generally fluctuate, but December’s low percentage signifies the onset of the wet season, contrasting sharply with the sun-drenched summer months. Travelers looking for brighter days may want to plan their visit for earlier in the year when sunny weather is more promising.
In Cayenne, French Guiana, the daylight duration exhibits a comforting consistency throughout the year. From January to February, the sun graces the skies for 11 hours, creating a warm and inviting atmosphere. As spring approaches, the days stretch slightly longer, peaking at 12 hours from March to September, allowing for ample time to relish the vibrant outdoor life. However, as October rolls in, a gradual shift occurs, and the daylight begins to recede once more, settling back to 11 hours in November and December. This subtle rhythm of daylight not only mirrors the tropical climate but also sets a lively tone for the festive season at year’s end.
In Cayenne, French Guiana, the December winds bring a refreshing change, with an average speed of 4.4 m/s (10 mph), offering a gentle reminder of the transition towards the cooler months. Throughout the year, the wind speeds show a clear trend: they begin robustly in January and February, peaking at 6.0 m/s (14 mph), before gradually softening as spring approaches. The winds hit their lowest point in the summer months of July and August, dipping to around 2.8 m/s (6 mph). As December rolls in, there is a noticeable uptick from the lowest summer records, hinting at a slight revival as the year wraps up. This seasonal ebb and flow create a unique dynamic in Cayenne's weather, making December a pleasantly breezy time to experience the beauty of French Guiana.
Weather in Cayenne varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Cayenne, focusing on differences in temperature, rainfall, humidity, and UV levels.
The weather in December tends to be warmer and wetter compared to January. In December, temperatures range from a minimum of 24°C (75°F) to a maximum of 30°C (86°F), with an average of 26°C (79°F). Notably, December experiences significant rainfall, with precipitation of 349 mm (13.7 in) over 29 days, resulting in high humidity levels around 84%.
In contrast, January sees slightly cooler conditions with temperatures ranging from a minimum of 23°C (74°F) to a maximum of 29°C (84°F), while maintaining the same average of 26°C (79°F). Precipitation decreases to 225 mm (8.9 in) over just 23 days, and humidity drops to 78%. For more details, you can view the specifics of the weather in January at Cayenne weather in January.
In December, the weather is characterized by warm temperatures, with a minimum of 24°C (75°F) and an average of 26°C (79°F), reaching a maximum of 30°C (86°F). However, this month is marked by high precipitation levels, totaling 349 mm (13.7 in) over 29 days, and humidity is notably high at 84%.
In contrast, February maintains similar temperatures, with a minimum of 24°C (75°F) and an average of 26°C (79°F), but peaks at a slightly lower maximum of 28°C (83°F). Precipitation is significantly reduced to 189 mm (7.5 in) across 24 days, and humidity levels drop to a more comfortable 76%. For a detailed overview of February weather, you can visit Cayenne weather in February.
In comparing the weather between December and March, both months feature similar temperature ranges, with minimums of 24°C (75°F), averages around 26°C (79°F-80°F), and maximums peaking at 30°C (86°F). However, December experiences significantly higher precipitation levels, totaling 349 mm (13.7 in) over 29 days, compared to March's 196 mm (7.7 in) across 25 days. Additionally, December's humidity remains higher at 84%, while March sees a drop to 76%. For more details, you can check out Cayenne weather in March.
In comparing the weather between December and April, both months exhibit warm temperatures, with minimums around 24°C (75°F) and averages close to 26°C (79°F in December, 80°F in April). However, the maximum temperatures in December reach up to 30°C (86°F), while April sees a slightly lower maximum of 29°C (85°F). Precipitation is notably high in both months; December receives 349 mm (13.7 in) over 29 days, while April records 390 mm (15.4 in) across 27 days, suggesting that April may experience slightly more intense rainfall. Additionally, humidity levels are higher in December at 84%, compared to April's 77%. For more detailed insights into the weather in April, you can visit Cayenne weather in April.
When comparing the weather in December to that of May, both months exhibit similar temperature patterns with minimums around 24°C (75°F), averages of 26°C (79°F), and maximums reaching 30°C (86°F). However, May tends to be wetter, with 576 mm (22.7 in) of precipitation over 30 days compared to December's 349 mm (13.7 in) across 29 days. Additionally, humidity levels are slightly lower in May at 78%, compared to December's higher average of 84%. For more details on Cayenne's weather during May, you can visit Cayenne weather in May.
In comparing the weather between December and June, both months share similar temperature ranges, with minimums at 24°C (75°F), averages at 26°C (79°F), and maximums reaching 30°C (86°F). However, June experiences a higher level of precipitation, totaling 433 mm (17.1 in) compared to December's 349 mm (13.7 in). Both months also exhibit considerable rainfall days, with 29 days of precipitation recorded in each; nonetheless, June's humidity slightly edges out December at 87% compared to 84%. For a more detailed look, you can check out Cayenne weather in June.
When comparing the weather between December and July, both months present a similar temperature range, with minimums around 24°C (75°F), averages of 26°C (79°F for December and 80°F for July), and maximums peaking at 30°C (86°F in December and 87°F in July). However, December experiences significantly higher precipitation, totaling 349 mm (13.7 in), compared to July's 269 mm (10.6 in), both over 29 days. Additionally, December boasts a higher humidity level at 84%, while July has a slightly lower humidity at 81%. For more detailed insights, you can check this link: Cayenne weather in July.
In December, the weather is warm with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 30°C (86°F), accompanied by high humidity levels at 84%. The month also sees significant rainfall, with about 349 mm (13.7 in) spread over 29 days, making it a notably wet period. In contrast, August features slightly warmer average temperatures, peaking at 32°C (89°F), but with less humidity at 80% and substantially lower precipitation of 92 mm (3.6 in) over 18 days. For more details on the conditions during this month, check out Cayenne weather in August.
In December, the weather is characterized by slightly cooler temperatures, with a minimum of 24°C (75°F) and an average of 26°C (79°F), compared to September, which sees a higher average temperature of 28°C (82°F) and a maximum of 32°C (90°F). Additionally, December experiences significantly more rainfall, registering 349 mm (13.7 in) over 29 days, while September boasts only 56 mm (2.2 in) across 12 days. Humidity levels also remain high in both months, with December at 84% and September at 79%. For more detailed information about the September weather, you can check Cayenne weather in September.
December weather features slightly cooler temperatures with an average of 26°C (79°F), compared to October's warmer average of 28°C (82°F). While October has a maximum temperature reaching up to 32°C (90°F), December's maximum is a bit lower at 30°C (86°F). One of the most notable differences is the precipitation; December brings significantly more rain with 349 mm (13.7 in) over 29 days, whereas October sees much less with only 59 mm (2.3 in) across 16 days. Humidity levels are relatively high in both months, but December edges slightly higher at 84% compared to October's 80%. For a closer look at October weather patterns, visit Cayenne weather in October.
In comparing the weather between December and November, both months experience warm temperatures with minimal variation. December's average temperature is slightly lower at 26°C (79°F), compared to November's 27°C (81°F). While the minimum temperatures remain constant at around 24°C (75°F), December tends to have a slightly cooler maximum temperature of 30°C (86°F) compared to November’s 31°C (88°F). Precipitation levels also rise dramatically in December, with 349 mm (13.7 in) of rain over 29 days, compared to November's 204 mm (8.0 in) over 24 days. The humidity remains high in both months, with December at 84% and November at 85%. For a more detailed look at November weather, you can visit Cayenne weather in November.
In December, Cayenne experiences a unique blend of warm temperatures and high humidity that sets it apart from other months. With an average temperature hovering around 26°C (79°F), it offers a pleasant contrast to the cooler months earlier in the year. However, this month is characterized by an abundant 349 mm (13.7 in) of rainfall spread across 29 days, making it one of the wettest times to visit. The high humidity level of 84% adds to the tropical feel, creating a vibrant atmosphere enveloped in lush greenery. For those who thrive in warm, rainy climates, December presents a captivating experience in this stunning region. To learn more about how Cayenne's weather stacks up throughout the year, visit Cayenne Climate.