Climate and monthly weather forecastCayenne, French Guiana

The climate of Cayenne

Cayenne, the capital of French Guiana, experiences a Tropical rainforest climate according to the Köppen climate classification (Af). The monthly averages reveal a remarkable consistency in climatic conditions throughout the year, with very little fluctuation in vital parameters.

Temperatures in Cayenne display a narrow band of variation, with the highest average monthly readings oscillating from 29.1°C (84.4°F) to 32.2°C (90°F). In contrast, the lowest average monthly temperatures range narrowly from 22.2°C (72°F) to 23.7°C (74.7°F). Rainfall paints a more variable picture with measurement varying from 56mm (2.2") to a robust 579mm (22.8") monthly average, emphasizing the tropical nature of the region.

Sunny hours vary considerably throughout the year, with impressive 8.5 hours in September, dwindling to a mere 3 hours in January. These weather patterns coincide with an average UV index that often reaches 12, an extreme level, underscoring the need for sun protection in Cayenne.

The best time to visit Cayenne

Careful consideration of weather conditions is vital to ascertain the best time to visit Cayenne. Given the tropical climate and extreme UV levels, periods of lower rainfall and ample sunshine hours could provide the best conditions for a visit. Taking these factors into account, the months from August to October emerge as potentially favourable. During this time, rainfall diminishes considerably to between 56mm (2.2") and 144mm (5.67"), while sunshine increases to between 7.4 hours and 8.5 hours per day.

The worst time to visit Cayenne

The worst time to visit Cayenne would be when climatic conditions are least favourable for outdoor activities. This would be during the months experiencing the most rainfall and lowest amounts of sunshine. Considering these parameters, May stands out, being the wettest month, receiving on an average 579mm (22.8") of rainfall coupled with only 3.8 hours of sunshine.

Spring weather in Cayenne

In Cayenne, observing a traditional spring season as known in temperate regions becomes challenging due to its tropical rainforest climate. However, the months from March to May can be classified as a spring period. During this time, average high temperatures range from 29.6°C (85.3°F) to 29.9°C (85.8°F) and low temperatures between 22.4°C (72.3°F) and 23.7°C (74.7°F). Rainfall takes an upward trend towards May, culminating in an average of 579mm (22.8"), with an accompanying increase in rainy days.

Summer weather in Cayenne

The summer months from June to August in Cayenne signal the advent of slightly warmer temperatures and varied rainfall. Average high temperatures climb gradually to reach between 30.2°C (86.4°F) to 31.6°C (88.9°F). Simultaneously, low temperatures range from 22.4°C (72.3°F) to 22.9°C (73.2°F). Interestingly, despite the increase in temperatures, rainfall appears to diminish over these months, falling from 411mm (16.18") in June to 144mm (5.67") in August.

Autumn weather in Cayenne

September to November is considered the autumn period for Cayenne. During this phase, the region experiences its highest average temperatures, peaking between 31.6°C (88.9°F) and 32.2°C (90°F). Accompanying this rise, rainfall remains on the lower end of the spectrum from 56mm (2.2") to 133mm (5.24"). Hours of daylight start to reduce gradually from an average of 12.1 hours in September to 11.9 hours in November.

Winter weather in Cayenne

Unlike the winter season in colder climates, Cayenne's winter season from December to February is characterized by consistently high temperatures and elevated rainfall. Average high temperatures fluctuate from 30.1°C (86.2°F) to 29.2°C (84.6°F), while average lows oscillate between 22.3°C (72.1°F) to 23.4°C (74.1°F). Alongside these temperatures, rainfall increases from 341mm (13.43") in December to reach 451mm (17.76") in February.

Weather in January

Following the virtue of being the initial month of the year, January in Cayenne, French Guiana, manifests the onset of the wet season. Precipitation rates are high as the atmosphere fills with thunderstorms and steady showers. However, the weather avoids remaining monotonously rainy as the sun reveals itself for some hours per day. Weather in January »

Weather in February

In Cayenne, French Guiana, the weather in February reveals slight shifts in the climate. Hot and rainfall-laden trends from January persist, yet tropical thunderstorms lessen in frequency. The rainfall does not significantly disrupt the sea's temperature, continuing to invite individuals for a warm, relaxing swim. Weather in February »

Weather in March

The weather in March sustains the city’s tropical atmosphere with minimal temperature shifts from February. Although thunderstorms are common, conditions gradually transition away from the earlier high rainfall of the year. Sunbathing becomes more pleasurable as daylight duration expands and the sea’s warm temperature remains steady. Weather in March »

Weather in April

Sense the transition in Cayenne, French Guiana, as April brings some alterations. The sky remains frequently murky, yet the sunlight breaks through often, offering hours of brightness. The sea maintains its warm allure for swimmers and water sports enthusiasts. Weather in April »

Weather in May

Sheltering under an umbrella becomes a common sight as May clocks the highest rainfall for the year in Cayenne, French Guiana. It brings the wet season to its peak with intense rainy spells, although the temperature remains uniformly warm. Weather in May »

Weather in June

Cayenne, French Guiana, sees a decline in June's total rainfall as the wet season gradually recedes. Temperatures stay fairly constant, both on land and in the sea. The atmosphere showcases an intricate dance between thunderstorms and daylight hours. Weather in June »

Weather in July

July utters the first whispers of the dry season in Cayenne, French Guiana. The weather context subtly changes with slightly cooler nights and lengthening daylight hours. Even though episodes of rain persist, their frequency decreases compared to previous months. Weather in July »

Weather in August

In August, Cayenne, French Guiana, steps further into the realm of the dry season. The usually rainfall-rich climate observes exceptional changes. Clear skies, reduced thunderstorms, and increased sunshine hours bring more cheerful outdoors experiences. Weather in August »

Weather in September

September in Cayenne, French Guiana, is synonymous with the driest month. Though temperatures remain consistent, the reduced rainfall significantly changes the city's vibes. People enjoy more outdoor activities as sunshine hours peak and rainfall drops to its annual minimum. Weather in September »

Weather in October

As September’s spell fades, October in Cayenne, French Guiana, ushers in more moisture. Even though increased rainfall graces the city, the heavy downpours from the start of the year remain absent. The periodic showers bring fresher hues to the city's green landscapes. Weather in October »

Weather in November

Come November, frequent showers start to recall the forgotten wet season in Cayenne, French Guiana. The return of rainy days commences a change in seasonal patterns. While daylight starts to decrease slightly, the landscape benefits from a balanced combination of rain and sunshine. Weather in November »

Weather in December

Closing the year, December in Cayenne, French Guiana, revitalizes the city with a tropical festive mood. Wet season blues reoccur with increased rainfall, enveloping the atmosphere with moisture and maintaining fertile ground. Weather in December »