Cayenne weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Fair
Best time to visit: January – March, September – October
What is the weather like in Cayenne in August?
In August, Cayenne is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. The sea averages 28.3 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 18 days, totalling 124 mm. On about 19 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a so-so month for a holiday in Cayenne.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 49 | 46 | 57 |
| Day | 29° | 30° | 32° |
| Night | 23° | 24° | 24° |
| Sea | 28° | 28° | 28° |
| Sun | 7 h | 8 h | 8 h |
| Rain days | 27 | 18 | 10 |
More details for August
- Daylight
- 12 h 17 min06:26 – 18:43
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 49 %on averageAll months
- Hot days
- 19 days30 °C or moreAll months
- Time zone
- UTC−3America/Cayenne
How the score comes together
- Temperatureweight 50 %60 %
- Sunshineweight 20 %77 %
- Few rainy daysweight 30 %2 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Cayenne in August: quick answers
Is Cayenne hot in August?
Yes. In August, Cayenne is hot: daytime highs average 30 °C and nights stay around 24 °C. On about 19 days the thermometer climbs to 30 °C or more.
Can you swim in Cayenne in August?
Yes. In August the sea averages 28.3 °C – lovely and warm for swimming.
Does it rain much in Cayenne in August?
It rains often – on about 18 days, adding up to 124 mm.
Cayenne month by month
The whole year in CayenneAll destinations: French GuianaWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences