Cayenne weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: January – March, September – October
What is the weather like in Cayenne in September?
In September, Cayenne is hot: daytime highs average 32 °C, and even at night it stays warm at around 24 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 48 mm in total. On about 28 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Cayenne.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 46 | 57 | 52 |
| Day | 30° | 32° | 32° |
| Night | 24° | 24° | 25° |
| Sea | 28° | 28° | 28° |
| Sun | 8 h | 8 h | 8 h |
| Rain days | 18 | 10 | 11 |
More details for September
- Daylight
- 12 h 9 min06:20 – 18:29
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 42 %on averageAll months
- Hot days
- 28 days30 °C or moreAll months
- Time zone
- UTC−3America/Cayenne
How the score comes together
- Temperatureweight 50 %44 %
- Sunshineweight 20 %87 %
- Few rainy daysweight 30 %61 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Cayenne in September: quick answers
Is Cayenne hot in September?
Yes. In September, Cayenne is hot: daytime highs average 32 °C and nights stay around 24 °C. On about 28 days the thermometer climbs to 30 °C or more.
Can you swim in Cayenne in September?
Yes. In September the sea averages 28.2 °C – lovely and warm for swimming.
Does it rain much in Cayenne in September?
Rain is frequent, with about 10 rainy days and 48 mm in total.
Cayenne month by month
The whole year in CayenneAll destinations: French GuianaWhere to go in SeptemberSea temperature in September
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