Monthly climate guide
Cayenne weather in September
September in Cayenne is typically hot, with average daytime highs around 29°C (84°F) and night-time lows near 25°C (77°F). The month usually brings about 62 mm of rain (some rain) and is a mix of sun and cloud. Daytime highs are about the same as August and about the same as October.
What stands out in September
- September is Cayenne's third warmest month.
- Days and nights are close, only about 4°C apart.
- It's one of the drier months, with about 74% less rain than Cayenne's average.
- September sits in Cayenne's drier season — usually a comfortable time to visit.
It's usually the driest month of the year.
Avg high
29°C
84°F
Avg low
25°C
77°F
Rainfall
62 mm
some rain
Humidity
83%
relative
Sky
36%
cloud · a mix of sun and cloud
Cayenne weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 28°C / 82°F | 24°C / 76°F | 251 mm | 85% | 71% |
| February | 28°C / 82°F | 24°C / 76°F | 292 mm | 85% | 80% |
| March | 28°C / 83°F | 25°C / 76°F | 242 mm | 83% | 72% |
| April | 28°C / 83°F | 25°C / 77°F | 333 mm | 85% | 77% |
| May | 28°C / 82°F | 25°C / 77°F | 541 mm | 89% | 81% |
| June | 28°C / 82°F | 25°C / 77°F | 315 mm | 88% | 70% |
| July | 28°C / 83°F | 25°C / 76°F | 223 mm | 87% | 57% |
| August | 29°C / 83°F | 25°C / 76°F | 118 mm | 85% | 43% |
| September | 29°C / 84°F | 25°C / 77°F | 62 mm | 83% | 36% |
| October | 30°C / 86°F | 25°C / 78°F | 62 mm | 80% | 44% |
| November | 30°C / 85°F | 25°C / 78°F | 125 mm | 82% | 58% |
| December | 28°C / 83°F | 25°C / 77°F | 297 mm | 85% | 70% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A small travel umbrella, just in case
- Sunglasses
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is September a good time to visit Cayenne?
Compare the months in the chart above to find your ideal window.
Best time to visit Cayenne →Cite or embed this data
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Cayenne weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/french-guiana/cayenne/september
<a href="https://weathercompare.eu/weather/french-guiana/cayenne/september">Cayenne weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/french-guiana/cayenne" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Cayenne weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/french-guiana/cayenne/september">Cayenne weather in September</a> – WeatherCompare</p>
Cayenne in September: quick answers
Is September a good time to visit Cayenne?
Yes. September is one of the best months for Cayenne, with highs around 29°C and about 62 mm of rain.
How warm is Cayenne in September?
Average highs are about 29°C (84°F) and average lows about 25°C (77°F), based on 10 years of daily data.
Does it rain a lot in Cayenne in September?
Cayenne typically gets around 62 mm of rain in September — some rain. It's usually the driest month of the year.
Figures are long-term averages for the area around Cayenne (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.