The climate in Cayenne during September can be summarized as hot, humid and reasonably dry.
September is in the fall / autumn in Cayenne and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a steamy 32°C (90°F), whilst at night 23°C (73°F) is normal.
|Daytime temperature||32.3°C 90.1°F|
|Nightly temperature||22.7°C 72.9°F|
|Average temperature||27.5°C 81.5°F|
|Daily sunshine||8.8 hrs|
|Avg rainfall||41 mm 1.6 ins|
|Rainy days||4 days|
|Sea temperature||28.3°C 82.9°F|
|Windspeed||6.1kph 4 mph|
On average September is the driest month of the year in Cayenne with around 41mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.8 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in September 2019.
|Hottest month:||September||32.1°C 89.8°F|
|Driest month:||September||41mm 1.6ins|
|Coldest month:||January||28.6°C 83.5°F|
|Wettest month:||May||544mm 21.4ins|