Cayenne Weather in September

September in Cayenne brings very high temperatures, with highs of 32°C (90°F) and nights dropping to 24°C (75°F). It's also the driest month of the year, ideal for those who want to avoid rain.

Rainfall in Cayenne in September

As the driest month, it's a great time for hiking and exploring the area. Typically, you can expect about 5 days of rain this month, with 65 mm (2.6 in) on average. Although rain is not especially frequent, individual showers can still be quite heavy.

Temperature in Cayenne in September

September in Cayenne brings very high temperatures, with highs of 32°C (90°F) and nights around 24°C (75°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. At 24°C (75°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.

Sunshine in Cayenne in September

Enjoy a sunny month with about 255 hours of sunshine, the clear skies make Cayenne even more beautiful.

Wind Speed in Cayenne in September

Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.

Average water temperature in September

The water temperature is 28°C (82°F), which most people find very comfortable. A good month for swimming and water sports.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. September typically offers the best weather for Cayenne.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit French Guiana, check out our Cayenne's climate page.

Cayenne Temperature in September

Min Temperature 24°C (75°F)  

Max Temperature 32°C (90°F)  

Water Temperature 28°C (82°F)  

Chance of Rain 15%  

Precipitation 65 mm (2.6 in)  

Rainy days 5 days  

Humidity 71%  

Windspeed 3 m/s (6 knots)  

Sunshine 255 hours  

Percentage Sunshine  

Daily Historical Temperatures

46-year average (1976-2025)

Based on our historical records, temperatures in Cayenne typically stay consistent throughout September, with daily highs averaging around 32°C (90°F). Nights are warm, with lows around 23°C (73°F).

Average temperatures in September

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Daily Historical Precipitation

46-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Cayenne in September

Browse day-by-day weather records for Cayenne spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Cayenne historical weather extremes in September

Based on 33 years of weather observations in Cayenne between 1992 and 2025, these are the recorded extremes.

• The warmest day in September was on September 12, 1995, with a maximum of 36°C (97°F).
• On September 26, 1999, Cayenne saw its coldest September day with temperatures maxing out at 26°C (79°F).
• Cayenne registered its coldest September night on September 11, 1997, with temperatures dropping to 20°C (68°F).

What to Wear in Cayenne in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Rain is likely on several days, so bring a good rain jacket. With water temperatures around 28°C (82°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Cayenne in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

8/10

Walking

8/10

Camping

8/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit French Guiana, check out our Cayenne's climate page.

More climate data for Cayenne

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Cayenne climate overview or explore weather in French Guiana.