September Weather in Sinnamary, French Guiana

Last updated: August 23, 2025

In September, the average temperature in Sinnamary, French Guiana is a warm 27°C (82°F), with minimums dipping to 25°C (77°F) and maximums reaching up to 30°C (87°F). Expect some rainfall, as 68 mm (2.7 in) of precipitation is spread over approximately 16 days, contributing to an average humidity of 62%.

September Temperature in Sinnamary

In September in Sinnamary, the average temperature is 27°C (82°F), with a maximum that can reach 30°C (87°F) and a minimum that can be as low as 25°C (77°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

September Weather in Sinnamary: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sinnamary, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sinnamary, September typically has an average temperature of 27°C (82°F), with highs reaching up to 30°C (87°F) and lows dropping to around 25°C (77°F).

Data source: Temperature data for Sinnamary generated using information from the Copernicus Climate Change Service.

September Precipitation in Sinnamary

In Sinnamary in September, the precipitation amount is 68 mm (2.7 in) over a span of 16 days.

September Precipitation Trends in Sinnamary

The chart displays monthly precipitation patterns in Sinnamary, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Sinnamary, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Sinnamary

In Sinnamary in September, humidity is 62%. With an average temperature of 27°C (82°F), this humidity feels like a warm embrace, making travel slightly sticky but invigorating, perfect for leisurely strolls along scenic paths or relaxing at outdoor cafes under the shade.

September Average Humidity in Sinnamary

This chart illustrates the average monthly humidity levels in Sinnamary, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Sinnamary is approximately 62%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sinnamary

In Sinnamary in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Sinnamary.

Maximum UV Index Levels in Sinnamary for September

The chart shows the monthly maximum UV Index (UVI) for Sinnamary in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Sinnamary typically reaches 13, which falls under the extreme exposure category.

Data source: Sinnamary September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Sinnamary Compares to Other Months

Weather in Sinnamary varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sinnamary, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sinnamary, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	169 mm (6.7 inches)	70%	extreme
February Weather	26°C (79°F)	135 mm (5.3 inches)	66%	extreme
March Weather	26°C (79°F)	153 mm (6.0 inches)	66%	extreme
April Weather	26°C (80°F)	334 mm (13.2 inches)	66%	extreme
May Weather	26°C (80°F)	475 mm (18.7 inches)	68%	extreme
June Weather	26°C (80°F)	423 mm (16.6 inches)	86%	extreme
July Weather	26°C (80°F)	242 mm (9.5 inches)	76%	extreme
August Weather	27°C (81°F)	103 mm (4.1 inches)	65%	extreme
September Weather	27°C (82°F)	68 mm (2.7 inches)	62%	extreme
October Weather	27°C (82°F)	70 mm (2.8 inches)	63%	extreme
November Weather	27°C (81°F)	202 mm (8.0 inches)	74%	extreme
December Weather	26°C (79°F)	294 mm (11.6 inches)	79%	extreme