September Weather in Orleans, Brazil

Last updated: August 22, 2025

In September, the average temperature in Orleans, Brazil is a pleasant 18°C (65°F). Visitors can expect a range where the minimum dips to 6°C (42°F) and peaks at a warm 33°C (93°F). With 147 mm (5.8 in) of precipitation spread over 15 days, it's wise to prepare for some rain. The air tends to be quite humid, with an average humidity of 86%, making it feel even warmer.

September Temperature in Orleans

In September in Orleans, the average temperature is 18°C (65°F). The maximum can reach 33°C (93°F), while the minimum can be as low as 6°C (42°F). Be sure to pack for both warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Orleans, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Orleans, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (93°F) and lows dropping to around 6°C (42°F).

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

September Precipitation in Orleans

In Orleans in September, the precipitation amount is 147 mm (5.8 in) over a span of 15 days.

September Precipitation Trends in Orleans

The chart displays monthly precipitation patterns in Orleans, 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 Orleans, September typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 15 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 Orleans

In Orleans in September humidity is 86%. With an average temperature of 18°C (65°F), this humidity feels like you’re wrapped in a warm, heavy blanket, making outdoor activities feel quite muggy and sticky for traveling.

September Average Humidity in Orleans

This chart illustrates the average monthly humidity levels in Orleans, 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 Orleans is approximately 86%, 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 Orleans

In Orleans in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Orleans.

Maximum UV Index Levels in Orleans for September

The chart shows the monthly maximum UV Index (UVI) for Orleans 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 Orleans typically reaches 10, which falls under the very high exposure category.

Data source: Orleans 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 Orleans Compares to Other Months

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

This table compares monthly weather conditions in Orleans, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	273 mm (10.7 inches)	85%	extreme
February Weather	23°C (73°F)	198 mm (7.8 inches)	84%	extreme
March Weather	22°C (71°F)	192 mm (7.6 inches)	84%	extreme
April Weather	19°C (67°F)	94 mm (3.7 inches)	83%	very high
May Weather	17°C (62°F)	133 mm (5.2 inches)	86%	high
June Weather	15°C (60°F)	138 mm (5.4 inches)	82%	moderate
July Weather	14°C (58°F)	62 mm (2.4 inches)	80%	moderate
August Weather	15°C (60°F)	66 mm (2.6 inches)	81%	high
September Weather	18°C (65°F)	147 mm (5.8 inches)	86%	very high
October Weather	19°C (66°F)	136 mm (5.3 inches)	87%	extreme
November Weather	20°C (68°F)	165 mm (6.5 inches)	87%	extreme
December Weather	22°C (72°F)	231 mm (9.1 inches)	88%	extreme