September Weather in Fortuna, Brazil

Last updated: August 22, 2025

In Fortuna, Brazil, the average temperature in September reaches a warm 29°C (85°F), with a minimum of 21°C (69°F) and a maximum soaring up to 38°C (101°F). Expect 7 mm (0.3 in) of precipitation over approximately 1 day, and enjoy an average humidity of 36%, making it a comfortable time to explore!

September Temperature in Fortuna

In September in Fortuna, the average temperature is 29°C (85°F). Maximums can reach 38°C (101°F) and minimums can be as low as 21°C (69°F). It's a great time to visit for those who enjoy warm weather and outdoor activities.

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

The chart illustrates September temperature patterns in Fortuna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fortuna, September typically has an average temperature of 29°C (85°F), with highs reaching up to 38°C (101°F) and lows dropping to around 21°C (69°F).

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

September Precipitation in Fortuna

In Fortuna in September, the precipitation amount is 7 mm (0.3 in) over the course of 1 day.

September Precipitation Trends in Fortuna

The chart displays monthly precipitation patterns in Fortuna, 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 Fortuna, September typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 1 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 Fortuna

In Fortuna in September, humidity is 36%. With an average temperature of 29°C (85°F), this humidity feels like a comfortable warmth that makes traveling enjoyable, allowing you to explore without feeling overheated or sticky.

September Average Humidity in Fortuna

This chart illustrates the average monthly humidity levels in Fortuna, 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 Fortuna is approximately 36%, 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 Fortuna

In Fortuna 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 Fortuna.

Maximum UV Index Levels in Fortuna for September

The chart shows the monthly maximum UV Index (UVI) for Fortuna 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 Fortuna typically reaches 13, which falls under the extreme exposure category.

Data source: Fortuna 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 Fortuna Compares to Other Months

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

This table compares monthly weather conditions in Fortuna, 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 (6.6 inches)	90%	extreme
February Weather	26°C (79°F)	220 mm (8.7 inches)	91%	extreme
March Weather	26°C (78°F)	253 mm (9.9 inches)	92%	extreme
April Weather	26°C (79°F)	169 mm (6.6 inches)	93%	extreme
May Weather	27°C (80°F)	47 mm (1.9 inches)	88%	extreme
June Weather	27°C (81°F)	6 mm (0.2 inches)	75%	extreme
July Weather	27°C (81°F)	4 mm (0.2 inches)	52%	extreme
August Weather	28°C (83°F)	2 mm (0.1 inches)	42%	extreme
September Weather	29°C (85°F)	7 mm (0.3 inches)	36%	extreme
October Weather	29°C (85°F)	32 mm (1.2 inches)	35%	extreme
November Weather	28°C (82°F)	92 mm (3.6 inches)	43%	extreme
December Weather	27°C (81°F)	134 mm (5.3 inches)	76%	extreme