September Weather in Viana, Brazil

Last updated: August 22, 2025

In September, the average temperature in Viana, Brazil is a warm 29°C (84°F). Expect a comfortable minimum of 23°C (74°F) and scorching highs of 37°C (98°F). While you enjoy the sunshine, be prepared for a bit of rain, with an average precipitation of 17 mm (0.7 in) over just 2 days. Don't forget, average humidity sits at a pleasant 55%, making it a perfect time to explore!

September Temperature in Viana

In September in Viana, the average temperature is 29°C (84°F). The maximum can reach 37°C (98°F), while the minimum can be as low as 23°C (74°F). Overall, it's an excellent time for travelers seeking warm weather and plenty of sunshine.

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

The chart illustrates September temperature patterns in Viana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Viana, September typically has an average temperature of 29°C (84°F), with highs reaching up to 37°C (98°F) and lows dropping to around 23°C (74°F).

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

September Precipitation in Viana

In Viana in September, the precipitation amount is 17 mm (0.7 in) over a span of 2 days.

September Precipitation Trends in Viana

The chart displays monthly precipitation patterns in Viana, 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 Viana, September typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 2 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 Viana

In Viana in September humidity is 55%. With an average temperature of 29°C (84°F), this humidity feels like a warm, enveloping blanket, making outdoor activities slightly sweaty but still enjoyable for travelers who take breaks in the shade and stay hydrated.

September Average Humidity in Viana

This chart illustrates the average monthly humidity levels in Viana, 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 Viana is approximately 55%, 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 Viana

In Viana 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 Viana.

Maximum UV Index Levels in Viana for September

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

Data source: Viana 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 Viana Compares to Other Months

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

This table compares monthly weather conditions in Viana, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	201 mm (7.9 inches)	92%	extreme
February Weather	27°C (81°F)	336 mm (13.2 inches)	90%	extreme
March Weather	27°C (81°F)	421 mm (16.6 inches)	88%	extreme
April Weather	27°C (81°F)	402 mm (15.8 inches)	93%	extreme
May Weather	28°C (82°F)	185 mm (7.3 inches)	91%	extreme
June Weather	28°C (82°F)	72 mm (2.9 inches)	84%	extreme
July Weather	27°C (82°F)	49 mm (1.9 inches)	74%	extreme
August Weather	28°C (83°F)	19 mm (0.7 inches)	61%	extreme
September Weather	29°C (84°F)	17 mm (0.7 inches)	55%	extreme
October Weather	29°C (84°F)	30 mm (1.2 inches)	56%	extreme
November Weather	29°C (84°F)	68 mm (2.7 inches)	61%	extreme
December Weather	28°C (83°F)	117 mm (4.6 inches)	82%	extreme