September Weather in Viseu, Brazil

Last updated: August 22, 2025

In Viseu, Brazil, the average temperature in September hovers around 27°C (81°F), offering a comfortable climate for outdoor activities. Expect minimums of 22°C (72°F) and maximums reaching 33°C (91°F). While the weather is generally warm, be prepared for some moisture, with an average precipitation of 43 mm (1.7 in) spread over 13 days. Humidity levels linger at a notable 78%, adding a touch of tropical feel to your experience!

September Temperature in Viseu

In September in Viseu, the average temperature is 27°C (81°F). The maximum can reach 33°C (91°F), while the minimum can dip to as low as 22°C (72°F). This climate makes Viseu an ideal destination for travelers seeking warm and pleasant weather during this time of year.

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

The chart illustrates September temperature patterns in Viseu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Viseu, September typically has an average temperature of 27°C (81°F), with highs reaching up to 33°C (91°F) and lows dropping to around 22°C (72°F).

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

September Precipitation in Viseu

In Viseu in September, the precipitation amount is 43 mm (1.7 in) over the course of 13 days.

September Precipitation Trends in Viseu

The chart displays monthly precipitation patterns in Viseu, 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 Viseu, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 13 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Viseu

In Viseu in September humidity is 78%. With an average temperature of 27°C (81°F), this humidity feels like a warm, heavy embrace that makes traveling feel both invigorating and exhausting. Moments spent outside can quickly become clammy and uncomfortable, urging travelers to seek shade and hydration as they explore.

September Average Humidity in Viseu

This chart illustrates the average monthly humidity levels in Viseu, 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 Viseu is approximately 78%, 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 Viseu

In Viseu 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 Viseu.

Maximum UV Index Levels in Viseu for September

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

Data source: Viseu 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 Viseu Compares to Other Months

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

This table compares monthly weather conditions in Viseu, 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)	241 mm (9.5 inches)	87%	extreme
February Weather	26°C (79°F)	616 mm (24.3 inches)	84%	extreme
March Weather	26°C (79°F)	602 mm (23.7 inches)	84%	extreme
April Weather	26°C (79°F)	537 mm (21.2 inches)	87%	extreme
May Weather	26°C (80°F)	366 mm (14.4 inches)	87%	extreme
June Weather	26°C (80°F)	197 mm (7.8 inches)	83%	extreme
July Weather	26°C (80°F)	131 mm (5.2 inches)	81%	extreme
August Weather	27°C (80°F)	66 mm (2.6 inches)	79%	extreme
September Weather	27°C (81°F)	43 mm (1.7 inches)	78%	extreme
October Weather	28°C (82°F)	39 mm (1.5 inches)	77%	extreme
November Weather	28°C (82°F)	55 mm (2.2 inches)	78%	extreme
December Weather	27°C (81°F)	130 mm (5.1 inches)	84%	extreme