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September Weather in Chaves, Portugal

Last updated: August 27, 2025

In September, the average temperature in Chaves, Portugal is a pleasant 18°C (65°F). Expect a minimum chill of 4°C (40°F) and the occasional high of 32°C (89°F). During this period, 30 mm (1.2 in) of precipitation typically falls over 5 days, contributing to an average humidity of 71%. 🌦️

September Temperature in Chaves

In September in Chaves, the average temperature is 18°C (65°F). The maximum can reach 32°C (89°F), and the minimum can be as low as 4°C (40°F). This makes it an ideal time for travelers to enjoy a mix of warm days and cool evenings while exploring the area.

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

The chart illustrates September temperature patterns in Chaves, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chaves, September typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (89°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec424648525964696964574845
Data source: Temperature data for Chaves generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Chaves

In Chaves in September, the precipitation amount is 30 mm (1.2 in) over the course of 5 days.

September Precipitation Trends in Chaves

The chart displays monthly precipitation patterns in Chaves, 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 Chaves, September typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec4387909049391915307180114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chaves

In Chaves in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.

September Average Humidity in Chaves

This chart illustrates the average monthly humidity levels in Chaves, 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 Chaves is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%81%78%79%78%71%63%64%71%79%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chaves

In Chaves in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Chaves.

Maximum UV Index Levels in Chaves for September

The chart shows the monthly maximum UV Index (UVI) for Chaves 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 Chaves typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246910111098642
Data source: Chaves 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 Chaves Compares to Other Months

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

This table compares monthly weather conditions in Chaves, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)43 mm (1.7 inches)87%low
February Weather8°C (46°F)87 mm (3.4 inches)81%moderate
March Weather9°C (48°F)90 mm (3.5 inches)78%high
April Weather11°C (52°F)90 mm (3.5 inches)79%very high
May Weather15°C (59°F)49 mm (1.9 inches)78%very high
June Weather18°C (64°F)39 mm (1.5 inches)71%extreme
July Weather21°C (69°F)19 mm (0.8 inches)63%very high
August Weather20°C (69°F)15 mm (0.6 inches)64%very high
September Weather18°C (65°F)30 mm (1.2 inches)71%very high
October Weather14°C (57°F)71 mm (2.8 inches)79%high
November Weather9°C (48°F)80 mm (3.2 inches)86%moderate
December Weather7°C (45°F)114 mm (4.5 inches)87%low

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