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September Weather in Castelo, Brazil

Last updated: August 22, 2025

In Castelo, Brazil, the average temperature in September is a pleasant 21°C (70°F), with a minimum of 10°C (51°F) and a maximum reaching 35°C (95°F). Expect a bit of rain, as precipitation amounts reach about 50 mm (2.0 in) over 7 days. Plus, with an average humidity of 72%, you'll find it comfortably warm and inviting.

September Temperature in Castelo

In September in Castelo, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as 10°C (51°F). This makes Castelo an ideal destination for travelers seeking a pleasant climate.

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

The chart illustrates September temperature patterns in Castelo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelo, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec767574716766646570727173
Data source: Temperature data for Castelo 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 Castelo

In Castelo in September, the precipitation amount is 50 mm (2.0 in) over a span of 7 days.

September Precipitation Trends in Castelo

The chart displays monthly precipitation patterns in Castelo, 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 Castelo, September typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec86176131764624183350114167175
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Castelo

In Castelo in September, humidity is 72%. With an average temperature of 21°C (70°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities a bit sticky and sweaty, but still manageable for traveling if you stay hydrated and take regular breaks in the shade.

September Average Humidity in Castelo

This chart illustrates the average monthly humidity levels in Castelo, 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 Castelo is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%85%86%85%82%81%79%75%72%67%69%72%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Castelo

In Castelo in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Castelo.

Maximum UV Index Levels in Castelo for September

The chart shows the monthly maximum UV Index (UVI) for Castelo 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 Castelo typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161514129781012141516
Data source: Castelo 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 Castelo Compares to Other Months

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

This table compares monthly weather conditions in Castelo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)86 mm (3.4 inches)80%extreme
February Weather24°C (75°F)176 mm (6.9 inches)85%extreme
March Weather23°C (74°F)131 mm (5.1 inches)86%extreme
April Weather22°C (71°F)76 mm (3.0 inches)85%extreme
May Weather20°C (68°F)46 mm (1.8 inches)82%very high
June Weather19°C (67°F)24 mm (1.0 inches)81%high
July Weather18°C (64°F)18 mm (0.7 inches)79%very high
August Weather18°C (65°F)33 mm (1.3 inches)75%very high
September Weather21°C (70°F)50 mm (2.0 inches)72%extreme
October Weather22°C (72°F)114 mm (4.5 inches)66%extreme
November Weather22°C (71°F)167 mm (6.6 inches)69%extreme
December Weather23°C (74°F)175 mm (6.9 inches)72%extreme

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