October weather forecast
Brazil

October ushers in the spring season in Brazil, with the northern and Amazon Basin regions experiencing a steady rise in temperatures, frequently reaching above 30°C (86°F) during the day. The nights turn progressively warmer, indicating the complete withdrawal of the winter season.

In the coastal cities, including Rio de Janeiro, the temperature continues to rise modestly, ranging from 22.8°C (73°F) to 27.2°C (81°F). The warming sea temperatures along the north-central coast make for enjoyable coastal activities and create favourable conditions for marine wildlife, marking a period of vibrant sea life.

In the south, temperatures continue to rise, with October offering a pleasant spring climate. The regions south of the Tropic of Capricorn witness a significant increase in temperatures, marking a clear transition from the cold winters to the mild spring season. The frost and snowfall that characterised the highlands and mountains during winter are completely absent by October.

With respect to rainfall, October sees the onset of the wet season in many parts of Brazil. The Amazon region receives substantial rainfall, although still lower than its peak levels. The northeastern regions receive increased rainfall, which helps replenish the water sources after the extended dry spell. Rainfall continues to increase across Brazil in October, setting the stage for the peak wet season that characterises the ensuing months.

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• São Paulo - October »
  On the first day of October in São Paulo sunrise is at 05:46 and sunset at 18:05. In São Paulo during October, the rain falls for 10 days and regularly aggregates up to 127mm (5") of precipitation.
• Rio de Janeiro - October »
  In Rio de Janeiro in October, the average water temperature is 22.7°C (72.9°F). In Rio de Janeiro in October, during 18.3 rainfall days, 67mm (2.64") of precipitation is typically accumulated.
• Brasília - October »
  The weather in October in Brasília, Brazil shares its similarities with September, but with rainfall increasing noticeably from 19mm (0.75") to 166mm (6.54"). In Brasília, in October, during 19.8 rainfall days, 166mm (6.54") of precipitation is typically accumulated.
• Salvador - October »
  Shifting into October, Salvador records an average high-temperature of a still warm 28.1°C (82.6°F), presenting minor fluctuations compared to the previous month. In Salvador the average seawater temperature in October is 26.3°C (79.3°F).
• Fortaleza - October »
  As September transitions into October, Fortaleza records an average high-temperature of a still hot 30.5°C (86.9°F), showing a gentle shift from the preceding month. In October, the average sea temperature in Fortaleza is 26.8°C (80.2°F).
• Belo Horizonte - October »
  January through March, October through December, with an average maximum UV index of 12, are months with the highest UV index in Belo Horizonte, Brazil. January through March, October through December, with an average maximum UV index of 12, are months with the highest UV index in Belo Horizonte, Brazil.
• Manaus - October »
  In October, the average heat index, which factors the actual air temperature with the relative humidity, is evaluated at 47°C (116.6°F). On the last day of October, in Manaus, sunrise is at 05:37 and sunset at 17:50 -04.
• Curitiba - October »
  October in Curitiba brings a mixed bag of climatic conditions - moderate temperatures, longer daylight hours, and an increase in rainfall. In Curitiba in October, during 10 rainfall days, 133mm (5.24") of precipitation is typically accumulated.
• Recife - October »
  On the first day of October in Recife, sunrise is at 05:03 and sunset at 17:14. In Recife, in October, it is raining for 9 days, with typically 63mm (2.48") of accumulated precipitation.
• Porto Alegre - October »
  In Porto Alegre the average seawater temperature in October is 18.9°C (66°F). In Porto Alegre, in October, the average water temperature is 18.9°C (66°F).
• Goiânia - October »
  The average heat index, which combines air temperature and relative humidity, in October is appraised at 36°C (96.8°F). In October, the average relative humidity in Goiânia is 65%.
• Guarulhos - October »
  On the first day of October in Guarulhos, sunrise is at 05:46 and sunset at 18:05. In October, in Guarulhos, Brazil, the rain falls for 10 days.