October weather forecast
Belém, Brazil

In October, the city of Belém steps into the wetter season, with a slight increase in rainfall compared to the previous month. Despite the rise in showers, the weather remains predominantly warm, maintaining the tropical feel, typical of this city. The largely enjoyable tropical weather carries on, despite notable trends towards an increase in downpours. High humidity and consistent heat become a year-round characteristics of this city nestled in the Amazon. As the city prepares for its famed mango harvest season in the later part of the year, it welcomes a slew of food-oriented festivities.

Temperature

The weather during October records an average high-temperature of a still tropical 32.2°C (90°F), closely mirroring the preceding month. Belém's average low-temperature during October nights is observed to be a pleasant 21.6°C (70.9°F).

Heat index

The heat index in October is estimated at a blazing hot 46°C (114.8°F). Forewarned: Heat cramps and heat exhaustion are anticipated. Ongoing physical activity increases the likelihood of heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

October and November, with an average relative humidity of 83%, are the least humid months.

Rainfall

October is the month with the least rainfall. Rain falls for 12 days and accumulates 115mm (4.53") of precipitation.

Sea temperature

The months with the coldest seawater are September, October and December, with an average sea temperature of 28.2°C (82.8°F).
Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

In October, the average length of the day is 12h and 9min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:07. On the last day of October, sunrise is at 05:52 and sunset at 18:02 -03.

Sunshine

In October, the average sunshine in Belém is 7.5h.

UV index

The months with the highest UV index in Belém are January through May, August through December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for average individuals.
Note: In October, the UV index of 12 transforms into the following advice:
Enforce all necessary safety measures, unprotected skin may suffer burns swiftly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Regardless of the cloudiness of the day, a sunscreen with SPF 30 or more should be applied and reapplied generously, specifically after swimming or outdoor exercise. Be alert! The reflection of water and sand augments UV radiation intensity.