October weather forecast
Ribeirão Preto, Brazil

As the weather shifts from September to October in Ribeirão Preto, the city experiences a substantial increase in rainfall, from 45mm (1.77") to 136mm (5.35"). The number of rainy days and relative humidity also surge, reminiscent of the wet season's return. Concurrently, the city observes an uptick in average high and low temperatures, marking the continuation of the warming trend. Despite the return of frequent rains, daylight and sunshine hours remain consistent, ensuring ample sunlight during the day.

Temperature

Ribeirão Preto marks the arrival of October with an average high-temperature of a still tropical 30.5°C (86.9°F), hardly different from September's 31.1°C (88°F). Throughout October, an average low-temperature of 19.5°C (67.1°F) is experienced.

Heat index

The heat index for October is evaluated at a sweltering 35°C (95°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', melds the effects of warmth and moisture to generate a feeling of heat. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely significant for babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

In Ribeirão Preto, Brazil, the average relative humidity in October is 67%.

Rainfall

In Ribeirão Preto, Brazil, in October, during 20.3 rainfall days, 136mm (5.35") of precipitation is typically accumulated. In Ribeirão Preto, during the entire year, the rain falls for 221 days and collects up to 1294mm (50.94") of precipitation.

Daylight

The average length of the day in October is 12h and 35min.
On the first day of October in Ribeirão Preto, sunrise is at 05:51 and sunset at 18:09. On the last day of the month, sunrise is at 05:28 and sunset at 18:21 -03.

Sunshine

In October, the average sunshine is 8.9h.

UV index

The months with the highest UV index are January, March, July through November, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In October, a daily maximum UV index of 6 leads to the following instructions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.