October weather forecast
Grand-Santi, French Guiana

October introduces a slight change in the climate of Grand-Santi, highlighted by a decrease in temperature and an evident decrease in daylight hours. The month presents a slight rise in the pressure level, at 1010.1mb, indicating a stable atmospheric condition. The UV Index of 7 emphasizes the need for sun protective measures, despite the reducing daylight hours. Despite the weather trends, rainfall marks a subtle increase to 21mm (0.83") from the preceding month, indicating the beginning of wetter days ahead.

Temperature

October tends to be the warmest month, with temperatures averaging a daily high of 34.8°C (94.6°F) and a low of 21.4°C (70.5°F).

Heat index

The heat index value for October is calculated to be a life-threatening hot 51°C (123.8°F). Mindful: Heat cramps and heat exhaustion are to be expected. Extended physical effort might result in heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', gives a temperature feeling by integrating air temperature and humidity. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

October is the least humid month in Grand-Santi, with an average relative humidity of 73%.

Rainfall

In Grand-Santi, in October, during 11.3 rainfall days, 21mm (0.83") of precipitation is typically accumulated. Throughout the year, in Grand-Santi, French Guiana, there are 259.6 rainfall days, and 915mm (36.02") of precipitation is accumulated.

Daylight

The average length of the day in October in Grand-Santi is 12h and 2min.
On the first day of October, sunrise is at 06:24 and sunset at 18:29. On the last day of the month, sunrise is at 06:21 and sunset at 18:20 -03.

Sunshine

In Grand-Santi, the average sunshine in October is 8.9h.

UV index

July through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily maximum UV index of 7 in October translates into the following instructions:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.