September weather forecast
Santa Mercedes, Brazil

September, the first month of the spring in Santa Mercedes, is a tropical month, with an average temperature fluctuating between 31.7°C (89.1°F) and 19.1°C (66.4°F).

Temperature

September's weather displays an average high-temperature of a tropical 31.7°C (89.1°F), slightly varied from August's 29.5°C (85.1°F). The September nights in Santa Mercedes bear witness to a significant drop from the daytime highs, settling at an average temperature of 19.1°C (66.4°F).

Heat index

During September, the heat index is calculated to be a torrid 35°C (95°F). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are largely significant for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In Santa Mercedes, the average relative humidity in September is 56%.

Rainfall

In Santa Mercedes, in September, during 8.8 rainfall days, 47mm (1.85") of precipitation is typically accumulated. Throughout the year, in Santa Mercedes, Brazil, there are 189.5 rainfall days, and 1170mm (46.06") of precipitation is accumulated.

Daylight

In Santa Mercedes, the average length of the day in September is 11h and 59min.
On the first day of the month, sunrise is at 06:35 and sunset at 18:18. On the last day of September, sunrise is at 06:08 and sunset at 18:25 -03.

Sunshine

The average sunshine in September in Santa Mercedes is 9.1h.

UV index

In Santa Mercedes, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 6 during September leads to these instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.