September weather forecast
San Juan Petlapa, Mexico

The first month of the autumn, September, is also a hot month in San Juan Petlapa, Mexico, with an average temperature varying between 21.1°C (70°F) and 30.8°C (87.4°F).

Temperature

September's arrival registers an average high-temperature of a still hot 30.8°C (87.4°F), closely aligning with the temperature of the previous month. In San Juan Petlapa, an average low-temperature of 21.1°C (70°F) is recorded during September nights.

Heat index

September's average heat index is evaluated at a scorching 41°C (105.8°F). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

January, September, November and December, with an average relative humidity of 83%, are the most humid months in San Juan Petlapa.

Rainfall

In San Juan Petlapa, in September, during 25.5 rainfall days, 130mm (5.12") of precipitation is typically accumulated. Throughout the year, there are 209 rainfall days, and 998mm (39.29") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:37 pm. On the last day of September, in San Juan Petlapa, sunrise is at 6:14 am and sunset at 6:13 pm CST.

Sunshine

The average sunshine in September in San Juan Petlapa is 8.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 6 in September translates into the following instructions:
Fend off overexposure. Sun protection is vital. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.