September weather forecast
Petacalco, Mexico

September, the first month of the autumn in Petacalco, is still a hot month, with temperature in the range of an average low of 24.3°C (75.7°F) and an average high of 30.6°C (87.1°F).

Temperature

Petacalco signifies an average high-temperature of a still hot 30.6°C (87.1°F) in September, closely mirroring the 31.8°C (89.2°F) of August. In Petacalco, the average low-temperature during the month of September is a warm 24.3°C (75.7°F).

Heat index

During September, the heat index is estimated at a very hot 39°C (102.2°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gauges the sensation of temperature factoring in the air's moisture content. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In Petacalco, Mexico, the average relative humidity in September is 77%.

Rainfall

In September, the rain falls for 14.5 days. Throughout September, 86mm (3.39") of precipitation is accumulated. Throughout the year, in Petacalco, there are 78.8 rainfall days, and 363mm (14.29") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of the month, sunrise is at 6:34 am and sunset at 7:02 pm. On the last day of September, sunrise is at 6:38 am and sunset at 6:37 pm CST.

Sunshine

September has the least sunshine of the year, with an average of 9h of sunshine.

UV index

The months with the highest UV index in Petacalco are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 7 suggests this advice:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.