September weather forecast
San José Chiltepec, Mexico

September, the first month of the autumn in San José Chiltepec, is still a tropical month, with an average temperature ranging between max 30.8°C (87.4°F) and min 21.1°C (70°F).

Temperature

The ushering in of September brings an average high-temperature of a still tropical 30.8°C (87.4°F), closely mirroring the 31.8°C (89.2°F) of August. Throughout September, an average low-temperature of 21.1°C (70°F) is expected in San José Chiltepec.

Heat index

The heat index value for September is evaluated at a blistering 41°C (105.8°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

The months with the highest humidity in San José Chiltepec are January, September, November and December, with an average relative humidity of 83%.

Rainfall

In San José Chiltepec, in September, it is raining for 25.5 days, with typically 130mm (5.12") of accumulated precipitation. In San José Chiltepec, Mexico, during the entire year, the rain falls for 209 days and collects up to 998mm (39.29") of precipitation.

Daylight

In San José Chiltepec, 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 6:38 pm. On the last day of September, sunrise is at 6:14 am and sunset at 6:13 pm CST.

Sunshine

In San José Chiltepec, Mexico, the average sunshine in September is 8.6h.

UV index

In San José Chiltepec, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index, 6 during September, leads to the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.