September weather forecast
San Sebastián Tlacolula, Mexico

September, the first month of the autumn in San Sebastián Tlacolula, is still a tropical month, with temperature in the range of an average low of 21.1°C (70°F) and an average high of 30.8°C (87.4°F).

Temperature

In September, San Sebastián Tlacolula experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 31.8°C (89.2°F) in August to a still tropical 30.8°C (87.4°F). In September, the nighttime temperature lowers to an average of 21.1°C (70°F).

Heat index

The heat index for September is appraised at a blisteringly hot 41°C (105.8°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

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

Rainfall

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

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of the month, sunrise is at 6:13 am and sunset at 6:40 pm. On the last day of September, sunrise is at 6:17 am and sunset at 6:16 pm CST.

Sunshine

In San Sebastián Tlacolula, the average sunshine in September is 8.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In September, a regular UV index of 6 translates into these guidelines:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.