September weather forecast
Chichén Itzá, Mexico

September, the first month of the autumn in Chichén Itzá, is still a hot month, with temperature in the range of an average high of 33.2°C (91.8°F) and an average low of 22.5°C (72.5°F).

Temperature

September's onset records a minor alteration in the average high-temperature to a still hot 33.2°C (91.8°F) from August's 34.5°C (94.1°F). Chichén Itzá's temperature drops to an average low of 22.5°C (72.5°F) during the nights of September.

Heat index

The heat index for September is computed to be a blazing hot 50°C (122°F). Stay vigilant: Heat cramps along with heat exhaustion are expected. Heatstroke may follow prolonged exertion.
The heat index's values are generally associated with conditions in shade and light breezes. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', represents the fusion of temperature and moisture in the air to suggest how warm it feels. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely significant for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

September and October, with an average relative humidity of 82%, are the most humid months.

Rainfall

In Chichén Itzá, during September, the rain falls for 23.8 days and regularly aggregates up to 67mm (2.64") of precipitation. Throughout the year, there are 195.8 rainfall days, and 599mm (23.58") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 15min.
On the first day of the month, sunrise is at 5:38 am and sunset at 6:09 pm. On the last day of September, in Chichén Itzá, sunrise is at 5:45 am and sunset at 5:42 pm CST.

Sunshine

In September, the average sunshine in Chichén Itzá is 7.9h.

UV index

The months with the highest UV index in Chichén Itzá are March through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.