September weather forecastOpichén, Mexico

Weather in September

The first month of the autumn, September, is still a tropical month in Opichén, Mexico, with an average temperature varying between 23.3°C (73.9°F) and 33.6°C (92.5°F).

Temperature

September's onset brings an average high-temperature of a hot 33.6°C (92.5°F), showing a minute difference from August's 35°C (95°F). In Opichén, an average low-temperature of 23.3°C (73.9°F) is recorded during September nights.

Heat index

The heat index value for September is appraised at a life-threatening hot 49°C (120.2°F). Note: Heat exhaustion and heat cramps are probable. Heatstroke can follow with prolonged activity.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The months with the highest humidity are September and October, with an average relative humidity of 78%.

Rainfall

In Opichén, Mexico, in September, it is raining for 20.4 days, with typically 70mm (2.76") of accumulated precipitation. In Opichén, during the entire year, the rain falls for 167.3 days and collects up to 536mm (21.1") of precipitation.

Daylight

In September, the average length of the day in Opichén is 12h and 15min.
On the first day of the month, sunrise is at 5:43 am and sunset at 6:14 pm. On the last day of September, sunrise is at 5:50 am and sunset at 5:47 pm CST.

Sunshine

The average sunshine in September is 9.4h.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Deter overexposure. Protecting against the sun's effects is essential. 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. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.