September weather forecast
Riviera Maya, Mexico

Rainfall peaks in September in Riviera Maya, making it the wettest month with an average of 145mm (5.71") over 25.2 days. Accompanying the rain is a slight decrease in temperature, which signals the approach of the cooler months. Sunshine still dominates large portions of the day, punctuated by periods of rainfall. Daylight hours are reduced as the season transitions towards the end of the year. As wind speeds continue their descent, they add to the calming nature of the closing days of summer.

Temperature

In Riviera Maya, September's average high-temperature stands at a still tropical 30.5°C (86.9°F), closely related to the preceding month. In Riviera Maya, the month of September brings a consistent average low-temperature of 26.4°C (79.5°F), slightly cooler than its daytime highs.

Heat index

September's heat index is computed to be a very hot 39°C (102.2°F). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', comes about by integrating the temperature readings with the humidity levels. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

In September, the average relative humidity in Riviera Maya is 78%.

Rainfall

In Riviera Maya, Mexico, in September, it is raining for 25.2 days, with typically 145mm (5.71") of accumulated precipitation. In Riviera Maya, Mexico, during the entire year, the rain falls for 227.8 days and collects up to 1036mm (40.79") of precipitation.

Daylight

In Riviera Maya, the average length of the day in September is 12h and 15min.
On the first day of September in Riviera Maya, sunrise is at 6:32 am and sunset at 7:04 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 6:37 pm EST.

Sunshine

In September, the average sunshine is 8.7h.

UV index

February through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 7 during September leads to these instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.