September weather forecast
Akumal, Mexico

September comes with a slight decrease in day and night temperatures, with a slight rise in rainfall incidents in Akumal. The day gets shorter and the weather slightly cooler, signalling the beginning of the retreat from summer. The warm sea continues to be inviting to visitors. It's of interest that September experiences the peak number of rainfall days with 23.5 days, setting a unique late monsoon-like pattern.

Temperature

At the start of September, Akumal's average high-temperature reaches a still tropical 31.3°C (88.3°F), subtly different from the preceding month. Throughout September, the average low-temperature in Akumal dips to a moderately hot 25.8°C (78.4°F).

Heat index

September's mean heat index is evaluated at a blistering 42°C (107.6°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', shows a temperature sensation when both heat and moisture conditions are combined. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In September, the average relative humidity in Akumal is 79%.

Rainfall

In Akumal, Mexico, in September, it is raining for 23.5 days, with typically 110mm (4.33") of accumulated precipitation. Throughout the year, in Akumal, there are 211.1 rainfall days, and 823mm (32.4") of precipitation is accumulated.

Sea temperature

August through October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater.
Note: Between 25°C (77°F) and 29°C (84.2°F), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

The average length of the day in September in Akumal is 12h and 15min.
On the first day of September in Akumal, sunrise is at 6:33 am and sunset at 7:04 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:37 pm EST.

Sunshine

In September, the average sunshine is 8.8h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 7 during September translates into the following guidance:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. 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. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Stay cautious! Sand and water reflections increase UV radiation potency.