September weather forecast
Tulum, Mexico

Visitors to Tulum in September can expect a blend of sun and showers as the month boasts of both high humidity and increased rainfall levels reaching up to 97mm (3.82"). Temperature remains consistent with the previous months, making it ideal for water sports and dips in the sea. The drop in sunshine hours to 9.1 and a slightly higher percentage of cloud cover affect September's weather characteristics. Despite these conditions, sightseeing and other open-air activities can be booked with the assurance of encountering plenty of warm, sunny intervals.

Temperature

In Tulum, September's average high-temperature stands at a still tropical 31.3°C (88.3°F), closely related to the preceding month. In September, the recorded average low-temperature is a moderately hot 25.7°C (78.3°F).

Heat index

September's average heat index is appraised at a blistering 42°C (107.6°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

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

Rainfall

In September, the rain falls for 23.2 days. Throughout September, 97mm (3.82") of precipitation is accumulated. In Tulum, during the entire year, the rain falls for 210.8 days and collects up to 810mm (31.89") of precipitation.

Sea temperature

The months with the warmest seawater are August through October, with an average sea temperature of 29°C (84.2°F).
Note: A water temperature from 25°C (77°F) to 29°C (84.2°F) is considered very warm and enjoyable, allowing water activities to be pleasant for extended periods without irritation.

Daylight

The average length of the day in September is 12h and 15min.
On the first day of the month, sunrise is at 6:34 am and sunset at 7:04 pm. On the last day of September, sunrise is at 6:40 am and sunset at 6:38 pm EST.

Sunshine

The average sunshine in September is 9.1h.

UV index

March through September, 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 health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Heads up! UV intensity is amplified by reflections from water and sand.