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

September's arrival brings an average high-temperature of a still hot 31.3°C (88.3°F), demonstrating subtle variation from the preceding month. In September, the nighttime temperature in Tulum lowers to an average of 25.7°C (78.3°F).

Heat index

September's mean heat index is appraised at an extremely hot 42°C (107.6°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in September in Tulum is 79%.

Rainfall

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

Sea temperature

August through October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater.
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are regarded as highly pleasant, making all water activities enjoyable without any discomfort over long durations.

Daylight

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

Sunshine

The average sunshine in September in Tulum is 9.1h.

UV index

March through September, with an average maximum UV index of 7, are months with the highest UV index in Tulum. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Stay aware! UV radiation is magnified when reflecting off sand and water.