September weather forecast
Chetumal, Mexico

September, the first month of the autumn in Chetumal, is still a tropical month, with an average temperature varying between 31.5°C (88.7°F) and 24.4°C (75.9°F).

Temperature

The arrival of September marks a slight shift to an average high-temperature of a still tropical 31.5°C (88.7°F) from August's 31.8°C (89.2°F). In Chetumal, an average nighttime temperature of 24.4°C (75.9°F) is expected during September.

Heat index

September's average heat index is computed to be a scorching 43°C (109.4°F). Keep guard: Heat cramps and heat exhaustion are likely. Continued activity increases the risk of heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, 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 remain especially vital for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In Chetumal, the average relative humidity in September is 81%.

Rainfall

In Chetumal, in September, it is raining for 23.1 days, with typically 96mm (3.78") of accumulated precipitation. In Chetumal, during the entire year, the rain falls for 198.4 days and collects up to 752mm (29.61") of precipitation.

Sea temperature

The month with the warmest seawater is September, with an average sea temperature of 29.7°C (85.5°F).
Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.

Daylight

In Chetumal, the average length of the day in September is 12h and 14min.
On the first day of September, sunrise is at 6:38 am and sunset at 7:07 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:42 pm EST.

Sunshine

The average sunshine in September in Chetumal is 8.5h.

UV index

The months with the highest UV index are March through July and September, with an average maximum UV index of 7. 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: An average maximum UV index of 7 in September leads to these recommendations:
Stay clear of intense sun exposure. Solar protection is of utmost significance. 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 effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.