September weather forecastPetapa, Mexico

Weather in September

September, the first month of the autumn in Petapa, is still a tropical month, with an average temperature fluctuating between 32°C (89.6°F) and 22.7°C (72.9°F).

Temperature

The onset of September brings with it an average high-temperature of a still tropical 32°C (89.6°F), showing a negligible variation from the month before. During the month of September, the temperature generally drops to a low average of 22.7°C (72.9°F).

Heat index

During September, the heat index is estimated at a blisteringly hot 42°C (107.6°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is the outcome of merging air's temperature and its humidity metrics. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

September is the most humid month, with an average relative humidity of 75%.

Rainfall

In Petapa, Mexico, during September, the rain falls for 18.3 days and regularly aggregates up to 69mm (2.72") of precipitation. Throughout the year, there are 110.2 rainfall days, and 345mm (13.58") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 13min.
On the first day of September, sunrise is at 6:07 am and sunset at 6:33 pm. On the last day of the month, sunrise is at 6:10 am and sunset at 6:09 pm CST.

Sunshine

In September, the average sunshine is 8.8h.

UV index

The months with the highest UV index are February through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 7 in September translates into the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime 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. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.