September weather forecast
San Andrés Hidalgo, Mexico

September, the first month of the autumn in San Andrés Hidalgo, is still a tropical month, with an average temperature fluctuating between 30.5°C (86.9°F) and 21.3°C (70.3°F).

Temperature

The onset of September notes an average high-temperature of a still tropical 30.5°C (86.9°F), subtly shifted from August's 31.7°C (89.1°F). San Andrés Hidalgo's average low-temperature for the month of September records at an agreeable 21.3°C (70.3°F).

Heat index

For most parts of September, the heat index is calculated to be a blisteringly hot 40°C (104°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The months with the highest humidity are September and October, with an average relative humidity of 82%.

Rainfall

In San Andrés Hidalgo, in September, during 25.1 rainfall days, 111mm (4.37") of precipitation is typically accumulated. Throughout the year, in San Andrés Hidalgo, there are 195.4 rainfall days, and 758mm (29.84") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of September, sunrise is at 6:12 am and sunset at 6:41 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 6:16 pm CST.

Sunshine

In San Andrés Hidalgo, the average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 6 in September interprets into the following advice:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.