September weather forecast
Tomatlán, Mexico

September, the first month of the autumn in Tomatlán, is still a tropical month, with an average temperature varying between 23°C (73.4°F) and 31.2°C (88.2°F).

Temperature

The commencement of September brings an average high-temperature of a still tropical 31.2°C (88.2°F), marking an inconsequential divergence from August. Tomatlán reports an average nighttime low-temperature of 23°C (73.4°F) in September.

Heat index

The heat index in September is appraised at a scorching 42°C (107.6°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 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.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

With an average relative humidity of 80%, September is the most humid month.

Rainfall

September is the month with the most rainfall. Rain falls for 22 days and accumulates 186mm (7.32") of precipitation.

Daylight

The average length of the day in September in Tomatlán is 12h and 15min.
On the first day of September, sunrise is at 6:45 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:49 pm CST.

Sunshine

With an average of 8.9h of sunshine, September has the least sunshine of the year.

UV index

April through October, with an average maximum UV index of 7, are months with the highest UV index in Tomatlán. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. 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. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.