September weather forecast
San Mateo del Mar, Mexico

The first month of the autumn, September, is still a tropical month in San Mateo del Mar, Mexico, with an average temperature varying between 24.5°C (76.1°F) and 31.1°C (88°F).

Temperature

September's arrival brings an average high-temperature of a still tropical 31.1°C (88°F), slightly deviating from August's 31.8°C (89.2°F). In San Mateo del Mar, September nights witness a steady temperature drop to a moderately hot 24.5°C (76.1°F).

Heat index

The heat index for September is computed to be a torrid 39°C (102.2°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
Heat index's context suggests values are appropriate for shady areas and slight breezes. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

September is the most humid month in San Mateo del Mar, with an average relative humidity of 74%.

Rainfall

In San Mateo del Mar, in September, during 23.5 rainfall days, 153mm (6.02") of precipitation is typically accumulated. In San Mateo del Mar, Mexico, during the entire year, the rain falls for 139 days and collects up to 719mm (28.31") of precipitation.

Daylight

In September, the average length of the day in San Mateo del Mar is 12h and 13min.
On the first day of the month, sunrise is at 6:06 am and sunset at 6:32 pm. On the last day of September, in San Mateo del Mar, sunrise is at 6:09 am and sunset at 6:09 pm CST.

Sunshine

In San Mateo del Mar, the average sunshine in September is 8.9h.

UV index

The months with the highest UV index in San Mateo del Mar, Mexico, are February through October and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.