September weather forecast
San Felipe Usila, Mexico

September, the first month of the autumn in San Felipe Usila, is also a hot month, with an average temperature varying between 30.8°C (87.4°F) and 21.1°C (70°F).

Temperature

The onset of September brings with it an average high-temperature of a still hot 30.8°C (87.4°F), showing a negligible variation from the month before. During the nights in September, San Felipe Usila experiences a consistent average temperature of 21.1°C (70°F).

Heat index

The heat index for September is evaluated at an extremely hot 41°C (105.8°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', determines the feeling of heat when you account for the relative humidity. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

The months with the highest humidity are January, September, November and December, with an average relative humidity of 83%.

Rainfall

In September, the rain falls for 25.5 days. Throughout September, 130mm (5.12") of precipitation is accumulated. Throughout the year, in San Felipe Usila, there are 209 rainfall days, and 998mm (39.29") of precipitation is accumulated.

Daylight

In San Felipe Usila, the average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:11 am and sunset at 6:39 pm. On the last day of September, sunrise is at 6:16 am and sunset at 6:15 pm CST.

Sunshine

In San Felipe Usila, the average sunshine in September is 8.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.