September weather forecastPiedras Negras, Mexico
September
Weather in September
The first month of the autumn, September, is still a hot month in Piedras Negras, Mexico, with an average temperature fluctuating between 23.6°C (74.5°F) and 32.6°C (90.7°F).Temperature
Piedras Negras in September undergoes a slight reduction in the average high-temperature, shifting from August's very hot 37.2°C (99°F) to a tropical 32.6°C (90.7°F). In Piedras Negras, the average nighttime temperature during September is a warm 23.6°C (74.5°F).Heat index
In September, the average heat index is appraised at a torrid 38°C (100.4°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.Data suggests that the heat index is set for environments in shade and with a light wind. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'feels like' or 'real feel', is a value derived by merging air temperature with the humidity to convey how the climate feels. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. 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. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.
Humidity
In Piedras Negras, the average relative humidity in September is 58%.Rainfall
In Piedras Negras, during September, the rain falls for 13.8 days and regularly aggregates up to 55mm (2.17") of precipitation. In Piedras Negras, during the entire year, the rain falls for 89.7 days and collects up to 341mm (13.43") of precipitation.Snowfall
January through November are months without snowfall in Piedras Negras.Daylight
In Piedras Negras, the average length of the day in September is 12h and 19min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:03 pm. On the last day of September, in Piedras Negras, sunrise is at 6:35 am and sunset at 6:28 pm CST.
Sunshine
In Piedras Negras, the average sunshine in September is 8.6h.UV index
In Piedras Negras, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, a regular UV index of 6 translates into these guidelines:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Piedras Negras, Mexico
- Average high temperature in September: 32.6°C
The warmest month (with the highest average high temperature) is August (37.2°C).
The month with the lowest average high temperature is January (18.3°C).
- Average low temperature in September: 23.6°C
The month with the highest average low temperature is August (26.3°C).
The coldest month (with the lowest average low temperature) is January (8.3°C).
Average pressure in September
Piedras Negras, Mexico
- Average pressure in September: 1014.1mbar
The month with the highest atmospheric pressure is January (1020.7mbar).
The month with the lowest atmospheric pressure is May (1011.6mbar).
Average wind speed in September
Piedras Negras, Mexico
- Average wind speed in September: 14.5km/h
The windiest month (with the highest average wind speed) is June (18.8km/h).
The calmest month (with the lowest average wind speed) is December (12.4km/h).
Average humidity in September
Piedras Negras, Mexico
- Average humidity in September: 58%
The month with the highest relative humidity is November (60%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Piedras Negras, Mexico
- Average rainfall in September: 55mm
The wettest month (with the highest rainfall) is May (75mm).
The driest months (with the least rainfall) are January and February (8mm).
Average rainfall days in September
Piedras Negras, Mexico
- Average rainfall days in September: 13.8 days
The month with the highest number of rainy days is September (13.8 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Piedras Negras, Mexico
- Average snowfall in September: 0mm
The month with the highest snowfall is December (1mm).
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Piedras Negras, Mexico
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January, February and December (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Piedras Negras, Mexico
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is June (Average sunshine: 11h and 6min).
The month with the least sunshine is November (Average sunshine: 6h and 0min).
Average sunshine days in September
Piedras Negras, Mexico
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is January (25.6 days).
The month with the least sunshine days is September (14.7 days).
Average UV index in September
Piedras Negras, Mexico
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 8).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Piedras Negras, Mexico
- Average cloud cover in September: 29
The month with the most cloud cover is May (Cloud cover 32).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Piedras Negras, Mexico
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
