Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The transition from August to September brings an average high-temperature of a still tropical 30°C (86°F), barely different from August's 30.9°C (87.6°F). The nights of September in San Luis Acatlán, Mexico, anticipate an average low-temperature of 24.5°C (76.1°F).Heat index
The heat index for September is evaluated at a very hot 37°C (98.6°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.Bear in mind that the heat index values are determined for shaded areas and light breezes. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.
Humidity
The months with the highest humidity in San Luis Acatlán, Mexico, are September and October, with an average relative humidity of 77%.Rainfall
September is the month with the most rainfall in San Luis Acatlán. Rain falls for 23.4 days and accumulates 190mm (7.48") of precipitation.Daylight
In September, the average length of the day in San Luis Acatlán is 12h and 13min.On the first day of September, sunrise is at 6:21 am and sunset at 6:47 pm. On the last day of the month, sunrise is at 6:24 am and sunset at 6:24 pm CST.
Sunshine
September has the least sunshine of the year in San Luis Acatlán, with an average of 8.8h of sunshine.UV index
January through December, with an average maximum UV index of 7, are months with the highest UV index in San Luis Acatlán. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index, 7 during September, leads to the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Frequently asked questions
How hot is September in San Luis Acatlán?
What is the most humid month in San Luis Acatlán?
What is the average humidity in September in San Luis Acatlán?
What is the rainiest month in San Luis Acatlán?
How much does it rain in San Luis Acatlán in September?
What is the average length of the day in September in San Luis Acatlán?
When is the sunrise / sunset in September in San Luis Acatlán?
What is the month with the least sunshine in San Luis Acatlán?
How long on average sun shines in September in San Luis Acatlán?
What is the month with the highest UV index in San Luis Acatlán?
What are the months with the lowest UV index in San Luis Acatlán?
How high is the UV index in September in San Luis Acatlán?
Average temperature in September
San Luis Acatlán, Mexico
- Average high temperature in September: 30°C
The warmest month (with the highest average high temperature) is May (31.5°C).
The months with the lowest average high temperature are January and December (29.6°C).
- Average low temperature in September: 24.5°C
The month with the highest average low temperature is June (25.3°C).
The coldest months (with the lowest average low temperature) are January and February (22.8°C).
Average pressure in September
San Luis Acatlán, Mexico
- Average pressure in September: 1011mbar
The month with the highest atmospheric pressure is January (1013.3mbar).
The month with the lowest atmospheric pressure is May (1010.8mbar).
Average wind speed in September
San Luis Acatlán, Mexico
- Average wind speed in September: 9.4km/h
The windiest month (with the highest average wind speed) is June (9.8km/h).
The calmest month (with the lowest average wind speed) is December (7.8km/h).
Average humidity in September
San Luis Acatlán, Mexico
- Average humidity in September: 77%
The months with the highest relative humidity are September and October (77%).
The months with the lowest relative humidity are March and April (62%).
Average rainfall in September
San Luis Acatlán, Mexico
- Average rainfall in September: 190mm
The wettest month (with the highest rainfall) is September (190mm).
The driest month (with the least rainfall) is April (1mm).
Average rainfall days in September
San Luis Acatlán, Mexico
- Average rainfall days in September: 23.4 days
The month with the highest number of rainy days is August (24.5 days).
The month with the least rainy days is February (1.1 days).
Average daylight in September /
Average sunshine in September
San Luis Acatlán, Mexico
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 13h and 6min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in September: 8h and 5min
The months with the most sunshine are March and April (Average sunshine: 10h and 0min).
The month with the least sunshine is September (Average sunshine: 8h and 48min).
Average sunshine days in September
San Luis Acatlán, Mexico
- Average sunshine days in September: 5.3 days
The month with the most sunshine days is March (29.3 days).
The month with the least sunshine days is August (5 days).
Average UV index in September
San Luis Acatlán, Mexico
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Average cloud cover in September
San Luis Acatlán, Mexico
- Average cloud cover in September: 36
The month with the most cloud cover is September (Cloud cover 36).
The months with the least cloud cover are March and April (Cloud cover 8).
Average visibility in September
San Luis Acatlán, 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).
San Luis Acatlán, Mexico
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