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 snowfall 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
September
Weather in September
Temperature
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a torrid 37.3°C (99.1°F) in August to a hot 32.9°C (91.2°F). Vallecillo, during September, witnesses an average low-temperature of 24.1°C (75.4°F).Heat index
September's average heat index is appraised at a blisteringly hot 40°C (104°F). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.Records show heat index calculations are tailored for shaded regions and mild winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. 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. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.
Humidity
September is the most humid month, with an average relative humidity of 63%.Rainfall
September is the month with the most rainfall in Vallecillo. Rain falls for 16.7 days and accumulates 96mm (3.78") of precipitation.Snowfall
January through November are months without snowfall.Daylight
In September, the average length of the day in Vallecillo, Mexico, is 12h and 18min.On the first day of the month, sunrise is at 6:19 am and sunset at 6:59 pm. On the last day of September, sunrise is at 6:32 am and sunset at 6:27 pm CST.
Sunshine
In Vallecillo, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 7 in September translates into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Vallecillo in September?
What is the most humid month in Vallecillo?
What is the average humidity in September in Vallecillo?
What is the rainiest month in Vallecillo?
How much does it rain in Vallecillo in September?
When it does not snow in Vallecillo?
What is the average length of the day in September in Vallecillo?
What time are sunrise and sunset in September in Vallecillo?
How long on average sun shines in September in Vallecillo?
How high is the UV index in September in Vallecillo?
Average temperature in September
Vallecillo, Mexico
- Average high temperature in September: 32.9°C
The warmest month (with the highest average high temperature) is August (37.3°C).
The month with the lowest average high temperature is January (20.5°C).
- Average low temperature in September: 24.1°C
The month with the highest average low temperature is August (26°C).
The coldest month (with the lowest average low temperature) is January (11°C).
Average pressure in September
Vallecillo, Mexico
- Average pressure in September: 1013.7mbar
The month with the highest atmospheric pressure is January (1020mbar).
The month with the lowest atmospheric pressure is May (1011.4mbar).
Average wind speed in September
Vallecillo, Mexico
- Average wind speed in September: 14.5km/h
The windiest month (with the highest average wind speed) is July (20.7km/h).
The calmest month (with the lowest average wind speed) is December (13.2km/h).
Average humidity in September
Vallecillo, Mexico
- Average humidity in September: 63%
The month with the highest relative humidity is September (63%).
The month with the lowest relative humidity is August (52%).
Average rainfall in September
Vallecillo, Mexico
- Average rainfall in September: 96mm
The wettest month (with the highest rainfall) is September (96mm).
The driest months (with the least rainfall) are January and February (11mm).
Average rainfall days in September
Vallecillo, Mexico
- Average rainfall days in September: 16.7 days
The month with the highest number of rainy days is September (16.7 days).
The month with the least rainy days is January (6 days).
Average snowfall days in September
Vallecillo, Mexico
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Vallecillo, Mexico
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The months with the least sunshine are November and December (Average sunshine: 6h and 18min).
Average sunshine days in September
Vallecillo, Mexico
- Average sunshine days in September: 11.7 days
The month with the most sunshine days is January (23.3 days).
The month with the least sunshine days is September (11.7 days).
Average UV index in September
Vallecillo, Mexico
- Average UV index in September: 7
The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in September
Vallecillo, Mexico
- Average cloud cover in September: 32
The month with the most cloud cover is September (Cloud cover 32).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Vallecillo, 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).
