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
Weather in September
Temperature
The arrival of September is marked by a minor reduction in average high-temperature, sliding from a fiery hot 100°F (37.8°C) in August to a tropical 93°F (33.9°C). During the nights in September, an average low-temperature of 77°F (25°C) is observed.Heat index
For September, the heat index is computed to be a blistering 109.4°F (43°C). Stay alert: Heat cramps and heat exhaustion are expected. Heatstroke is a likely outcome of ongoing activity.The heat index's values are generally associated with conditions in shade and light breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.
Humidity
In September, the average relative humidity is 62%.Rainfall
September is the month with the most rainfall in Rio Grande City. Rain falls for 15.3 days and accumulates 2.56" (65mm) of precipitation.Snowfall
In Rio Grande City, snow does not fall in March through December.Daylight
The average length of the day in September in Rio Grande City is 12h and 18min.On the first day of the month, sunrise is at 7:15 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:27 am and sunset at 7:22 pm CDT.
Sunshine
In Rio Grande City, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Rio Grande City is 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high daily UV index of 7 during September translates into the following directions:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. 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. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Frequently asked questions
How hot does it get in Rio Grande City in September?
What is the average humidity in September in Rio Grande City?
What is the rainiest month in Rio Grande City?
How many days does it rain in September in Rio Grande City?
When it does not snow in Rio Grande City?
How many hours of daylight does Rio Grande City have in September?
What time are sunrise and sunset in September in Rio Grande City?
How many hours of sunshine does Rio Grande City have in September?
How high is the UV index in September in Rio Grande City?
Average temperature in September
Rio Grande City, TX
- Average high temperature in September: 93°F
The warmest month (with the highest average high temperature) is August (100°F).
The month with the lowest average high temperature is January (69.8°F).
- Average low temperature in September: 77°F
The month with the highest average low temperature is August (80.1°F).
The coldest month (with the lowest average low temperature) is January (52.7°F).
Average pressure in September
Rio Grande City, TX
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).
Average wind speed in September
Rio Grande City, TX
- Average wind speed in September: 9.9mph
The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is December (9.2mph).
Average humidity in September
Rio Grande City, TX
- Average humidity in September: 62%
The month with the highest relative humidity is December (65%).
The month with the lowest relative humidity is August (53%).
Average rainfall in September
Rio Grande City, TX
- Average rainfall in September: 2.56"
The wettest month (with the highest rainfall) is September (2.56").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
Rio Grande City, TX
- Average rainfall days in September: 15.3 days
The month with the highest number of rainy days is September (15.3 days).
The month with the least rainy days is February (5.8 days).
Average snowfall days in September
Rio Grande City, TX
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Rio Grande City, TX
- 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 months with the most sunshine are June and July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Rio Grande City, TX
- Average sunshine days in September: 12.9 days
The months with the most sunshine days are July and August (22.6 days).
The month with the least sunshine days is September (12.9 days).
Average UV index in September
Rio Grande City, TX
- 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
Rio Grande City, TX
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Rio Grande City, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Rio Grande City, Texas, USA
Weather forecast for your location
2. Allow the app to use your location
