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 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 transition into September subtly indicates a reduction in the average high-temperature, down to a hot 89.2°F (31.8°C) from August's fiery hot 96.6°F (35.9°C). An average low-temperature of 70.9°F (21.6°C) is observed during September nights.Heat index
In September, the average heat index is computed to be a very hot 100.4°F (38°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.
Humidity
The average relative humidity in September in Rio Frio is 64%.Rainfall
In Rio Frio, in September, during 15.2 rainfall days, 2.4" (61mm) of precipitation is typically accumulated. In Rio Frio, during the entire year, the rain falls for 130.9 days and collects up to 17.72" (450mm) of precipitation.Snowfall
March through December are months without snowfall in Rio Frio.Daylight
In Rio Frio, Texas, the average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 7:16 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 7:25 pm CDT.
Sunshine
The average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 6 during September translates into the following directions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Rio Frio in September?
What is the average humidity in September in Rio Frio?
How many days does it rain in September in Rio Frio?
When it does not snow in Rio Frio?
What is the average length of the day in September in Rio Frio?
When are sunrise and sunset in September in Rio Frio?
How long on average sun shines in September in Rio Frio?
What is the UV index intensity in September in Rio Frio?
Average temperature in September
Rio Frio, TX
- Average high temperature in September: 89.2°F
The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is January (62.1°F).
- Average low temperature in September: 70.9°F
The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (43.9°F).
Average pressure in September
Rio Frio, TX
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Rio Frio, TX
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is May (9.8mph).
The calmest months (with the lowest average wind speed) are September and December (7.1mph).
Average humidity in September
Rio Frio, TX
- Average humidity in September: 64%
The month with the highest relative humidity is May (69%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Rio Frio, TX
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is November (0.79").
Average rainfall days in September
Rio Frio, TX
- Average rainfall days in September: 15.2 days
The months with the highest number of rainy days are May and September (15.2 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Rio Frio, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Rio Frio, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Rio Frio, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are November and December (Average sunshine: 5h and 36min).
Average sunshine days in September
Rio Frio, TX
- Average sunshine days in September: 13 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is September (13 days).
Average UV index in September
Rio Frio, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Rio Frio, TX
- Average cloud cover in September: 33
The month with the most cloud cover is March (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Rio Frio, 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 Frio, Texas, USA
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