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
With the arrival of September, Llano experiences a modest decline in average high-temperatures, transitioning from a very hot 95°F (35°C) in August to a tropical 86.9°F (30.5°C). Llano records an average nighttime low of 68.9°F (20.5°C) in September.Heat index
The average heat index in September is evaluated at a sweltering 95°F (35°C). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.Always consider that heat index estimations are for light winds and places in the shade. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.
Humidity
In September, the average relative humidity in Llano is 65%.Rainfall
In Llano, in September, during 13.3 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. Throughout the year, there are 123.8 rainfall days, and 21.18" (538mm) of precipitation is accumulated.Snowfall
March through November are months without snowfall.Daylight
The average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 7:11 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:20 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index in Llano is 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September in Llano?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Llano have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Llano, TX
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is August (95°F).
The month with the lowest average high temperature is January (59.4°F).
- Average low temperature in September: 68.9°F
The month with the highest average low temperature is August (74.3°F).
The coldest month (with the lowest average low temperature) is January (40.8°F).
Average pressure in September
Llano, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Llano, TX
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is September (7mph).
Average humidity in September
Llano, TX
- Average humidity in September: 65%
The month with the highest relative humidity is May (72%).
The month with the lowest relative humidity is August (56%).
Average rainfall in September
Llano, TX
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in September
Llano, TX
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Llano, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Llano, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.8 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
Llano, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are November and December (Average sunshine: 5h and 42min).
Average sunshine days in September
Llano, TX
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is May (13.2 days).
Average UV index in September
Llano, TX
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Llano, TX
- Average cloud cover in September: 31
The month with the most cloud cover is May (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Llano, 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).
Llano, Texas, USA
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