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
September brings a minor shift in the average high-temperature, adjusting from a very hot 95.7°F (35.4°C) in August to a tropical 87.8°F (31°C). In Leander, the September nights cool down to an average low of 70.3°F (21.3°C).Heat index
Throughout September, the heat index is estimated at a fiery hot 98.6°F (37°C). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.Remember that heat index calculations are made for conditions in the shade with light wind. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.
Humidity
The average relative humidity in September in Leander, Texas, is 67%.Rainfall
In Leander, during September, the rain falls for 15 days and regularly aggregates up to 2.95" (75mm) of precipitation. Throughout the year, there are 142.7 rainfall days, and 26.26" (667mm) of precipitation is accumulated.Snowfall
In Leander, snow does not fall in March through December.Daylight
The average length of the day in September in Leander is 12h and 20min.On the first day of the month, sunrise is at 7:08 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:17 pm CDT.
Sunshine
In September, the average sunshine in Leander is 8.4h.UV index
In Leander, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 6 during September translates into the following guidance:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Leander in September?
What is the average humidity in September in Leander?
How much does it rain in Leander in September?
When it does not snow in Leander?
How many hours of daylight does Leander have in September?
When are sunrise and sunset in September in Leander?
How many hours of sunshine does Leander have in September?
How high is the UV index in September in Leander?
Average temperature in September
Leander, TX
- Average high temperature in September: 87.8°F
The warmest month (with the highest average high temperature) is August (95.7°F).
The month with the lowest average high temperature is January (58.6°F).
- Average low temperature in September: 70.3°F
The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (41.7°F).
Average pressure in September
Leander, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Leander, TX
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is March (9.9mph).
The calmest month (with the lowest average wind speed) is September (6.5mph).
Average humidity in September
Leander, TX
- Average humidity in September: 67%
The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is August (58%).
Average rainfall in September
Leander, TX
- Average rainfall in September: 2.95"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days in September
Leander, TX
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Leander, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.2").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Leander, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.7 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
Leander, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Leander, TX
- Average sunshine days in September: 13.2 days
The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in September
Leander, 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
Leander, TX
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Leander, 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).
Leander, Texas, USA
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