September weather forecastGranbury, TX
September
Weather in September
The first month of the autumn, September, is still a hot month in Granbury, Texas, with temperature in the range of an average high of 87.4°F (30.8°C) and an average low of 68.9°F (20.5°C).Temperature
September's arrival signals a moderate reduction in the average high-temperature, easing from a fiery hot 95.5°F (35.3°C) in August to a tropical 87.4°F (30.8°C). September brings an average low-temperature of 68.9°F (20.5°C) to Granbury.Heat index
The heat index in September is estimated at a torrid 95°F (35°C). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant 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.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.
Humidity
The average relative humidity in September in Granbury, Texas, is 64%.Rainfall
In Granbury, during September, the rain falls for 11.8 days and regularly aggregates up to 1.54" (39mm) of precipitation. Throughout the year, in Granbury, Texas, there are 111.1 rainfall days, and 17.52" (445mm) of precipitation is accumulated.Snowfall
January, March through November are months without snowfall in Granbury, Texas.Daylight
The average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 7:06 am and sunset at 7:55 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:16 pm CDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
In Granbury, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Elude overexposure. Fair-skinned people could get burnt in less than 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. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Granbury, TX
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is August (95.5°F).
The month with the lowest average high temperature is January (56.1°F).
- Average low temperature in September: 68.9°F
The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in September
Granbury, 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 (29.9"Hg).
Average wind speed in September
Granbury, TX
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is September (7mph).
Average humidity in September
Granbury, TX
- Average humidity in September: 64%
The month with the highest relative humidity is May (72%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Granbury, TX
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days in September
Granbury, TX
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Granbury, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.39").
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Granbury, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Granbury, TX
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Granbury, TX
- Average sunshine days in September: 16 days
The month with the most sunshine days is January (25.5 days).
The month with the least sunshine days is May (15 days).
Average UV index in September
Granbury, 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
Granbury, TX
- Average cloud cover in September: 29
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Granbury, 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).
