September weather forecastHallettsville, TX
September
Weather in September
September, the first month of the autumn in Hallettsville, is still a hot month, with an average temperature fluctuating between 88.9°F (31.6°C) and 71.8°F (22.1°C).Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from a fiery hot 95.9°F (35.5°C) in August to a tropical 88.9°F (31.6°C). An average nighttime temperature of 71.8°F (22.1°C) is observed during September.Heat index
Throughout September, the heat index is appraised at a blisteringly hot 105.8°F (41°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.The heat index's values are generally associated with conditions in shade and light breezes. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.
Humidity
In September, the average relative humidity is 74%.Rainfall
In Hallettsville, in September, during 17.8 rainfall days, 3.31" (84mm) of precipitation is typically accumulated. Throughout the year, there are 166.8 rainfall days, and 28.7" (729mm) of precipitation is accumulated.Snowfall
February through November are months without snowfall.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 7:05 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:14 pm CDT.
Sunshine
In Hallettsville, the average sunshine in September is 8.2h.UV index
In Hallettsville, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The average daily UV index of 6 in September transforms into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hallettsville, TX
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is August (95.9°F).
The month with the lowest average high temperature is January (61°F).
- Average low temperature in September: 71.8°F
The month with the highest average low temperature is August (75.6°F).
The coldest month (with the lowest average low temperature) is January (44.6°F).
Average pressure in September
Hallettsville, 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 (29.91"Hg).
Average wind speed in September
Hallettsville, TX
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is September (6mph).
Average humidity in September
Hallettsville, TX
- Average humidity in September: 74%
The months with the highest relative humidity are March and May (78%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Hallettsville, TX
- Average rainfall in September: 3.31"
The wettest month (with the highest rainfall) is May (3.86").
The driest month (with the least rainfall) is February (1.22").
Average rainfall days in September
Hallettsville, TX
- Average rainfall days in September: 17.8 days
The month with the highest number of rainy days is September (17.8 days).
The month with the least rainy days is January (11.2 days).
Average snowfall in September
Hallettsville, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.2").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Hallettsville, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Hallettsville, TX
- Average daylight in September: 12h and 18min
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 12min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
Hallettsville, TX
- Average sunshine days in September: 10 days
The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in September
Hallettsville, 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
Hallettsville, TX
- Average cloud cover in September: 36
The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Hallettsville, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, August, September, October, November and December (6mi).
The months with the lowest visibility are March, April, May, June and July (5mi).
