September weather forecastLavaca, AR
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Lavaca, Arkansas, with an average temperature fluctuating between 62.6°F (17°C) and 84.4°F (29.1°C).Temperature
During the shift to September, a minor reduction in average high-temperature is observed, shifting from a tropical 91.4°F (33°C) in August to a moderately hot 84.4°F (29.1°C). From significant daily highs, Lavaca's nights in September cool down to an average low-temperature of 62.6°F (17°C).Heat index
September's heat index is calculated to be a tropical 91.4°F (33°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.Heat index values are typically calculated for conditions of shade and a light breeze. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Humidity
In Lavaca, Arkansas, the average relative humidity in September is 72%.Rainfall
In Lavaca, Arkansas, in September, during 9.6 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. In Lavaca, Arkansas, during the entire year, the rain falls for 106.9 days and collects up to 10.71" (272mm) of precipitation.Snowfall
In Lavaca, snow does not fall in April through October.Daylight
In September, the average length of the day in Lavaca is 12h and 23min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:43 pm. On the last day of September, in Lavaca, sunrise is at 7:11 am and sunset at 7:01 pm CDT.
Sunshine
The average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September in Lavaca 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: In September, the maximum UV index of 6 suggests this advice:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lavaca, AR
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is July (93.2°F).
The month with the lowest average high temperature is January (48.2°F).
- Average low temperature in September: 62.6°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in September
Lavaca, AR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Lavaca, AR
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).
Average humidity in September
Lavaca, AR
- Average humidity in September: 72%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall in September
Lavaca, AR
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is May (1.46").
The driest month (with the least rainfall) is December (0.51").
Average rainfall days in September
Lavaca, AR
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is July (12.3 days).
The month with the least rainy days is January (5.1 days).
Average snowfall in September
Lavaca, AR
- Average snowfall in September: 0"
The month with the highest snowfall is March (0.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Lavaca, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lavaca, AR
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Lavaca, AR
- Average sunshine days in September: 17 days
The month with the most sunshine days is December (23.9 days).
The month with the least sunshine days is August (14.5 days).
Average UV index in September
Lavaca, AR
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Lavaca, AR
- Average cloud cover in September: 27
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in September
Lavaca, AR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
