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 sea temperature 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
Port Lavaca signifies an average high-temperature of a still hot 86.9°F (30.5°C) in September, closely mirroring the 90.7°F (32.6°C) of August. Throughout September, Port Lavaca experiences a low-temperature average of 76.1°F (24.5°C).Heat index
September's mean heat index is evaluated at a fiery hot 98.6°F (37°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.In reference to the heat index, it's for places in shade and with a slight wind. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.
Humidity
In September, the average relative humidity is 74%.Rainfall
The month with the most rainfall is September, when the rain falls for 19.8 days and typically aggregates up to 3.35" (85mm) of precipitation.Snowfall
February through December are months without snowfall.Ocean temperature
In September, the average ocean temperature in Port Lavaca is 84.4°F (29.1°C).Note: Surface water temperatures between 77°F (25°C) and 84.2°F (29°C) offer outstanding conditions for any water activity, providing extreme pleasure for extended periods.
Daylight
In Port Lavaca, the average length of the day in September is 12h and 19min.On the first day of September, sunrise is at 7:05 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:13 pm CDT.
Sunshine
The average sunshine in September is 8.7h.UV index
In Port Lavaca, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum high daily UV index of 6 during September translates into the following directions:
Steer clear of overexposure. Fair-skinned individuals can be scorched 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. Opt for tightly woven and loose clothing to enhance protection from the Sun. Notice! The Sun's UV exposure elevates with sand and water reflections.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
What is the wettest month?
How much does it rain in September?
When it does not snow?
How warm is the water in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Port Lavaca have in September?
What is the UV index intensity in September?
Average temperature in September
Port Lavaca, TX
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is August (90.7°F).
The month with the lowest average high temperature is January (62.2°F).
- Average low temperature in September: 76.1°F
The month with the highest average low temperature is August (79.3°F).
The coldest month (with the lowest average low temperature) is January (49.6°F).
Average pressure in September
Port Lavaca, TX
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Port Lavaca, TX
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is September (8.3mph).
Average humidity in September
Port Lavaca, TX
- Average humidity in September: 74%
The months with the highest relative humidity are February and March (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Port Lavaca, TX
- Average rainfall in September: 3.35"
The wettest month (with the highest rainfall) is September (3.35").
The driest month (with the least rainfall) is February (0.87").
Average rainfall days in September
Port Lavaca, TX
- Average rainfall days in September: 19.8 days
The month with the highest number of rainy days is September (19.8 days).
The month with the least rainy days is January (10.8 days).
Average snowfall in September
Port Lavaca, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Port Lavaca, TX
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Port Lavaca, TX
- Average sea temperature in September: 84.5°F
The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (60.1°F).
Average daylight in September /
Average sunshine in September
Port Lavaca, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
Port Lavaca, TX
- Average sunshine days in September: 8.5 days
The month with the most sunshine days is January (17.5 days).
The month with the least sunshine days is September (8.5 days).
Average UV index in September
Port Lavaca, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Port Lavaca, TX
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Port Lavaca, 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).
Port Lavaca, Texas, USA
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