September weather forecast
Port Lavaca, TX

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Weather in September

The first month of the autumn, September, is also a hot month in Port Lavaca, Texas, with an average temperature varying between 86.9°F (30.5°C) and 76.1°F (24.5°C).

Temperature

With the start of September, Port Lavaca measures an average high-temperature of a still tropical 86.9°F (30.5°C), not significantly differing from August's 90.7°F (32.6°C). September sees the temperature falling to a mean low of 76.1°F (24.5°C).

Heat index

For September, the heat index is computed to be a sweltering 98.6°F (37°C). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'real feel', gives an indication of how one might feel in terms of heat after considering humidity. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In Port Lavaca, the average relative humidity in September is 74%.

Rainfall

September is the month with the most rainfall in Port Lavaca. Rain falls for 19.8 days and accumulates 3.35" (85mm) of precipitation.

Snowfall

In Port Lavaca, Texas, snow does not fall in February through December.

Ocean temperature

In September, the average ocean temperature in Port Lavaca is 84.4°F (29.1°C).
Note: Swimming, diving, and other activities in water temperatures between 77°F (25°C) and 84.2°F (29°C) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

In Port Lavaca, Texas, the average length of the day in September is 12h and 19min.
On the first day of September in Port Lavaca, 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

In September, the average sunshine in Port Lavaca is 8.7h.

UV index

The average daily maximum UV index in September in Port Lavaca is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 6 translates into these guidelines:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Attention! The reflection of both water and sand can increase the intensity of UV rays.
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Frequently asked questions

How hot is it in Port Lavaca in September?

In Port Lavaca, in September, the average high-temperature is 86.9°F (30.5°C), and the average low-temperature is 76.1°F (24.5°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is computed to be 98.6°F (37°C).

What is the average humidity in September in Port Lavaca?

The average relative humidity in September in Port Lavaca, Texas, is 74%.

What is the rainiest month in Port Lavaca?

The month with the most rainfall in Port Lavaca is September, when the rain falls for 19.8 days and typically aggregates up to 3.35" (85mm) of precipitation.

How many days does it rain in September in Port Lavaca?

In Port Lavaca, Texas, during September, the rain falls for 19.8 days and regularly aggregates up to 3.35" (85mm) of precipitation.

When it does not snow in Port Lavaca?

February through December are months without snowfall in Port Lavaca, Texas.

How warm is the water in September in Port Lavaca?

In Port Lavaca, in September, the average water temperature is 84.4°F (29.1°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Port Lavaca?

In Port Lavaca, the average day length in September is 12h and 19min.

When is the sunrise / sunset in September in Port Lavaca?

In September, on the first day of the month, sunrise is at 7:05 am and sunset at 7:47 pm. On the last day of the month, in Port Lavaca, Texas, sunrise is at 7:19 am and sunset at 7:13 pm CDT.

How many hours of sunshine does Port Lavaca have in September?

In Port Lavaca, Texas, the average sunshine duration in September is 8.7h.

How high is the UV index in September in Port Lavaca?

In Port Lavaca, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Port Lavaca, TX

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).

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Average pressure in September
Port Lavaca, TX

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).

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Average wind speed in September
Port Lavaca, TX

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).

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Average humidity in September
Port Lavaca, TX

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%).

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Average rainfall in September
Port Lavaca, TX

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").

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Average rainfall days in September
Port Lavaca, TX

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).

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Average snowfall in September
Port Lavaca, TX

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").

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Average snowfall days in September
Port Lavaca, TX

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).

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Average sea temperature in September
Port Lavaca, TX

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).

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Average daylight in September /
Average sunshine in September
Port Lavaca, TX

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).

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Average sunshine days in September
Port Lavaca, TX

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).

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Average UV index in September
Port Lavaca, TX

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).

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Average cloud cover in September
Port Lavaca, TX

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).

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Average visibility in September
Port Lavaca, TX

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).

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Port Lavaca, Texas, USA

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