September weather forecast
Port Aransas, TX

The weather in Port Aransas in September shifts towards cooler fall-like conditions, although the highest temperature still remains at a warm 84.9°F (29.4°C). On the cusp of the transitioning season yet still enjoying summer remnants, beach outings and other outdoor activities remain prevalent among locals and tourists. Slightly cooler evenings compared to the peak summer provide appealing conditions for dining al fresco or mild night-time activities. Even though September notes the highest rainfall of 2.99" (76mm) in the year, it does not profoundly impact the city's vivid lifestyle. Moreover, the sea temperature still encourages various water activities, adding to September's charm in Port Aransas, Texas.

Temperature

September welcomes an average high-temperature of a moderately hot 84.9°F (29.4°C), not much different from the preceding month. A mean low-temperature of 79.7°F (26.5°C) is a distinguishing feature of September, indicating a slight dip from daytime highs.

Heat index

September's average heat index is calculated to be a torrid 95°F (35°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. 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 remain especially vital for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense 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 in Port Aransas is 75%.

Rainfall

September is the month with the most rainfall in Port Aransas. Rain falls for 17.8 days and accumulates 2.99" (76mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Ocean temperature

In Port Aransas, the average seawater temperature in September is 84.6°F (29.2°C).
Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for swimming, diving, and similar water activities, ensuring pleasure and comfort for extended periods without feeling uneasy.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September in Port Aransas, Texas, sunrise is at 7:07 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:15 pm CDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

The months with the highest UV index in Port Aransas are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 7 in September translates into these instructions:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Boost your sun resistance with garments that are densely woven yet spacious. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.