September weather forecast
Corpus Christi, TX

September marks a transitional period for Corpus Christi, offering signs of the coveted fall season with dropping temperatures. Despite this change, it retains residual warmth from the summer, and the days continue to be long and hot. A hike in the rain volume can be noted, suggesting the onset of a cooler and wetter autumn. Simultaneously, wind speeds begin to climb, indicating an approaching shift in the weather. The rainfall volumes rise to the peak for the year, measuring at 2.05" (52mm).

Temperature

The start of September marks an average high-temperature of a still hot 89.6°F (32°C), hardly distinguishable from the conditions in August. In September, Corpus Christi experiences an average nighttime temperature of 76.8°F (24.9°C).

Heat index

The heat index in September is appraised at a blisteringly hot 104°F (40°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', comes about by integrating the temperature readings with the humidity levels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

In Corpus Christi, the average relative humidity in September is 70%.

Rainfall

September is the month with the most rainfall. Rain falls for 15 days and accumulates 2.05" (52mm) of precipitation.

Snowfall

January, March through November are months without snowfall.

Ocean temperature

In September, the average ocean temperature in Corpus Christi is 84.6°F (29.2°C).
Note: For swimming, diving, and enjoying other water activities, the range of 77°F (25°C) to 84.2°F (29°C) in water temperature is considered ideal, offering pleasure for extended periods without discomfort.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:22 am and sunset at 7:16 pm CDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

The average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.