September weather forecast
Nassau Bay, TX

The first month of the autumn, September, is still a hot month in Nassau Bay, Texas, with an average temperature ranging between min 75.7°F (24.3°C) and max 86.2°F (30.1°C).

Temperature

September brings an average high-temperature of a still tropical 86.2°F (30.1°C), nearly identical to the preceding month. Throughout September, the temperature in Nassau Bay falls to an average low of 75.7°F (24.3°C).

Heat index

Throughout September, the heat index is estimated at a torrid 98.6°F (37°C). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

The average relative humidity in September in Nassau Bay is 75%.

Rainfall

The month with the most rainfall is September, when the rain falls for 15.9 days and typically aggregates up to 1.5" (38mm) of precipitation.

Snowfall

January, September and December are months with snowfall in Nassau Bay, Texas. The months with the most snowfall days in Nassau Bay are January, September and December, with an average of 0.1 snowfall days.

Daylight

In September, the average length of the day in Nassau Bay, Texas, is 12h and 20min.
On the first day of the month, sunrise is at 6:58 am and sunset at 7:42 pm. On the last day of September, in Nassau Bay, sunrise is at 7:13 am and sunset at 7:06 pm CDT.

Sunshine

In Nassau Bay, the average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily maximum UV index of 6 in September translates into the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.