September weather forecast
Dallas, TX

The shift into September replaces Dallas's hot summer with the early stages of autumn, characterized by cooler temperatures, increased rainfall, and shorter daylight hours. The transition from August manifests in a noticeable drop in temperature and a minimal decrease in wind speed. The slight increase in rainfall from August's 2.6" (66mm) indicates the onset of the region's wet season. A gradual rise in cloud cover commences, adding to the charm of the upcoming weather transition. This month is ideal for travelers preferring mild outdoor activities, with conditions being favourable for leisurely exploring the city's diverse offerings.

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from a torrid 96.1°F (35.6°C) in August to a hot 87.8°F (31°C). In September, Dallas's temperature tends to fall to an average low of 70.5°F (21.4°C) during the night.

Heat index

The heat index for September is appraised at a torrid 95°F (35°C). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Remember that heat index calculations are made for conditions in the shade with light wind. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In September, the average relative humidity is 62%.

Rainfall

In September, the rain falls for 14.1 days. Throughout September, 2.32" (59mm) of precipitation is accumulated. Throughout the year, there are 141.2 rainfall days, and 30.12" (765mm) of precipitation is accumulated.

Snowfall

In Dallas, Texas, snow does not fall in March through October.

Daylight

In September, the average length of the day in Dallas is 12h and 22min.
On the first day of the month, sunrise is at 7:02 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:12 pm CDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum UV index of 6 during September leads to these instructions:
Resist overexposure. Safeguarding from solar damage is indispensable. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.