September weather forecast
Martinsville, TX

The first month of the autumn, September, is still a tropical month in Martinsville, Texas, with an average temperature varying between 88.9°F (31.6°C) and 67.6°F (19.8°C).

Temperature

In the transition to September, Martinsville observes a minor drop in the average high-temperature, shifting from a torrid 95°F (35°C) in August to a tropical 88.9°F (31.6°C). September nights in Martinsville observe an average temperature dip to an enjoyable 67.6°F (19.8°C).

Heat index

The average heat index in September is calculated to be an extremely hot 104°F (40°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
When assessing, remember that heat index measurements are for light winds and shaded spots. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

The average relative humidity in September is 72%.

Rainfall

In Martinsville, Texas, in September, during 15 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Martinsville, Texas, during the entire year, the rain falls for 160.4 days and collects up to 35.83" (910mm) of precipitation.

Snowfall

Months with snowfall in Martinsville are January through March, September and December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Martinsville, during the entire year, snow falls for 2.6 days and aggregates up to 0.79" (20mm) of snow.

Daylight

The average length of the day in September is 12h and 21min.
On the first day of the month, sunrise is at 6:53 am and sunset at 7:41 pm. On the last day of September, in Martinsville, sunrise is at 7:11 am and sunset at 7:03 pm CDT.

Sunshine

The average sunshine in September in Martinsville, Texas, is 9.1h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 6 in September converts into the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.