Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a fiery hot 95°F (35°C) in August to a hot 88.9°F (31.6°C). September generally records an average low-temperature of 67.6°F (19.8°C).Heat index
Throughout September, the heat index is estimated at a scorching 104°F (40°C). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.The metrics for the heat index are tailored for both shady environments and light winds. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.
Humidity
The average relative humidity in September is 72%.Rainfall
In Martinsville, in September, during 15 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Martinsville, during the entire year, the rain falls for 160.4 days and collects up to 35.83" (910mm) of precipitation.Snowfall
January through March, September and December are months with snowfall. 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
In Martinsville, 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
In Martinsville, the average sunshine in September is 9.1h.UV index
In Martinsville, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum UV index of 6 in September translates into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September in Martinsville?
Average temperature in September
Martinsville, TX
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is August (95°F).
The month with the lowest average high temperature is January (55.8°F).
- Average low temperature in September: 67.6°F
The month with the highest average low temperature is August (73.2°F).
The coldest month (with the lowest average low temperature) is January (39.2°F).
Average pressure in September
Martinsville, TX
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Martinsville, TX
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest months (with the lowest average wind speed) are July, August and September (4.8mph).
Average humidity in September
Martinsville, TX
- Average humidity in September: 72%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is August (70%).
Average rainfall in September
Martinsville, TX
- Average rainfall in September: 2.83"
The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.44").
Average rainfall days in September
Martinsville, TX
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is March (15.5 days).
The month with the least rainy days is November (10.2 days).
Average snowfall in September
Martinsville, TX
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (0.39").
The months with the least snowfall are April, May, June, July, August, October and November (0").
Average snowfall days in September
Martinsville, TX
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (0.9 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Martinsville, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Martinsville, TX
- Average sunshine days in September: 12.7 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is February (12.3 days).
Average UV index in September
Martinsville, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Martinsville, TX
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Martinsville, TX
- Average visibility in September: 5mi
The months with the highest visibility are June, August, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, July, September and December (5mi).
Martinsville, Texas, USA
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