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
The start of September comes with a small reduction in the average high-temperature, subtly receding from a fiery hot 95.2°F (35.1°C) in August to a hot 86.4°F (30.2°C). Throughout September, the temperature falls to an average low of 68.2°F (20.1°C).Heat index
The heat index in September is appraised at a tropical 93.2°F (34°C). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Humidity
In September, the average relative humidity is 64%.Rainfall
In Decatur, during September, the rain falls for 13.5 days and regularly aggregates up to 2.95" (75mm) of precipitation. In Decatur, during the entire year, the rain falls for 131.9 days and collects up to 28.31" (719mm) of precipitation.Snowfall
April through November are months without snowfall in Decatur.Daylight
In September, the average length of the day in Decatur is 12h and 22min.On the first day of September, sunrise is at 7:05 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:15 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Decatur, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: During September, 6 as the daily maximum UV index converts into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September in Decatur?
When is the sunrise / sunset in September?
How many hours of sunshine does Decatur have in September?
What is the UV index intensity in September?
Average temperature in September
Decatur, TX
- Average high temperature in September: 86.4°F
The warmest month (with the highest average high temperature) is August (95.2°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in September: 68.2°F
The month with the highest average low temperature is August (74.8°F).
The coldest month (with the lowest average low temperature) is January (37.4°F).
Average pressure in September
Decatur, 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 (29.89"Hg).
Average wind speed in September
Decatur, TX
- Average wind speed in September: 7mph
The windiest months (with the highest average wind speed) are March and April (10.7mph).
The calmest month (with the lowest average wind speed) is September (7mph).
Average humidity in September
Decatur, TX
- Average humidity in September: 64%
The month with the highest relative humidity is May (74%).
The month with the lowest relative humidity is August (56%).
Average rainfall in September
Decatur, TX
- Average rainfall in September: 2.95"
The wettest month (with the highest rainfall) is October (3.62").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in September
Decatur, TX
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in September
Decatur, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Decatur, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Decatur, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in September
Decatur, TX
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is January (23.6 days).
The month with the least sunshine days is May (13.5 days).
Average UV index in September
Decatur, TX
- Average UV index in September: 6
The months with the highest UV index are 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
Decatur, TX
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 18).
Average visibility in September
Decatur, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Decatur, Texas, USA
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