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 transition into September is accompanied by a slight temperature decrease, with the average high-temperature shifting from a tropical 91.9°F (33.3°C) in August to a moderately hot 83.3°F (28.5°C). Throughout the month of September, Sundown witnesses an average temperature of 64°F (17.8°C).Heat index
The heat index in September is evaluated at a tropical 86°F (30°C). Prolonged activity during exposure might result in a state of fatigue and cause heat cramps.When assessing, remember that heat index measurements are for light winds and shaded spots. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
Humidity
The most humid month in Sundown is September, with an average relative humidity of 56%.Rainfall
September is the month with the most rainfall in Sundown. Rain falls for 10.5 days and accumulates 1.77" (45mm) of precipitation.Snowfall
In Sundown, snow does not fall in May through September.Daylight
In Sundown, the average length of the day in September is 12h and 22min.On the first day of September in Sundown, sunrise is at 7:24 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 7:35 pm CDT.
Sunshine
In Sundown, Texas, the average sunshine in September is 9h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 6 during September translates into the following directions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. 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 hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
How hot is it in Sundown in September?
What is the most humid month in Sundown?
What is the average humidity in September in Sundown?
What is the rainiest month in Sundown?
How many days does it rain in September in Sundown?
When it does not snow in Sundown?
Does it snow in Sundown in September?
How many hours of daylight does Sundown have in September?
When are sunrise and sunset in September in Sundown?
How many hours of sunshine does Sundown have in September?
How high is the UV index in September in Sundown?
Average temperature in September
Sundown, TX
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is June (92.5°F).
The month with the lowest average high temperature is December (52.5°F).
- Average low temperature in September: 64°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).
Average pressure in September
Sundown, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Sundown, TX
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is April (13.3mph).
The calmest month (with the lowest average wind speed) is August (9.5mph).
Average humidity in September
Sundown, TX
- Average humidity in September: 56%
The month with the highest relative humidity is September (56%).
The month with the lowest relative humidity is April (35%).
Average rainfall in September
Sundown, TX
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is September (1.77").
The driest month (with the least rainfall) is February (0.28").
Average rainfall days in September
Sundown, TX
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is September (10.5 days).
The month with the least rainy days is November (2.1 days).
Average snowfall in September
Sundown, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Sundown, TX
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are February and December (2.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sundown, 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: 9h and 0min
The month with the most sunshine is June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Sundown, TX
- Average sunshine days in September: 18.2 days
The month with the most sunshine days is January (27.3 days).
The month with the least sunshine days is September (18.2 days).
Average UV index in September
Sundown, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Sundown, TX
- Average cloud cover in September: 24
The month with the most cloud cover is September (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 14).
Average visibility in September
Sundown, 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).
Sundown, Texas, USA
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