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 implies a gentle temperature shift, with average high-temperatures reducing from August's very hot 97.3°F (36.3°C) to a hot 87.4°F (30.8°C). In O'Brien, September is marked by an average low-temperature of 69.4°F (20.8°C).Heat index
For most parts of September, the heat index is evaluated at a hot 93.2°F (34°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.Note that heat index values are valued for light wind and location in the shade. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a composite of temperature and humidity figures to convey how warm it feels. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. 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.
Humidity
The months with the highest humidity are May, September, November and December, with an average relative humidity of 56%.Rainfall
In September, the rain falls for 11.7 days. Throughout September, 2.36" (60mm) of precipitation is accumulated. In O'Brien, Texas, during the entire year, the rain falls for 92.6 days and collects up to 17.99" (457mm) of precipitation.Snowfall
In O'Brien, Texas, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September in O'Brien, sunrise is at 7:14 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 7:24 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In O'Brien, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: During September, 6 as the daily maximum UV index converts into the following advice:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the most humid month?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does O'Brien have in September?
What is the UV index reading in September?
Average temperature in September
O'Brien, TX
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is August (97.3°F).
The months with the lowest average high temperature are January and December (55.4°F).
- Average low temperature in September: 69.4°F
The month with the highest average low temperature is July (77°F).
The coldest month (with the lowest average low temperature) is January (36.5°F).
Average pressure in September
O'Brien, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
O'Brien, TX
- Average wind speed in September: 9.4mph
The windiest month (with the highest average wind speed) is April (13mph).
The calmest month (with the lowest average wind speed) is September (9.4mph).
Average humidity in September
O'Brien, TX
- Average humidity in September: 56%
The months with the highest relative humidity are May, September, November and December (56%).
The month with the lowest relative humidity is August (45%).
Average rainfall in September
O'Brien, TX
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days in September
O'Brien, TX
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is September (11.7 days).
The month with the least rainy days is January (3.7 days).
Average snowfall in September
O'Brien, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
O'Brien, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
O'Brien, 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 4min
The month with the most sunshine is June (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in September
O'Brien, TX
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is January (26.3 days).
The month with the least sunshine days is September (16.3 days).
Average UV index in September
O'Brien, TX
- Average UV index in September: 6
The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
O'Brien, TX
- Average cloud cover in September: 26
The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
O'Brien, 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).
O'Brien, Texas, USA
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