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 sea temperature 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 average high-temperature in September, at a warm 85.6°F (29.8°C), reveals a modest deviation from August's 88.3°F (31.3°C). A minimal decline in temperature from daytime highs is anticipated in Rockport throughout the September nights, averaging 78.4°F (25.8°C).Heat index
During September, the heat index is calculated to be a very hot 96.8°F (36°C). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.Heat index details are generally centered around shaded locations and a mild breeze. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', combines both the air temperature and the humidity level to give a perceived human temperature. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. 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.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In Rockport, the average relative humidity in September is 75%.Rainfall
The month with the most rainfall is September, when the rain falls for 18 days and typically aggregates up to 3.31" (84mm) of precipitation.Snowfall
In Rockport, snow does not fall in January, March through November.Ocean temperature
In September, the average ocean temperature in Rockport is 84.7°F (29.3°C).Note: Engaging in water activities, such as swimming or diving, in temperatures from 77°F (25°C) to 84.2°F (29°C) is very pleasurable for extended periods, without any discomfort.
Daylight
The average length of the day in September is 12h and 19min.On the first day of September in Rockport, sunrise is at 7:07 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:14 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, a regular UV index of 7 translates into these guidelines:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Beware! Reflections from sand and water can intensify the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
What is the wettest month?
How many days does it rain in September?
When it does not snow?
What is the water temperature in September?
How many hours of daylight does Rockport have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the month with the highest UV index?
What is the UV index intensity in September?
Average temperature in September
Rockport, TX
- Average high temperature in September: 85.6°F
The warmest month (with the highest average high temperature) is August (88.3°F).
The month with the lowest average high temperature is January (62.2°F).
- Average low temperature in September: 78.4°F
The month with the highest average low temperature is August (81.1°F).
The coldest month (with the lowest average low temperature) is January (53.1°F).
Average pressure in September
Rockport, TX
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are May and June (29.9"Hg).
Average wind speed in September
Rockport, TX
- Average wind speed in September: 10.4mph
The windiest month (with the highest average wind speed) is May (13.3mph).
The calmest month (with the lowest average wind speed) is September (10.4mph).
Average humidity in September
Rockport, TX
- Average humidity in September: 75%
The months with the highest relative humidity are February, March and May (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Rockport, TX
- Average rainfall in September: 3.31"
The wettest month (with the highest rainfall) is September (3.31").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in September
Rockport, TX
- Average rainfall days in September: 18 days
The month with the highest number of rainy days is September (18 days).
The month with the least rainy days is February (8.2 days).
Average snowfall in September
Rockport, TX
- Average snowfall in September: 0"
The months with the highest snowfall are February and December (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Rockport, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Rockport, TX
- Average sea temperature in September: 84.7°F
The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (61.1°F).
Average daylight in September /
Average sunshine in September
Rockport, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
Rockport, TX
- Average sunshine days in September: 10.6 days
The month with the most sunshine days is March (20.3 days).
The month with the least sunshine days is September (10.6 days).
Average UV index in September
Rockport, TX
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Rockport, TX
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Rockport, 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).
Rockport, Texas, USA
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