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 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 arrival of September marks a slight shift to an average high-temperature of a moderately hot 84.2°F (29°C) from August's 87.4°F (30.8°C). Port Bolivar observes a slightly reduced average nighttime temperature of 78.4°F (25.8°C) during September.Heat index
During September, the heat index is estimated at a hot 93.2°F (34°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.It is important to note that the heat index values are for shaded areas and light wind scenarios. 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 'real feel', offers an insight into how hot it feels when we factor in moisture content. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
Humidity
The average relative humidity in September is 75%.Rainfall
The month with the most rainfall is September, when the rain falls for 19.9 days and typically aggregates up to 4.29" (109mm) of precipitation.Snowfall
In Port Bolivar, snow does not fall in March through December.Daylight
In September, the average length of the day is 12h and 20min.On the first day of September, sunrise is at 6:56 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:05 pm CDT.
Sunshine
In Port Bolivar, the average sunshine in September is 8.9h.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 7 during September morphs into the following directions:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
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?
What is the wettest month?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What are the months with the highest UV index?
How high is the UV index in September?
Average temperature in September
Port Bolivar, TX
- Average high temperature in September: 84.2°F
The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is January (59.7°F).
- Average low temperature in September: 78.4°F
The month with the highest average low temperature is August (81.9°F).
The coldest month (with the lowest average low temperature) is January (51.6°F).
Average pressure in September
Port Bolivar, TX
- Average pressure in September: 29.96"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
Port Bolivar, TX
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is August (9.4mph).
Average humidity in September
Port Bolivar, TX
- Average humidity in September: 75%
The months with the highest relative humidity are February and March (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Port Bolivar, TX
- Average rainfall in September: 4.29"
The wettest month (with the highest rainfall) is September (4.29").
The driest months (with the least rainfall) are February and March (0.75").
Average rainfall days in September
Port Bolivar, TX
- Average rainfall days in September: 19.9 days
The month with the highest number of rainy days is September (19.9 days).
The month with the least rainy days is January (10.1 days).
Average snowfall days in September
Port Bolivar, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Port Bolivar, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Port Bolivar, TX
- Average sunshine days in September: 8.5 days
The month with the most sunshine days is January (18.2 days).
The month with the least sunshine days is August (8.3 days).
Average UV index in September
Port Bolivar, 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
Port Bolivar, TX
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June, July, August and October (Cloud cover 26).
Average visibility in September
Port Bolivar, 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).
Port Bolivar, Texas, USA
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