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
High Island marks the onset of September with an average high-temperature of a still hot 86.4°F (30.2°C), a subtle shift from August's 91°F (32.8°C). During September, the average low-temperature is a moderately hot 73.8°F (23.2°C).Heat index
September's average heat index is appraised at a very hot 98.6°F (37°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In September, the average relative humidity is 77%.Rainfall
The month with the most rainfall is September, when the rain falls for 17.6 days and typically aggregates up to 2.01" (51mm) of precipitation.Snowfall
In High Island, Texas, snow does not fall in January through November.Daylight
In High Island, the average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 6:55 am and sunset at 7:39 pm. On the last day of September, in High Island, sunrise is at 7:10 am and sunset at 7:03 pm CDT.
Sunshine
In September, the average sunshine in High Island, Texas, is 9.3h.UV index
In September, the average daily maximum UV index in High Island is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
Is it hot in High Island during September?
What is the average humidity in September in High Island?
What is the rainiest month in High Island?
How many days does it rain in September in High Island?
When it does not snow in High Island?
How many hours of daylight does High Island have in September?
When is the sunrise / sunset in September in High Island?
How many hours of sunshine does High Island have in September?
What is the UV index reading in September in High Island?
Average temperature in September
High Island, TX
- Average high temperature in September: 86.4°F
The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is January (59.5°F).
- Average low temperature in September: 73.8°F
The month with the highest average low temperature is July (77.9°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).
Average pressure in September
High Island, 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
High Island, TX
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest months (with the lowest average wind speed) are August and September (6.6mph).
Average humidity in September
High Island, TX
- Average humidity in September: 77%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
High Island, TX
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is September (2.01").
The driest months (with the least rainfall) are February and March (0.43").
Average rainfall days in September
High Island, TX
- Average rainfall days in September: 17.6 days
The month with the highest number of rainy days is September (17.6 days).
The month with the least rainy days is February (6.5 days).
Average snowfall in September
High Island, TX
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
High Island, TX
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, October and November (0 days).
Average daylight in September /
Average sunshine in September
High Island, 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: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
High Island, TX
- Average sunshine days in September: 9.7 days
The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is August (9.3 days).
Average UV index in September
High Island, 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 3).
Average cloud cover in September
High Island, TX
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
High Island, 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).
High Island, Texas, USA
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