September weather forecast
Rockport, TX

englishespañol中文
Share

Weather in September

In Rockport, Texas, September represents the transition from sultry summer to the comfortable fall. A significant drop in temperature can be experienced, signalling the impending arrival of cooler months. However, what sets September apart is its maximum rainfall of 3.31" (84mm), making it the wettest month of the year. Despite the increased rainfall, the sea retains its warmth, offering an interesting contrast for beach activities. All in all, September offers an interesting mix of weather conditions - a retreat from the intensifying heat, yet with a touch of summer's end.

Temperature

September's onset records a minor alteration in the average high-temperature to a moderately hot 85.6°F (29.8°C) from August's 88.3°F (31.3°C). Nighttime, during September, brings an average low of 78.4°F (25.8°C), a modest reduction from the day's peak.

Heat index

The heat index for September is evaluated at a very hot 96.8°F (36°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', joins air temperature with relative humidity to produce a temperature perception for humans. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. 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 highly critical to babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The average relative humidity in September in Rockport is 75%.

Rainfall

September is the month with the most rainfall in Rockport. Rain falls for 18 days and accumulates 3.31" (84mm) of precipitation.

Snowfall

January, March through November are months without snowfall.

Ocean temperature

In Rockport, Texas, in September, the average water temperature is 84.7°F (29.3°C).
Note: Water temperatures ranging between 77°F (25°C) and 84.2°F (29°C) are regarded as very warm, making swimming, diving, and similar water activities pleasurable for extended periods.

Daylight

In September, the average length of the day 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 Rockport, the average sunshine in September is 8.6h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The daily high UV index of 7 in September translates into this advice:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take heed! Reflections of sand and water make the Sun's UV rays stronger.
[Resources]

Frequently asked questions

How hot is it in Rockport in September?

The high-temperature during September is 85.6°F (29.8°C) and the low-temperature is 78.4°F (25.8°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is evaluated at 96.8°F (36°C).

What is the average humidity in September in Rockport?

In September, the average relative humidity is 75%.

What is the rainiest month in Rockport?

September is the month with the most rainfall in Rockport. Rain falls for 18 days and accumulates 3.31" (84mm) of precipitation.

How much does it rain in Rockport in September?

In Rockport, in September, it is raining for 18 days, with typically 3.31" (84mm) of accumulated precipitation.

When it does not snow in Rockport?

In Rockport, Texas, snow does not fall in January, March through November.

How warm is the water in September in Rockport?

In September, the average ocean temperature in Rockport, Texas, is 84.7°F (29.3°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Rockport?

In Rockport, the average day length in September is 12h and 19min.

When are sunrise and sunset in September in Rockport?

On the first day of September, 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.

How long on average sun shines in September in Rockport?

In September, the average sunshine duration in Rockport is 8.6h.

What is the month with the highest UV index in Rockport?

The months with the highest UV index in Rockport, Texas, are May through September, with an average maximum UV index of 7.

What is the UV index reading in September in Rockport?

The average daily maximum UV index in September in Rockport, Texas, is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Rockport, TX

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).

[Resources]

Average pressure in September
Rockport, TX

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).

[Resources]

Average wind speed in September
Rockport, TX

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).

[Resources]

Average humidity in September
Rockport, TX

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%).

[Resources]

Average rainfall in September
Rockport, TX

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").

[Resources]

Average rainfall days in September
Rockport, TX

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).

[Resources]

Average snowfall in September
Rockport, TX

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").

[Resources]

Average snowfall days in September
Rockport, TX

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).

[Resources]

Average sea temperature in September
Rockport, TX

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).

[Resources]

Average daylight in September /
Average sunshine in September
Rockport, TX

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).

[Resources]

Average sunshine days in September
Rockport, TX

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).

[Resources]

Average UV index in September
Rockport, TX

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).

[Resources]

Average cloud cover in September
Rockport, TX

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).

[Resources]

Average visibility in September
Rockport, TX

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).

[Resources]

Rockport, Texas, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location