September weather forecast
Three Rivers, TX

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Weather in September

The first month of the autumn, September, is still a hot month in Three Rivers, Texas, with temperature in the range of an average high of 90.5°F (32.5°C) and an average low of 73.9°F (23.3°C).

Temperature

The arrival of September corresponds with a light shift in temperature, down from a sweltering 97.5°F (36.4°C) in August to a hot 90.5°F (32.5°C). Three Rivers observes an average nighttime low-temperature of 73.9°F (23.3°C) during the month of September.

Heat index

In September, the average heat index is appraised at an extremely hot 105.8°F (41°C). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

In Three Rivers, the average relative humidity in September is 68%.

Rainfall

In Three Rivers, in September, it is raining for 13.4 days, with typically 1.26" (32mm) of accumulated precipitation. In Three Rivers, Texas, during the entire year, the rain falls for 102.4 days and collects up to 8.78" (223mm) of precipitation.

Snowfall

In Three Rivers, snow does not fall in January, March through December.

Daylight

In September, the average length of the day in Three Rivers is 12h and 19min.
On the first day of the month, sunrise is at 7:11 am and sunset at 7:53 pm. On the last day of September, in Three Rivers, Texas, sunrise is at 7:25 am and sunset at 7:19 pm CDT.

Sunshine

In Three Rivers, the average sunshine in September is 8.4h.

UV index

In Three Rivers, Texas, the average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, an average UV index of 7 transforms into the following instructions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
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Frequently asked questions

How hot does it get in Three Rivers in September?

In September, in Three Rivers, the average high-temperature is 90.5°F (32.5°C), and the average low-temperature is 73.9°F (23.3°C). The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in September is appraised at 105.8°F (41°C).

What is the average humidity in September in Three Rivers?

In September, the average relative humidity in Three Rivers is 68%.

How many days does it rain in September in Three Rivers?

In September, in Three Rivers, the rain falls for 13.4 days. Throughout September, 1.26" (32mm) of precipitation is accumulated.

When it does not snow in Three Rivers?

In Three Rivers, Texas, snow does not fall in January, March through December.

What is the average length of the day in September in Three Rivers?

In Three Rivers, Texas, the average day length in September is 12h and 19min.

When is the sunrise / sunset in September in Three Rivers?

On the first day of September in Three Rivers, Texas, sunrise is at 7:11 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:19 pm CDT.

How long on average sun shines in September in Three Rivers?

The average sunshine duration in September in Three Rivers is 8.4h.

What is the UV index intensity in September in Three Rivers?

The average daily maximum UV index in September in Three Rivers, Texas, is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
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
Three Rivers, TX

Average temperature in September - Three Rivers, TX
  • Average high temperature in September: 90.5°F

The warmest month (with the highest average high temperature) is August (97.5°F).
The month with the lowest average high temperature is January (64°F).

  • Average low temperature in September: 73.9°F

The month with the highest average low temperature is August (77.5°F).
The coldest month (with the lowest average low temperature) is January (47.3°F).

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Average pressure in September
Three Rivers, TX

Average pressure in September - Three Rivers, TX
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in September
Three Rivers, TX

Average wind speed in September - Three Rivers, TX
  • Average wind speed in September: 7.8mph

The windiest month (with the highest average wind speed) is May (10.8mph).
The calmest month (with the lowest average wind speed) is September (7.8mph).

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Average humidity in September
Three Rivers, TX

Average humidity in September - Three Rivers, TX
  • Average humidity in September: 68%

The months with the highest relative humidity are March and May (73%).
The month with the lowest relative humidity is August (62%).

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Average rainfall in September
Three Rivers, TX

Average rainfall in September - Three Rivers, TX
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is May (1.34").
The driest month (with the least rainfall) is February (0.24").

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Average rainfall days in September
Three Rivers, TX

Average rainfall days in September - Three Rivers, TX
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is September (13.4 days).
The month with the least rainy days is January (6.3 days).

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Average snowfall in September
Three Rivers, TX

Average snowfall in September - Three Rivers, TX
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Three Rivers, TX

Average snowfall days in September - Three Rivers, 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, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Three Rivers, TX

Average daylight in September / Average sunshine in September - Three Rivers, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

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Average sunshine days in September
Three Rivers, TX

Average sunshine days in September - Three Rivers, TX
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is January (23.3 days).
The month with the least sunshine days is September (14.5 days).

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Average UV index in September
Three Rivers, TX

Average UV index in September - Three Rivers, TX
  • Average UV index in September: 7

The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Three Rivers, TX

Average cloud cover in September - Three Rivers, TX
  • Average cloud cover in September: 32

The months with the most cloud cover are February, March and December (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in September
Three Rivers, TX

Average visibility in September - Three Rivers, 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).

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Three Rivers, Texas, USA

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