September weather forecast
Santo Tomas, TX

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Weather in September

The first month of the autumn, September, is still a hot month in Santo Tomas, Texas, with an average temperature fluctuating between 76.1°F (24.5°C) and 92.5°F (33.6°C).

Temperature

The onset of September brings a small shift in high-temperatures, falling from a very hot 100°F (37.8°C) in August to a tropical 92.5°F (33.6°C). The mean low-temperature during September nights is a moderately hot 76.1°F (24.5°C).

Heat index

The heat index in September is appraised at an extremely hot 105.8°F (41°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In Santo Tomas, Texas, the average relative humidity in September is 60%.

Rainfall

The month with the most rainfall is September, when the rain falls for 12.9 days and typically aggregates up to 2.17" (55mm) of precipitation.

Snowfall

In Santo Tomas, snow does not fall in March through November.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:18 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:25 pm CDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Fend off overexposure. Sun protection is vital. 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. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

In Santo Tomas, in September, the average high-temperature is 92.5°F (33.6°C), and the average low-temperature is 76.1°F (24.5°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is appraised at 105.8°F (41°C).

What is the average humidity in September?

The average relative humidity in September is 60%.

What is the wettest month?

The month with the most rainfall is September, when the rain falls for 12.9 days and typically aggregates up to 2.17" (55mm) of precipitation.

How much does it rain in September?

In Santo Tomas, in September, during 12.9 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

When it does not snow?

March through November are months without snowfall.

What is the average length of the day in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:18 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:25 pm CDT.

How long on average sun shines in September in Santo Tomas?

The average sunshine duration in September is 8.6h.

How high is the UV index in September?

In Santo Tomas, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Santo Tomas, TX

Average temperature in September - Santo Tomas, TX
  • Average high temperature in September: 92.5°F

The warmest month (with the highest average high temperature) is August (100°F).
The month with the lowest average high temperature is January (66.9°F).

  • Average low temperature in September: 76.1°F

The month with the highest average low temperature is August (79.9°F).
The coldest month (with the lowest average low temperature) is January (50.2°F).

Average pressure in September
Santo Tomas, TX

Average pressure in September - Santo Tomas, 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 (29.86"Hg).

Average wind speed in September
Santo Tomas, TX

Average wind speed in September - Santo Tomas, TX
  • Average wind speed in September: 10mph

The windiest month (with the highest average wind speed) is July (13.5mph).
The calmest month (with the lowest average wind speed) is December (8.9mph).

Average humidity in September
Santo Tomas, TX

Average humidity in September - Santo Tomas, TX
  • Average humidity in September: 60%

The month with the highest relative humidity is December (62%).
The month with the lowest relative humidity is August (49%).

Average rainfall in September
Santo Tomas, TX

Average rainfall in September - Santo Tomas, TX
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is September (2.17").
The driest month (with the least rainfall) is February (0.43").

Average rainfall days in September
Santo Tomas, TX

Average rainfall days in September - Santo Tomas, TX
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is September (12.9 days).
The month with the least rainy days is November (5.5 days).

Average snowfall days in September
Santo Tomas, TX

Average snowfall days in September - Santo Tomas, TX
  • Average snowfall days in September: 0 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, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
Santo Tomas, TX

Average daylight in September / Average sunshine in September - Santo Tomas, 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 12min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

Average sunshine days in September
Santo Tomas, TX

Average sunshine days in September - Santo Tomas, TX
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is January (23.3 days).
The month with the least sunshine days is September (15.1 days).

Average UV index in September
Santo Tomas, TX

Average UV index in September - Santo Tomas, TX
  • Average UV index in September: 7

The months with the highest UV index are July and August (UV index 8).
The months with the lowest UV index are January and December (UV index 4).

Average cloud cover in September
Santo Tomas, TX

Average cloud cover in September - Santo Tomas, TX
  • Average cloud cover in September: 30

The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 17).

Average visibility in September
Santo Tomas, TX

Average visibility in September - Santo Tomas, 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).

Santo Tomas, Texas, USA

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