September weather forecast
Zephyr, TX

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Weather in September

The first month of the autumn, September, is also a hot month in Zephyr, Texas, with an average temperature fluctuating between 87.4°F (30.8°C) and 68.9°F (20.5°C).

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from a very hot 95.7°F (35.4°C) in August to a tropical 87.4°F (30.8°C). In September, the recorded average low-temperature is a pleasant 68.9°F (20.5°C).

Heat index

The heat index for September is calculated to be a tropical 93.2°F (34°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.

Humidity

In September, the average relative humidity is 60%.

Rainfall

In Zephyr, in September, it is raining for 13.5 days, with typically 1.89" (48mm) of accumulated precipitation. In Zephyr, during the entire year, the rain falls for 115.7 days and collects up to 19.96" (507mm) of precipitation.

Snowfall

April through November are months without snowfall in Zephyr.

Daylight

In Zephyr, the average length of the day in September is 12h and 21min.
On the first day of September, sunrise is at 7:11 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:20 pm CDT.

Sunshine

In Zephyr, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 during September translates into the following recommendations:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

The high-temperature, in September, in Zephyr, records 87.4°F (30.8°C), while the low-temperature is 68.9°F (20.5°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 93.2°F (34°C).

What is the average humidity in September?

In September, the average relative humidity is 60%.

How many days does it rain in September?

In Zephyr, in September, it is raining for 13.5 days, with typically 1.89" (48mm) of accumulated precipitation.

When it does not snow?

April through November are months without snowfall.

What is the average length of the day in September?

In Zephyr, the average day length in September is 12h and 21min.

What time are sunrise and sunset in September in Zephyr?

On the first day of September, sunrise is at 7:11 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:20 pm CDT.

How many hours of sunshine does Zephyr have in September?

The average sunshine duration in September is 8.7h.

What is the UV index reading in September?

In Zephyr, Texas, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to 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
Zephyr, TX

Average temperature in September - Zephyr, TX
  • Average high temperature in September: 87.4°F

The warmest month (with the highest average high temperature) is August (95.7°F).
The months with the lowest average high temperature are January and December (58.1°F).

  • Average low temperature in September: 68.9°F

The month with the highest average low temperature is August (74.8°F).
The coldest month (with the lowest average low temperature) is January (39°F).

Average pressure in September
Zephyr, TX

Average pressure in September - Zephyr, TX
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in September
Zephyr, TX

Average wind speed in September - Zephyr, TX
  • Average wind speed in September: 8.3mph

The windiest month (with the highest average wind speed) is April (12.1mph).
The calmest month (with the lowest average wind speed) is September (8.3mph).

Average humidity in September
Zephyr, TX

Average humidity in September - Zephyr, TX
  • Average humidity in September: 60%

The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is August (51%).

Average rainfall in September
Zephyr, TX

Average rainfall in September - Zephyr, TX
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is January (0.94").

Average rainfall days in September
Zephyr, TX

Average rainfall days in September - Zephyr, TX
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (5.4 days).

Average snowfall in September
Zephyr, TX

Average snowfall in September - Zephyr, TX
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Zephyr, TX

Average snowfall days in September - Zephyr, TX
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Zephyr, TX
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • 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 54min).

Average sunshine days in September
Zephyr, TX

Average sunshine days in September - Zephyr, TX
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is January (23.8 days).
The month with the least sunshine days is May (13.4 days).

Average UV index in September
Zephyr, TX

Average UV index in September - Zephyr, TX
  • Average UV index in September: 6

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

Average cloud cover in September
Zephyr, TX

Average cloud cover in September - Zephyr, TX
  • Average cloud cover in September: 28

The months with the most cloud cover are March and May (Cloud cover 34).
The month with the least cloud cover is August (Cloud cover 19).

Average visibility in September
Zephyr, TX

Average visibility in September - Zephyr, 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).

Zephyr, Texas, USA

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