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September Weather in Lewisville, United States

Last updated: June 24, 2025

In September, the average temperature in Lewisville, United States is a pleasant 23°C (73°F), with minimums dipping to 6°C (43°F) and maximums rising to a warm 36°C (96°F). Expect about 136 mm (5.4 in) of precipitation over approximately 10 days, contributing to an average humidity level of 75%. Prepare for a diverse weather experience!

September Temperature in Lewisville

In September in Lewisville, the average temperature is 23°C (73°F), with maximums reaching up to 36°C (96°F) and minimums dropping as low as 6°C (43°F). This variability makes it essential for travelers to pack for both warm and cool conditions.

September Weather in Lewisville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Lewisville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewisville, September typically has an average temperature of 23°C (73°F), with highs reaching up to 36°C (96°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec414652606975807773634945
Data source: Temperature data for Lewisville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Lewisville

In Lewisville in September, the total precipitation amount is 136 mm (5.4 in) over a span of 10 days.

September Precipitation Trends in Lewisville

The chart displays monthly precipitation patterns in Lewisville, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Lewisville, September typically receives around 136 mm (5.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8311586117124918611413611686109
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lewisville

In Lewisville in September, humidity is 75%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel slightly uncomfortable yet invigorating as the air wraps around you, creating a sense of walking through a lush, tropical paradise.

September Average Humidity in Lewisville

This chart illustrates the average monthly humidity levels in Lewisville, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Lewisville is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lewisville

In Lewisville in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Lewisville.

Maximum UV Index Levels in Lewisville for September

The chart shows the monthly maximum UV Index (UVI) for Lewisville in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Lewisville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101110109853
Data source: Lewisville September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Lewisville Compares to Other Months

Weather in Lewisville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lewisville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Lewisville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)83 mm (3.3 inches)86%moderate
February Weather8°C (47°F)115 mm (4.5 inches)85%high
March Weather11°C (52°F)86 mm (3.4 inches)84%very high
April Weather16°C (60°F)117 mm (4.6 inches)82%very high
May Weather20°C (69°F)124 mm (4.9 inches)83%very high
June Weather24°C (76°F)91 mm (3.6 inches)82%extreme
July Weather27°C (80°F)86 mm (3.4 inches)80%very high
August Weather25°C (78°F)114 mm (4.5 inches)74%very high
September Weather23°C (73°F)136 mm (5.4 inches)75%very high
October Weather17°C (64°F)116 mm (4.6 inches)79%very high
November Weather9°C (49°F)86 mm (3.4 inches)87%moderate
December Weather7°C (45°F)109 mm (4.3 inches)87%moderate

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