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September Weather in Plano, United States

Last updated: June 24, 2025

In Plano, United States, the average temperature in September hovers around 20°C (68°F), with the mercury dipping as low as 3°C (37°F) and soaring up to 34°C (93°F). During this month, expect 102 mm (4.0 in) of precipitation spread over 9 days, while the average humidity sits at a comfortable 80%.

September Temperature in Plano

In September, in Plano, the average temperature is 20°C (68°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 3°C (37°F). This makes Plano a great destination for travelers looking to enjoy mild weather with the possibility of warm afternoons and cool evenings.

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

The chart illustrates September temperature patterns in Plano, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plano, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec252739486172757267543932
Data source: Temperature data for Plano 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 Plano

In Plano in September, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

September Precipitation Trends in Plano

The chart displays monthly precipitation patterns in Plano, 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 Plano, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec636186117157139112811021295652
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Plano

In Plano in September, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

September Average Humidity in Plano

This chart illustrates the average monthly humidity levels in Plano, 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 Plano is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Plano

In Plano in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Plano.

Maximum UV Index Levels in Plano for September

The chart shows the monthly maximum UV Index (UVI) for Plano 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 Plano typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Plano 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 Plano Compares to Other Months

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

This table compares monthly weather conditions in Plano, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)63 mm (2.5 inches)82%moderate
February Weather-3°C (27°F)61 mm (2.4 inches)83%moderate
March Weather4°C (40°F)86 mm (3.4 inches)84%high
April Weather9°C (49°F)117 mm (4.6 inches)85%very high
May Weather16°C (61°F)157 mm (6.2 inches)79%very high
June Weather22°C (72°F)139 mm (5.5 inches)82%very high
July Weather24°C (75°F)112 mm (4.4 inches)80%very high
August Weather22°C (73°F)81 mm (3.2 inches)81%very high
September Weather20°C (68°F)102 mm (4.0 inches)80%very high
October Weather12°C (54°F)128 mm (5.1 inches)82%high
November Weather4°C (39°F)56 mm (2.2 inches)88%moderate
December Weather0°C (33°F)52 mm (2.0 inches)84%low

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