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September Weather in Addison, United States

Last updated: June 24, 2025

In September, the average temperature in Addison, United States is a pleasant 17°C (62°F). Visitors can expect a range from a chilly 0°C (32°F) to a warm 32°C (91°F). With 64 mm (2.5 in) of precipitation over about 8 days, it’s a good idea to pack an umbrella! On top of that, the average humidity hovers around 72%, adding a touch of tropical charm to your stay.

September Temperature in Addison

In September in Addison, the average temperature is 17°C (62°F). Maximums can reach 32°C (91°F), and minimums can dip as low as 0°C (32°F). This climate makes Addison a versatile destination for travelers, offering a mix of warm days and cooler nights ideal for outdoor activities.

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

The chart illustrates September temperature patterns in Addison, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Addison, September typically has an average temperature of 17°C (62°F), with highs reaching up to 32°C (91°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec212431445766716962513627
Data source: Temperature data for Addison 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 Addison

In Addison in September, the precipitation amount is 64 mm (2.5 in) over the course of 8 days.

September Precipitation Trends in Addison

The chart displays monthly precipitation patterns in Addison, 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 Addison, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec777767111878811095641319880
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Addison

In Addison in September humidity is 72%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially heavy on the skin, prompting travelers to seek shade during midday excursions.

September Average Humidity in Addison

This chart illustrates the average monthly humidity levels in Addison, 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 Addison is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Addison

In Addison in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Addison.

Maximum UV Index Levels in Addison for September

The chart shows the monthly maximum UV Index (UVI) for Addison 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 Addison typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Addison 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 Addison Compares to Other Months

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

This table compares monthly weather conditions in Addison, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)77 mm (3.0 inches)89%low
February Weather-4°C (24°F)77 mm (3.0 inches)88%moderate
March Weather0°C (31°F)67 mm (2.6 inches)86%moderate
April Weather7°C (44°F)111 mm (4.4 inches)84%very high
May Weather14°C (57°F)87 mm (3.4 inches)76%very high
June Weather19°C (66°F)88 mm (3.5 inches)72%very high
July Weather22°C (71°F)110 mm (4.3 inches)66%very high
August Weather21°C (69°F)95 mm (3.7 inches)64%very high
September Weather17°C (62°F)64 mm (2.5 inches)72%high
October Weather10°C (51°F)131 mm (5.2 inches)81%moderate
November Weather2°C (36°F)98 mm (3.9 inches)87%moderate
December Weather-3°C (27°F)80 mm (3.2 inches)84%low

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