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September Weather in Addison, United States

Last updated: June 24, 2025

In Addison, United States, the average temperature in September hovers around 17°C (63°F). Expect lows of 1°C (34°F) and highs reaching up to 31°C (89°F). This month sees an average precipitation of 88 mm (3.5 in), spread over 8 days, contributing to a humidity level of 66%. Prepare for a mix of mild warmth and occasional rain!

September Temperature in Addison

In September in Addison, the average temperature is 17°C (63°F). The maximum can reach 31°C (89°F), while the minimum can drop as low as 1°C (34°F). Be prepared for a range of temperatures, making it essential to pack layers for your travels.

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 (63°F), with highs reaching up to 31°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec262835465866716963533831
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 88 mm (3.5 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 88 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec6481741061169211877891177679
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 66%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making travel refreshing yet slightly muggy, perfect for leisurely strolls or picturesque outdoor explorations, but travelers should be prepared for occasional discomfort as they navigate the vibrant sights.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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-3°C (26°F)64 mm (2.5 inches)87%moderate
February Weather-2°C (29°F)81 mm (3.2 inches)85%moderate
March Weather2°C (35°F)74 mm (2.9 inches)85%high
April Weather8°C (46°F)106 mm (4.2 inches)83%very high
May Weather14°C (58°F)116 mm (4.6 inches)75%very high
June Weather19°C (66°F)92 mm (3.6 inches)73%very high
July Weather22°C (72°F)118 mm (4.6 inches)65%very high
August Weather21°C (70°F)77 mm (3.0 inches)62%very high
September Weather17°C (63°F)88 mm (3.5 inches)66%very high
October Weather11°C (53°F)117 mm (4.6 inches)79%high
November Weather3°C (38°F)76 mm (3.0 inches)87%moderate
December Weather0°C (31°F)79 mm (3.1 inches)85%low

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