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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 24°C (76°F), with a comfortable average humidity of 64%. Nighttime can dip to a cool 11°C (51°F), while daytime highs can soar up to 36°C (98°F). Expect about 103 mm (4.1 in) of rainfall spread over 8 days, so be prepared for occasional showers amidst the warmth!

September Temperature in Addison

In September in Addison, the average temperature is 24°C (76°F), with maximums reaching up to 36°C (98°F) and minimums dropping as low as 11°C (51°F). This range makes it an ideal time for travelers to enjoy both warm days and cooler evenings.

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 24°C (76°F), with highs reaching up to 36°C (98°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec445056627177807975665148
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 103 mm (4.1 in) over a span 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 103 mm (4.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec11319217315611815211312610412073158
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 64%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace, making travel slightly uncomfortable but still enjoyable, as you may find yourself yearning for a refreshing breeze or a quick dip in the water.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109754
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 Weather7°C (45°F)113 mm (4.5 inches)87%moderate
February Weather10°C (50°F)192 mm (7.6 inches)87%high
March Weather14°C (57°F)173 mm (6.8 inches)85%very high
April Weather16°C (62°F)156 mm (6.1 inches)82%very high
May Weather22°C (71°F)118 mm (4.6 inches)83%extreme
June Weather25°C (77°F)152 mm (6.0 inches)82%extreme
July Weather27°C (80°F)112 mm (4.4 inches)78%extreme
August Weather26°C (80°F)126 mm (4.9 inches)67%very high
September Weather24°C (76°F)103 mm (4.1 inches)64%very high
October Weather19°C (66°F)120 mm (4.7 inches)74%high
November Weather11°C (51°F)73 mm (2.9 inches)87%moderate
December Weather9°C (48°F)158 mm (6.2 inches)88%moderate

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