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September Weather in Madison, United States

Last updated: June 24, 2025

In September, the average temperature in Madison, United States is a comfortable 18°C (64°F). However, temperatures can vary significantly, with lows of 3°C (37°F) and highs of 32°C (90°F). Prepare for some rainy days, as 108 mm (4.3 in) of precipitation is expected over 9 days. Don't forget to stay hydrated—average humidity levels hover around 75%!

September Temperature in Madison

In September in Madison, the average temperature is 18°C (64°F), with maximums reaching 32°C (90°F) and minimums dropping as low as 3°C (37°F). This diverse temperature range makes it a great time for travelers to prepare for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Madison, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Madison, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec181733435771747064473425
Data source: Temperature data for Madison 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 Madison

In Madison in September, the precipitation amount is 108 mm (4.3 in) spread over 9 days.

September Precipitation Trends in Madison

The chart displays monthly precipitation patterns in Madison, 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 Madison, September typically receives around 108 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec202260741088198116108782736
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Madison

In Madison in September, humidity is 75%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making your travels a bit sticky and requiring frequent breaks in the shade to stay comfortable.

September Average Humidity in Madison

This chart illustrates the average monthly humidity levels in Madison, 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 Madison is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%84%75%79%74%81%82%80%75%77%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Madison

In Madison 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 Madison.

Maximum UV Index Levels in Madison for September

The chart shows the monthly maximum UV Index (UVI) for Madison 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 Madison typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25589111098532
Data source: Madison 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 Madison Compares to Other Months

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

This table compares monthly weather conditions in Madison, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)20 mm (0.8 inches)80%low
February Weather-8°C (18°F)22 mm (0.9 inches)84%moderate
March Weather1°C (33°F)60 mm (2.4 inches)75%moderate
April Weather6°C (43°F)74 mm (2.9 inches)79%very high
May Weather14°C (58°F)108 mm (4.3 inches)74%very high
June Weather22°C (72°F)81 mm (3.2 inches)81%extreme
July Weather23°C (74°F)98 mm (3.9 inches)82%very high
August Weather21°C (70°F)116 mm (4.6 inches)80%very high
September Weather18°C (64°F)108 mm (4.3 inches)75%very high
October Weather8°C (47°F)78 mm (3.1 inches)77%moderate
November Weather1°C (34°F)27 mm (1.1 inches)85%moderate
December Weather-4°C (25°F)35 mm (1.4 inches)83%low

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