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September Weather in Dubuque, United States

Last updated: June 24, 2025

In September, the average temperature in Dubuque, United States hovers around a pleasant 19°C (66°F). Expect fluctuations between a minimum of 4°C (39°F) and a maximum of 33°C (92°F). During this time, anticipate about 118 mm (4.7 in) of precipitation spread across 10 days, coupled with an average humidity level of 74%.

September Temperature in Dubuque

In September in Dubuque, the average temperature is 19°C (66°F). Maximums can reach 33°C (92°F), while minimums can drop as low as 4°C (39°F). Be sure to pack a mix of clothing to enjoy both warm days and cooler nights during your travels!

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

The chart illustrates September temperature patterns in Dubuque, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dubuque, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec212337476172757266523730
Data source: Temperature data for Dubuque 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 Dubuque

In Dubuque in September, the precipitation amount is 118 mm (4.7 in) over a span of 10 days.

September Precipitation Trends in Dubuque

The chart displays monthly precipitation patterns in Dubuque, 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 Dubuque, September typically receives around 118 mm (4.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4861648615013692891181194643
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Dubuque

In Dubuque in September humidity is 74%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it ideal for leisurely outdoor exploration but potentially heavy for those not accustomed to tropical conditions.

September Average Humidity in Dubuque

This chart illustrates the average monthly humidity levels in Dubuque, 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 Dubuque is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%84%83%75%79%75%69%74%79%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Dubuque

In Dubuque 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 Dubuque.

Maximum UV Index Levels in Dubuque for September

The chart shows the monthly maximum UV Index (UVI) for Dubuque 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 Dubuque typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Dubuque 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 Dubuque Compares to Other Months

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

This table compares monthly weather conditions in Dubuque, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)48 mm (1.9 inches)84%moderate
February Weather-5°C (23°F)61 mm (2.4 inches)85%moderate
March Weather3°C (37°F)64 mm (2.5 inches)84%high
April Weather8°C (47°F)86 mm (3.4 inches)83%very high
May Weather16°C (61°F)150 mm (5.9 inches)75%very high
June Weather22°C (72°F)136 mm (5.4 inches)79%very high
July Weather24°C (76°F)92 mm (3.6 inches)75%very high
August Weather22°C (72°F)89 mm (3.5 inches)69%very high
September Weather19°C (66°F)118 mm (4.7 inches)74%very high
October Weather11°C (52°F)119 mm (4.7 inches)79%moderate
November Weather3°C (37°F)46 mm (1.8 inches)88%moderate
December Weather-1°C (30°F)43 mm (1.7 inches)82%low

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