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September Weather in Marengo, United States

Last updated: June 24, 2025

In Marengo, United States, the average temperature in September is a pleasant 22°C (72°F). However, expect a range, as temperatures can dip to a minimum of 8°C (47°F) and soar to a maximum of 36°C (96°F). This month, you'll encounter precipitation with an average of 104 mm (4.1 in) spread over 8 days. Don't forget to prepare for a humidity level averaging 69%!

September Temperature in Marengo

In September in Marengo, the average temperature is 22°C (72°F), with maximum temperatures potentially reaching 36°C (96°F) and minimums dipping as low as 8°C (47°F). This makes it an ideal time for travelers seeking pleasant weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Marengo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marengo, September typically has an average temperature of 22°C (72°F), with highs reaching up to 36°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec353947556775797672604540
Data source: Temperature data for Marengo 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 Marengo

In Marengo, in September, the precipitation amount is 104 mm (4.1 in) over a span of 8 days.

September Precipitation Trends in Marengo

The chart displays monthly precipitation patterns in Marengo, 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 Marengo, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec89127136135139146989310410694108
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Marengo

In Marengo in September, humidity is 69%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket, making travel feel sticky and slightly oppressive, yet also invigorating as the air is thick with the scent of blooming flora and vibrant surroundings.

September Average Humidity in Marengo

This chart illustrates the average monthly humidity levels in Marengo, 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 Marengo is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Marengo

In Marengo 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 Marengo.

Maximum UV Index Levels in Marengo for September

The chart shows the monthly maximum UV Index (UVI) for Marengo 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 Marengo typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35710101110109643
Data source: Marengo 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 Marengo Compares to Other Months

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

This table compares monthly weather conditions in Marengo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)89 mm (3.5 inches)87%moderate
February Weather4°C (39°F)127 mm (5.0 inches)85%moderate
March Weather9°C (48°F)136 mm (5.4 inches)86%high
April Weather13°C (56°F)135 mm (5.3 inches)84%very high
May Weather20°C (67°F)139 mm (5.5 inches)79%very high
June Weather24°C (75°F)146 mm (5.8 inches)82%extreme
July Weather26°C (79°F)98 mm (3.9 inches)79%very high
August Weather25°C (76°F)93 mm (3.7 inches)70%very high
September Weather22°C (72°F)104 mm (4.1 inches)69%very high
October Weather16°C (60°F)106 mm (4.2 inches)76%high
November Weather7°C (45°F)94 mm (3.7 inches)88%moderate
December Weather5°C (41°F)108 mm (4.3 inches)87%moderate

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