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September Weather in Mankato, United States

Last updated: June 24, 2025

In Mankato, United States, the average temperature in September is a pleasant 18°C (65°F). Expect temperatures to range from a low of 2°C (36°F) to a high of 33°C (91°F). However, be prepared for some rainfall, as precipitation amounts can reach 142 mm (5.6 in) over about 10 days. With an average humidity level of 81%, the air can feel quite moist, adding to the region's unique climate experience.

September Temperature in Mankato

In September in Mankato, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Mankato an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.

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

The chart illustrates September temperature patterns in Mankato, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mankato, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec171633446072747165493424
Data source: Temperature data for Mankato 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 Mankato

In Mankato in September, the total precipitation amount is 142 mm (5.6 in) over the course of 10 days.

September Precipitation Trends in Mankato

The chart displays monthly precipitation patterns in Mankato, 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 Mankato, September typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec32356788130106121129142913343
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mankato

In Mankato in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

September Average Humidity in Mankato

This chart illustrates the average monthly humidity levels in Mankato, 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 Mankato is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mankato

In Mankato 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 Mankato.

Maximum UV Index Levels in Mankato for September

The chart shows the monthly maximum UV Index (UVI) for Mankato 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 Mankato typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35589101098532
Data source: Mankato 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 Mankato Compares to Other Months

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

This table compares monthly weather conditions in Mankato, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)32 mm (1.3 inches)87%moderate
February Weather-9°C (16°F)35 mm (1.4 inches)90%moderate
March Weather1°C (34°F)67 mm (2.6 inches)85%moderate
April Weather7°C (44°F)88 mm (3.5 inches)84%very high
May Weather15°C (60°F)130 mm (5.1 inches)78%very high
June Weather22°C (72°F)106 mm (4.2 inches)80%very high
July Weather24°C (75°F)121 mm (4.8 inches)81%very high
August Weather22°C (71°F)128 mm (5.1 inches)81%very high
September Weather18°C (65°F)142 mm (5.6 inches)81%very high
October Weather9°C (49°F)91 mm (3.6 inches)84%moderate
November Weather1°C (34°F)33 mm (1.3 inches)88%moderate
December Weather-4°C (25°F)43 mm (1.7 inches)84%low

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