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September Weather in Mankato, United States

Last updated: June 24, 2025

In September, the average temperature in Mankato, United States hovers around 22°C (72°F), with minimums dipping to 4°C (40°F) and maximums soaring to 38°C (100°F). Expect precipitation of about 65 mm (2.6 in) over the course of 5 days, contributing to an average humidity of 73%. Enjoy the diverse climate!

September Temperature in Mankato

In September in Mankato, the average temperature is 22°C (72°F). Maximums can reach 38°C (100°F), and minimums can be as low as 4°C (40°F). This wide range of temperatures makes it essential for travelers to pack accordingly for both warm and cool conditions.

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 22°C (72°F), with highs reaching up to 38°C (100°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec292944526477817772544334
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 precipitation amount is 65 mm (2.6 in) over a period of 5 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 65 mm (2.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2522774517671729965762040
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 73%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, so it's best to stay hydrated and take frequent breaks while exploring.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
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-2°C (29°F)25 mm (1.0 inches)74%moderate
February Weather-2°C (30°F)21 mm (0.8 inches)78%moderate
March Weather6°C (44°F)77 mm (3.0 inches)67%high
April Weather11°C (53°F)45 mm (1.8 inches)70%very high
May Weather18°C (64°F)176 mm (6.9 inches)82%very high
June Weather25°C (78°F)71 mm (2.8 inches)81%extreme
July Weather27°C (81°F)72 mm (2.8 inches)80%extreme
August Weather25°C (77°F)99 mm (3.9 inches)80%very high
September Weather22°C (72°F)65 mm (2.6 inches)73%very high
October Weather12°C (55°F)76 mm (3.0 inches)71%high
November Weather6°C (43°F)20 mm (0.8 inches)79%moderate
December Weather1°C (34°F)39 mm (1.6 inches)83%moderate

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