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September Weather in New Ulm, United States

Last updated: June 24, 2025

In September, the average temperature in New Ulm, United States hovers around 18°C (65°F). Visitors can expect temperatures to range from a cool 2°C (36°F) to a warm 33°C (92°F). With 128 mm (5.0 in) of precipitation spread over 10 days, it's wise to carry an umbrella. The air is quite humid, boasting an impressive 81% average humidity, making it a uniquely atmospheric month!

September Temperature in New Ulm

In September, in New Ulm, the average temperature is 18°C (65°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 2°C (36°F). This temperature range makes New Ulm an ideal destination for travelers seeking both warm days and cool nights.

September Weather in New Ulm: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in New Ulm, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Ulm, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec171634446072747165493425
Data source: Temperature data for New Ulm 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 New Ulm

In New Ulm in September, the total precipitation amount is 128 mm (5.0 in) recorded over a span of 10 days.

September Precipitation Trends in New Ulm

The chart displays monthly precipitation patterns in New Ulm, 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 New Ulm, September typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec30316484130109123113128963241
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in New Ulm

In New Ulm 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 New Ulm

This chart illustrates the average monthly humidity levels in New Ulm, 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 New Ulm 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 New Ulm

In New Ulm 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 New Ulm.

Maximum UV Index Levels in New Ulm for September

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

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

This table compares monthly weather conditions in New Ulm, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)30 mm (1.2 inches)87%moderate
February Weather-9°C (16°F)31 mm (1.2 inches)90%moderate
March Weather1°C (34°F)64 mm (2.5 inches)85%moderate
April Weather7°C (44°F)84 mm (3.3 inches)84%very high
May Weather15°C (60°F)130 mm (5.1 inches)78%very high
June Weather22°C (73°F)109 mm (4.3 inches)80%very high
July Weather24°C (75°F)123 mm (4.8 inches)81%very high
August Weather22°C (71°F)113 mm (4.4 inches)81%very high
September Weather18°C (65°F)128 mm (5.0 inches)81%very high
October Weather9°C (49°F)96 mm (3.8 inches)84%moderate
November Weather1°C (35°F)32 mm (1.3 inches)88%moderate
December Weather-4°C (25°F)41 mm (1.6 inches)84%low

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