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September Weather in Ulm, United States

Last updated: June 24, 2025

In Ulm, United States, the average temperature in September is a comfortable 15°C (59°F). However, be prepared for a temperature range where the minimum can drop to -2°C (28°F) and the maximum can soar to 35°C (95°F). During this time, expect about 38 mm (1.5 in) of precipitation over approximately 6 days, and enjoy an average humidity level of 68% to complete the experience.

September Temperature in Ulm

In September in Ulm, the average temperature is 15°C (59°F). The maximum can reach 35°C (95°F), while the minimum can drop to as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for a comfortable visit.

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

The chart illustrates September temperature patterns in Ulm, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ulm, September typically has an average temperature of 15°C (59°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec261933425463726959443629
Data source: Temperature data for 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 Ulm

In Ulm in September, the total precipitation amount is 38 mm (1.5 in) spread over 6 days.

September Precipitation Trends in Ulm

The chart displays monthly precipitation patterns in 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 Ulm, September typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec153925597177122438372926
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ulm

In Ulm in September, humidity is 68%. With an average temperature of 15°C (59°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls and sightseeing, but travelers should be prepared for occasional discomfort as the mugginess can dampen outdoor activities.

September Average Humidity in Ulm

This chart illustrates the average monthly humidity levels in 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 Ulm is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%88%83%78%76%78%77%71%68%72%84%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ulm

In Ulm in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Ulm.

Maximum UV Index Levels in Ulm for September

The chart shows the monthly maximum UV Index (UVI) for 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 Ulm typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: 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 Ulm Compares to Other Months

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

This table compares monthly weather conditions in Ulm, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)15 mm (0.6 inches)87%low
February Weather-7°C (19°F)39 mm (1.6 inches)88%moderate
March Weather1°C (34°F)25 mm (1.0 inches)83%moderate
April Weather5°C (42°F)59 mm (2.3 inches)78%high
May Weather12°C (54°F)71 mm (2.8 inches)76%very high
June Weather17°C (64°F)77 mm (3.0 inches)78%very high
July Weather22°C (72°F)12 mm (0.5 inches)77%very high
August Weather21°C (69°F)24 mm (0.9 inches)71%very high
September Weather15°C (59°F)38 mm (1.5 inches)68%high
October Weather7°C (44°F)37 mm (1.5 inches)72%moderate
November Weather2°C (36°F)29 mm (1.2 inches)84%moderate
December Weather-2°C (29°F)26 mm (1.0 inches)90%low

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