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September Weather in Glen Ullin, United States

Last updated: June 24, 2025

In September, the average temperature in Glen Ullin, United States hovers around 16°C (60°F). Be prepared for a range, as temperatures can dip to a chilly -1°C (30°F) or climb to a sizzling 35°C (96°F). Expect about 51 mm (2.0 in) of rain over 6 days, contributing to an average humidity level of 69%. Stay comfortable and enjoy the dynamic weather!

September Temperature in Glen Ullin

In September in Glen Ullin, the average temperature is 16°C (60°F). The maximum can reach 35°C (96°F) and the minimum can be as low as -1°C (30°F). Travelers should be prepared for a wide temperature range, making layered clothing a smart choice for this time of year.

September Weather in Glen Ullin: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Glen Ullin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glen Ullin, September typically has an average temperature of 16°C (60°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec171430405568736960433123
Data source: Temperature data for Glen Ullin 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 Glen Ullin

In Glen Ullin in September, the precipitation amount is 51 mm (2.0 in) over the course of 6 days.

September Precipitation Trends in Glen Ullin

The chart displays monthly precipitation patterns in Glen Ullin, 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 Glen Ullin, September typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec121625286154617252511720
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glen Ullin

In Glen Ullin in September, humidity is 69%. With an average temperature of 16°C (60°F), this humidity feels like a gentle embrace that can make traveling a bit sticky, yet the mild warmth invites exploration, creating a comfortable atmosphere for leisurely strolls and outdoor adventures.

September Average Humidity in Glen Ullin

This chart illustrates the average monthly humidity levels in Glen Ullin, 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 Glen Ullin is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%88%78%75%76%79%78%78%69%71%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glen Ullin

In Glen Ullin 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 Glen Ullin.

Maximum UV Index Levels in Glen Ullin for September

The chart shows the monthly maximum UV Index (UVI) for Glen Ullin 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 Glen Ullin typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2459810997532
Data source: Glen Ullin 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 Glen Ullin Compares to Other Months

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

This table compares monthly weather conditions in Glen Ullin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)12 mm (0.5 inches)84%low
February Weather-10°C (14°F)16 mm (0.6 inches)88%moderate
March Weather-1°C (31°F)25 mm (1.0 inches)78%moderate
April Weather4°C (40°F)28 mm (1.1 inches)75%very high
May Weather13°C (55°F)61 mm (2.4 inches)76%very high
June Weather20°C (68°F)54 mm (2.1 inches)79%very high
July Weather23°C (73°F)61 mm (2.4 inches)78%very high
August Weather21°C (70°F)72 mm (2.8 inches)78%very high
September Weather16°C (60°F)51 mm (2.0 inches)69%high
October Weather6°C (43°F)51 mm (2.0 inches)71%moderate
November Weather-1°C (31°F)17 mm (0.7 inches)82%moderate
December Weather-5°C (23°F)20 mm (0.8 inches)84%low

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