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May Weather in Glen Ullin, United States

Last updated: June 24, 2025

In May, the average temperature in Glen Ullin, United States is a comfortable 13°C (55°F). However, be prepared for a range that can dip to a chilly -3°C (26°F) or rise to a warm 31°C (89°F). This month also brings an average of 61 mm (2.4 in) of precipitation over 9 days, coupled with a humidity level of 76%. Stay hydrated and enjoy the variety of weather!

May Temperature in Glen Ullin

In May in Glen Ullin, the average temperature is 13°C (55°F), with maximums reaching 31°C (89°F) and minimums dropping as low as -3°C (26°F). This variation makes it essential for travelers to pack accordingly, ensuring they are prepared for both warm and chilly conditions.

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

The chart illustrates May 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, May typically has an average temperature of 13°C (55°F), with highs reaching up to 31°C (89°F) and lows dropping to around -3°C (26°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.

May Precipitation in Glen Ullin

In Glen Ullin in May, the precipitation amount is 61 mm (2.4 in) spread over 9 days.

May Precipitation Trends in Glen Ullin

The chart displays monthly precipitation patterns in Glen Ullin, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Glen Ullin, May typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec121625286154617252511720
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Glen Ullin

In Glen Ullin in May humidity is 76%. With an average temperature of 13°C (55°F), this humidity feels like a damp, heavy blanket enveloping you, making it feel cooler than it actually is, which can be quite refreshing for short excursions but may also lead to discomfort during prolonged outdoor activities.

May Average Humidity in Glen Ullin

This chart illustrates the average monthly humidity levels in Glen Ullin, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Glen Ullin is approximately 76%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Glen Ullin

In Glen Ullin in May, 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 Glen Ullin.

Maximum UV Index Levels in Glen Ullin for May

The chart shows the monthly maximum UV Index (UVI) for Glen Ullin in May, 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 May, the maximum UV index in Glen Ullin typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2459810997532
Data source: Glen Ullin May 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 May 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 May’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 May’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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