May Weather in Williston, United States

Last updated: June 24, 2025

In May, the average temperature in Williston, United States hovers around 12°C (55°F). Expect temperatures to range from a chilly -7°C (20°F) to a warm 32°C (91°F). With about 45 mm (1.8 in) of precipitation over 8 days, it's a month where you might want to keep an umbrella handy. The average humidity stands at a comfortable 73%, adding to the overall atmosphere of the season.

May Temperature in Williston

In May in Williston, the average temperature is 12°C (55°F), with maximum temperatures reaching up to 32°C (91°F) and minimums dropping as low as -7°C (20°F). Travelers should be prepared for a wide range of weather conditions during this time.

May Weather in Williston: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Williston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williston, May typically has an average temperature of 12°C (55°F), with highs reaching up to 32°C (91°F) and lows dropping to around -7°C (20°F).

Data source: Temperature data for Williston generated using information from the Copernicus Climate Change Service.

May Precipitation in Williston

In Williston in May, the precipitation amount is 45 mm (1.8 in) over the course of 8 days.

May Precipitation Trends in Williston

The chart displays monthly precipitation patterns in Williston, 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 Williston, May typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Williston

In Williston in May, humidity is 73%. With an average temperature of 12°C (55°F), this humidity feels like a cool, damp embrace that can make traveling a bit more challenging, as the air hangs heavy and might leave you feeling chilled, especially during outdoor adventures.

May Average Humidity in Williston

This chart illustrates the average monthly humidity levels in Williston, 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 Williston is approximately 73%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Williston

In Williston 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 Williston.

Maximum UV Index Levels in Williston for May

The chart shows the monthly maximum UV Index (UVI) for Williston 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 Williston typically reaches 8, which falls under the very high exposure category.

Data source: Williston 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 Williston Compares to Other Months

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

This table compares monthly weather conditions in Williston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (14°F)	11 mm (0.4 inches)	89%	low
February Weather	-12°C (11°F)	18 mm (0.7 inches)	92%	moderate
March Weather	-2°C (28°F)	23 mm (0.9 inches)	84%	moderate
April Weather	3°C (38°F)	28 mm (1.1 inches)	74%	very high
May Weather	12°C (55°F)	45 mm (1.8 inches)	73%	very high
June Weather	19°C (66°F)	74 mm (2.9 inches)	69%	very high
July Weather	22°C (71°F)	58 mm (2.3 inches)	76%	very high
August Weather	20°C (68°F)	44 mm (1.7 inches)	74%	very high
September Weather	15°C (58°F)	59 mm (2.3 inches)	65%	high
October Weather	5°C (42°F)	30 mm (1.2 inches)	71%	moderate
November Weather	-2°C (29°F)	19 mm (0.7 inches)	84%	low
December Weather	-7°C (20°F)	19 mm (0.8 inches)	92%	low