May Weather in Butte, United States

Last updated: June 24, 2025

In May, the average temperature in Butte, United States hovers around 5°C (42°F). Expect a minimum chill of -6°C (21°F) and occasional highs reaching 19°C (66°F). With 75 mm (2.9 in) of precipitation spread over 14 days, it's wise to have an umbrella handy. The average humidity is a comfortable 88%, ensuring a crisp yet refreshing atmosphere.

May Temperature in Butte

In May in Butte the average temperature is 5°C (42°F). Maximum can reach 19°C (66°F) and minimum can be as low as -6°C (21°F). It's advisable to pack layers to stay comfortable while exploring the local attractions.

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

The chart illustrates May temperature patterns in Butte, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Butte, May typically has an average temperature of 5°C (42°F), with highs reaching up to 19°C (66°F) and lows dropping to around -6°C (21°F).

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

May Precipitation in Butte

In Butte in May, the total precipitation amount is 75 mm (2.9 in) accumulated over a period of 14 days.

May Precipitation Trends in Butte

The chart displays monthly precipitation patterns in Butte, 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 Butte, May typically receives around 75 mm (2.9 inches) of precipitation spread over approximately 14 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 Butte

In Butte in May humidity is 88%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less appealing and leading you to seek warmth indoors instead.

May Average Humidity in Butte

This chart illustrates the average monthly humidity levels in Butte, 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 Butte is approximately 88%, 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 Butte

In Butte in May, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Butte, you can refer to this Hourly UV Index in Butte.

Maximum UV Index Levels in Butte for May

The chart shows the monthly maximum UV Index (UVI) for Butte 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 Butte typically reaches 6, which falls under the high exposure category.

Data source: Butte 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 Butte Compares to Other Months

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

This table compares monthly weather conditions in Butte, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-12°C (11°F)	80 mm (3.1 inches)	94%	low
February Weather	-10°C (15°F)	74 mm (2.9 inches)	93%	low
March Weather	-7°C (20°F)	72 mm (2.8 inches)	91%	moderate
April Weather	0°C (33°F)	54 mm (2.1 inches)	85%	moderate
May Weather	5°C (42°F)	75 mm (2.9 inches)	88%	high
June Weather	11°C (51°F)	83 mm (3.3 inches)	95%	high
July Weather	13°C (56°F)	89 mm (3.5 inches)	102%	high
August Weather	12°C (53°F)	137 mm (5.4 inches)	100%	moderate
September Weather	7°C (45°F)	127 mm (5.0 inches)	96%	moderate
October Weather	1°C (33°F)	173 mm (6.8 inches)	91%	low
November Weather	-9°C (17°F)	114 mm (4.5 inches)	95%	low
December Weather	-8°C (17°F)	142 mm (5.6 inches)	96%	low