May Weather in Roundup, United States

Last updated: June 24, 2025

In Roundup, United States, the average temperature for May hovers around 12°C (55°F). However, temperatures can range from a chilly -4°C (25°F) at night to a warm 30°C (87°F) during the day. Expect 65 mm (2.6 in) of precipitation over approximately 11 days, coupled with an average humidity level of 75%.

May Temperature in Roundup

In May in Roundup, the average temperature is 12°C (55°F). The maximum can reach 30°C (87°F) and the minimum can be as low as -4°C (25°F). Be prepared for a wide range of temperatures when traveling to Roundup this month.

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

The chart illustrates May temperature patterns in Roundup, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roundup, May typically has an average temperature of 12°C (55°F), with highs reaching up to 30°C (87°F) and lows dropping to around -4°C (25°F).

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

May Precipitation in Roundup

In Roundup in May, the precipitation amount is 65 mm (2.6 in) over a span of 11 days.

May Precipitation Trends in Roundup

The chart displays monthly precipitation patterns in Roundup, 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 Roundup, May typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Roundup

In Roundup in May humidity is 75%. With an average temperature of 12°C (55°F), this humidity feels like a damp blanket wrapping around you, making travel slightly uncomfortable as the chill magnifies the moisture in the air.

May Average Humidity in Roundup

This chart illustrates the average monthly humidity levels in Roundup, 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 Roundup is approximately 75%, 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 Roundup

In Roundup in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Roundup.

Maximum UV Index Levels in Roundup for May

The chart shows the monthly maximum UV Index (UVI) for Roundup 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 Roundup typically reaches 9, which falls under the very high exposure category.

Data source: Roundup 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 Roundup Compares to Other Months

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

This table compares monthly weather conditions in Roundup, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	19 mm (0.7 inches)	81%	low
February Weather	-7°C (20°F)	36 mm (1.4 inches)	85%	moderate
March Weather	2°C (35°F)	27 mm (1.1 inches)	77%	moderate
April Weather	6°C (43°F)	61 mm (2.4 inches)	72%	very high
May Weather	12°C (55°F)	65 mm (2.6 inches)	75%	very high
June Weather	19°C (66°F)	69 mm (2.7 inches)	78%	very high
July Weather	23°C (75°F)	22 mm (0.9 inches)	79%	very high
August Weather	22°C (72°F)	20 mm (0.8 inches)	76%	very high
September Weather	16°C (62°F)	38 mm (1.5 inches)	67%	very high
October Weather	7°C (46°F)	34 mm (1.3 inches)	69%	moderate
November Weather	2°C (37°F)	23 mm (0.9 inches)	78%	moderate
December Weather	-2°C (29°F)	26 mm (1.0 inches)	85%	low