May Weather in Casper, United States

Last updated: June 24, 2025

In May, the average temperature in Casper, United States hovers around 10°C (50°F), providing a mild climate. However, be prepared for a wide range, with minimums dipping to -13°C (9°F) and highs reaching up to 28°C (83°F). Expect 70 mm (2.7 in) of precipitation spread over 12 days, while the air feels comfortably humid at an average humidity of 70%.

May Temperature in Casper

In May in Casper, the average temperature is 10°C (50°F). The maximum can reach 28°C (83°F), while the minimum can drop as low as -13°C (9°F). Be prepared for a wide range of weather conditions if you're planning to travel during this time.

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

The chart illustrates May temperature patterns in Casper, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casper, May typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (83°F) and lows dropping to around -13°C (9°F).

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

May Precipitation in Casper

In Casper in May, the precipitation amount is 70 mm (2.7 in) over the course of 12 days.

May Precipitation Trends in Casper

The chart displays monthly precipitation patterns in Casper, 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 Casper, May typically receives around 70 mm (2.7 inches) of precipitation spread over approximately 12 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 Casper

In Casper in May, humidity is 70%. With an average temperature of 10°C (50°F), this humidity feels like a cool embrace on your skin, making it a refreshing yet damp experience for traveling.

May Average Humidity in Casper

This chart illustrates the average monthly humidity levels in Casper, 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 Casper is approximately 70%, 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 Casper

In Casper in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Casper.

Maximum UV Index Levels in Casper for May

The chart shows the monthly maximum UV Index (UVI) for Casper 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 Casper typically reaches 10, which falls under the very high exposure category.

Data source: Casper 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 Casper Compares to Other Months

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

This table compares monthly weather conditions in Casper, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	23 mm (0.9 inches)	79%	moderate
February Weather	-7°C (19°F)	31 mm (1.2 inches)	81%	high
March Weather	-1°C (31°F)	48 mm (1.9 inches)	70%	high
April Weather	3°C (38°F)	59 mm (2.3 inches)	67%	extreme
May Weather	10°C (50°F)	70 mm (2.7 inches)	70%	very high
June Weather	18°C (65°F)	30 mm (1.2 inches)	75%	extreme
July Weather	22°C (72°F)	17 mm (0.7 inches)	76%	extreme
August Weather	21°C (69°F)	19 mm (0.7 inches)	76%	extreme
September Weather	16°C (60°F)	29 mm (1.2 inches)	72%	very high
October Weather	5°C (41°F)	43 mm (1.7 inches)	70%	high
November Weather	1°C (34°F)	26 mm (1.0 inches)	76%	moderate
December Weather	-5°C (24°F)	27 mm (1.1 inches)	81%	moderate