Last updated: June 24, 2025
In May, the average temperature in Rapid City, United States hovers around 13°C (56°F), offering a mild climate for visitors. However, be prepared for temperature fluctuations, as it can dip as low as -3°C (27°F) or soar up to 33°C (92°F). With an average precipitation of 119 mm (4.7 in) spread across 12 days, and an average humidity level of 82%, it's wise to pack accordingly for a comfortable experience!
In May in Rapid City, the average temperature is 13°C (56°F). Maximum temperatures can reach 33°C (92°F), while minimums can dip to as low as -3°C (27°F). Be prepared for a wide range of temperatures when traveling during this month.
In Rapid City in May, the total precipitation amount is 119 mm (4.7 in), falling over a span of 12 days.
In Rapid City in May, humidity is 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.
In Rapid City 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 Rapid City.
UV Risk Categories
Weather in Rapid City varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Rapid City, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -6°C (22°F) | 57 mm (2.2 inches) | 91% | low |
February Weather | -6°C (22°F) | 62 mm (2.4 inches) | 91% | moderate |
March Weather | -1°C (31°F) | 62 mm (2.4 inches) | 87% | moderate |
April Weather | 5°C (42°F) | 97 mm (3.8 inches) | 87% | high |
May Weather | 13°C (56°F) | 119 mm (4.7 inches) | 82% | very high |
June Weather | 19°C (66°F) | 111 mm (4.4 inches) | 79% | very high |
July Weather | 21°C (71°F) | 103 mm (4.1 inches) | 75% | very high |
August Weather | 20°C (68°F) | 91 mm (3.6 inches) | 76% | very high |
September Weather | 16°C (61°F) | 78 mm (3.1 inches) | 79% | high |
October Weather | 10°C (49°F) | 131 mm (5.2 inches) | 83% | moderate |
November Weather | 2°C (35°F) | 77 mm (3.0 inches) | 86% | moderate |
December Weather | -2°C (28°F) | 74 mm (2.9 inches) | 87% | low |