Last updated: June 24, 2025
In April, the average temperature in Rapid City, United States hovers around 5°C (42°F). Expect a wide temperature range, with a minimum dipping to -16°C (3°F) and a maximum soaring to 26°C (80°F). Precipitation levels reach 97 mm (3.8 in) over approximately 14 days, contributing to an average humidity of 87%. Stay prepared for varied weather conditions during your visit!
In April in Rapid City, the average temperature is 5°C (42°F). The maximum can reach 26°C (80°F), and the minimum can be as low as -16°C (3°F). It's a time of year to prepare for both chilly and mild weather, making it essential to pack layers for your travels.
In Rapid City in April, the total precipitation amount is 97 mm (3.8 in) spread over 14 days.
In Rapid City in April humidity is 87%. 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 enjoyable and travel less inviting as the air becomes heavy and oppressive.
In Rapid City in April, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 April’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 |