Hail is the standout weather threat at Jewel Cave National Monument, with 33 recorded hail events in Custer County making it far and away the most frequent hazard visitors face here. Thunderstorm wind events add another 10 incidents to the mix, meaning fast-moving storms can turn a quiet afternoon in the Black Hills into a dangerous situation with little warning. The county's violent crime rate of 376.6 per 100,000 is also meaningfully above national averages and worth keeping in mind, particularly at trailheads and parking areas.
When a storm builds — and in this region they build fast — get underground if you're already on a cave tour, as the limestone interior offers genuine protection from hail and wind. Keep a hardshell roof cargo cover or moving blankets in your vehicle to shield windows from hail damage, and store valuables out of sight in a locked compartment rather than leaving them visible at the trailhead. Check the National Weather Service Rapid City forecast each morning before heading out.
Top recorded hazards in Custer County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Hail 33
- Thunderstorm Wind 10
Gear keyed to this park's risks
Recommendations driven by the actual hazards above. As an Amazon Associate we earn from qualifying purchases.
Own this campground? Get featured.
Premium listing slots for verified owners — show photos, amenity details, and direct booking links above the standard data card. Drop your contact info and we'll reach out.
About Jewel Cave National Monument
Immerse yourself in one of the longest caves in the world. With over 220 miles of mapped and surveyed passages, this underground wilderness appeals to human curiosity. Its splendor is revealed through fragile formations and glimpses of brilliant color. Its maze of passages lures explorers, and its scientific wealth remains a mystery. This resource is truly a jewel in the National Park Service.
Weather
Weather in the Black Hills varies significantly throughout the year and may be drastically different from the northern hills to the southern hills. The temperatures listed are for average lows to average highs in the location of Custer, South Dakota. Spring ~ Temp. Range of 29°F to 53°F / Summer ~ Temp. Range of 54°F to 80°F / Fall ~ Temp. Range of 33°F to 58°F / Winter ~ Temp. Range of 14°F to 37°F The yearly average rain is 19 in., with May being the wettest month. The yearly average snow is 48 in.