Weather in Badlands National Park, South Dakota, can vary widely depending on the season and time of year. Here's what you can expect:

Summer (June to August): Summer brings warm temperatures to the Badlands, with highs typically ranging from 80°F to 100°F (27°C to 38°C). However, temperatures can occasionally exceed 100°F (38°C) during heatwaves. Summer is also the park's busiest season, with long daylight hours and minimal precipitation.

Fall (September to November): Fall is a popular time to visit the Badlands, as temperatures begin to cool and the park's landscapes are painted with vibrant hues of red, orange, and gold. Daytime temperatures range from 50°F to 70°F (10°C to 21°C), with cooler evenings.

Winter (December to February): Winter in the Badlands can be harsh, with temperatures often dropping below freezing. Daytime highs range from 20°F to 40°F (-7°C to 4°C), while nighttime lows can plummet below 0°F (-18°C). Snowfall is common, especially in January and February.

Spring (March to May): Spring brings milder temperatures and the promise of new growth to the Badlands. Daytime highs range from 40°F to 60°F (4°C to 15°C), with occasional fluctuations. Spring also marks the start of the park's wildflower season, with blooms beginning to appear in April and May. It's important to be prepared for changing weather conditions when visiting Badlands National Park, as temperatures can vary significantly throughout the day and night. Be sure to dress in layers, wear sunscreen and a hat to protect against the sun, and carry plenty of water, especially during the hot summer months. Additionally, check the weather forecast before your visit and be aware of any potential hazards, such as thunderstorms or extreme temperatures.