Days are warm and sunny - sunscreen is strongly recommended. The high temperature for 1998 was 92 degrees. The high temperature for 1999 was 92 degrees. The high temperature for 2000 was 100 degrees. The advantage to the hot temperatures is a lack of humidity.
Nights are cool - warm jackets, sweaters and gloves feel comfortable.
The low temperature for 1998 was 61 degrees. The low temperature for 1999 was 45 degrees. The low temperature for 2000 was 51 degrees. Because Sturgis is in the middle of the U.S., summer storms with strong winds, hard rain, hail, lightning and thunder are not uncommon. Rain gear is a must.