From Meteorologist Eric Gardner:
The heat continues to build along with a few storms
We are warmer for today with highs in the 90s for many. While we are mostly sunny much of the day, storms do develop during the afternoon and evening hours. Some could be strong to severe. We're hot on Friday and a few storms are possible late in the afternoon and evening, something we will watch closely for the fireworks at Mount Rushmore.
This weekend will stay hot on Saturday with highs still in the 90s. A few storms are possible in the afternoon. Sunday will not be as warm, but that is because we have a better chance at scattered storms around midday and through the afternoon. Temperatures will hit the mid 80s midday before cooling off a bit in the afternoon. Monday will be in the mid 80s for the same reason, midday and afternoon showers and storms.
There are signs of hotter and drier weather - highs well on up into the 90s, late next week.