Your morning South Dakota weather update A Red Flag Warning is in effect across much of South Dakota today, with critically dry conditions and gusty winds creating dangerous fire weather. Any spark could rapidly spread in these conditions, so avoid outdoor burning and be extremely careful with anything that could start a fire. We're starting off with temperatures around 45 degrees this morning, but don't let that cool start fool you - we're heading for a warm afternoon with highs reaching 75 degrees by 4 P.M.