Cloud cover, scattered showers, and breezy conditions associated with an incoming line of severe thunderstorms are currently capping temperature rise across the Chicago area on June 17, keeping the daily maximum in the upper 60s according to National Weather Service observations and short-range model guidance. These factors reduce solar heating compared to clearer, calmer setups that historically allow readings several degrees higher under similar June climatology. With probabilities closely split among the 66–71 °F bins, traders are weighing the precise timing of storm arrival and any breaks in cloud cover that could permit brief warming before peak heating ends. Updated NWS forecasts and real-time surface observations through the afternoon will determine whether the high settles nearer 66–67 °F or edges into the 68–69 °F range.