 Your WDEL Weather Center forecast. Patchy fog overnight tonight. Mostly clear, low around 75 degrees. Tomorrow, a slight chance of showers and thunderstorms in the afternoon. Patchy fog in the morning. A sunny day with a high near 96. Heat index is as high as 102. A slight chance of overnight showers and thunderstorms tomorrow night. Mostly clear, low around 76. Sunny and hot Tuesday, high near 99.