 The 930 WFMD Skyscan. Forecaster Frederick in the surrounding counties. Sunny and hot today. High 93. Heat index values as high as 100. Do have a 20% chance. Could see a shower or a thunderstorm this afternoon. Partly cloudy tonight. Low 73 tomorrow. Sunny, sunny, hot. High 97. Heat index values as high as 102. Clear on Sunday night. Low 74. Sunny, hot Monday. High 100. Could see some showers and thunderstorms.