AccuWeather: Seasonable today, but extreme heat returns this week for the Philadelphia region

PHILADELPHIA (WPVI) -- Enjoy today's seasonable conditions before heat and humidity peak midweek.

MONDAY: Another nice day with plenty of sun, high 87. It'll be dry and comfortable for the Home Run Derby.

TUESDAY: The heat starts to build. It's sunny and warm, high 94. Temperatures will be in the upper 80s for the All-Star Game.

WEDNESDAY: Sunny and hot! It's the peak of the heat, high 100. Heat index values will range between 105 and at least 108, which has triggered and Extreme Heat Watch.

THURSDAY: Another hot day as heat wave #5 rolls on, high 96.

FRIDAY: The high heat starts to buckle. Clouds mix with sunshine, high 94.

SATURDAY: Some sun. Watching for the chance of a late day thunderstorm, high 90.

SUNDAY: We could see some showers and thunderstorms keeping us with cooler temperatures, high 84.