100-Degree Heat Index, Hot Weekend Ahead For IL

ILLINOIS — After several days in the 80s, temperatures will be warmer this weekend. According to the National Weather Service, heat index values will be near or above 100 degrees on Sunday.

Temperatures will start to warm on Saturday, where highs will be near 90 degrees. Sunday will highs in the 90s, and then a chance of thunderstorms late Sunday into Monday.

After the hot temperatures Sunday, temperatures will be back to the 80s during the week.

Here is a more detailed look at the weather for this weekend, with a forecast from the National Weather Service:

FRIDAY NIGHT: Mostly clear, with a low around 65. East northeast wind around 5 mph becoming calm in the evening.

SATURDAY: Mostly sunny, with a high near 88. Light south wind increasing to 5 to 10 mph in the morning.

SATURDAY NIGHT: Partly cloudy, with a low around 71. South southwest wind around 5 mph.

SUNDAY: A 20 percent chance of showers and thunderstorms after 2 p.m. Mostly sunny, with a high near 91. Southwest wind 5 to 15 mph.

SUNDAY NIGHT: Showers and thunderstorms likely, mainly after 2 a.m. Mostly cloudy, with a low around 74. Chance of precipitation is 60 percent.