Temperatures will be in the upper 70s to low 80s all weekend.
Under dark skies, it's possible to see between 50 and 100 meteors an hour, with a good possibility for fireballs.
The weather service said there will be several windows for rain and storms on Monday.
The weather service said that "an unsettled pattern" will return once again early next week.
Hot and humid conditions are expected Wednesday and Thursday, with several chances of storms through the end of the week.
The aurora borealis may be seen deep into the nation’s midsection if weather conditions allow.
Severe storms are possible Monday afternoon. If storms do form, there could be damaging winds, quarter-sized hail, and possible tornadoes.
After a sweltering summer, The Old Farmer’s Almanac predicts autumn will arrive on time in Illinois this year.
Ready your umbrellas. It's likely storms will start Tuesday afternoon and continue into Wednesday.
Thursday will have a high of 78, Friday a high of 81, Saturday a high of 83, and Sunday a high of 83.
A derecho caused widespread damage in the Chicago area, and thousands are still without power.
Here’s what the next few months look like in Illinois.
The weather service said there are 29 different paths of potential damage that its teams are investigating.
The time frame for these storms is from 6 p.m. to 2 a.m. on Monday evening into Tuesday. Large hail and tornadoes are possible.
Some residents reported being jolted awake by the quake or thinking a car had hit their house.
There is a level 1 of 5 severe storm risk on both Saturday and Sunday, and a level 2 of 5 risk on Monday.
"Heat indices may approach or exceed 100 degrees Sunday through Tuesday," the weather service said.
Heavy rain is most likely for areas south of Chicago.
Saturday has a high of 81; Sunday will be warmer with a high of 87 degrees.
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The weather service said that chances for showers and storms increase starting Tuesday and could continue through Friday.
Storms will become more widespread on Friday evening and overnight.
In the United States, extreme heat kills more people than hurricanes, tornadoes, earthquakes, floods and other natural disasters
Several waves of storms are possible starting Monday night through Tuesday night.
A few storms could be strong to severe on Saturday afternoon and evening.
The full moon is called the strawberry moon as it occurs during the relatively short season for harvesting the sweet, succulent berries.
Periodic storm chances are possible throughout the week as well.
Heat index values of 105 are expected early next week.
Severe weather on Thursday includes a risk of damaging winds, damaging hail, flash flooding and tornadoes.
Thursday will be another warm day, with a high of 91 degrees, and a potential for severe storms in the Chicago area.
After gusty winds on Friday, the rest of the weekend looks to be mostly dry and pleasant, with highs in the 70s.
Tuesday's warm weather may give way to gusty winds, hail and thunderstorms in the afternoon and evening.
After 3 p.m. on Monday, additional storms are possible, some of which may be strong to severe.
Jupiter, Mercury, Uranus, Mars, Neptune and Saturn will be aligned in the Eastern sky, according to experts.
Rain and a "few embedded thunderstorms" are expected to develop early Saturday, but no severe weather is expected.
Scattered showers and storms are possible Tuesday afternoon into the evening, the weather service said.
A first round of storms could bring lightning and downpours, but a second round could be more severe.
A severe thunderstorm watch has been issued for all of northern Illinois, until 1 p.m. Friday.
There is a level 2 out of 5 risk of severe storms for Friday, the weather service said.
The tornado watch was in effect until midnight for 9 Chicago-area counties, and a wind advisory was in place until 2 a.m.