With the chance of storms in the afternoon passing without real precipitation, the attention now turns to the "polar" air that will make for good sleeping weather without air-conditioning in the middle of July.
The National Weather Service expects the low temperatures to hit around 53 in the Chicago area tonight.
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The service's forecast shows an even lower low in some suburbs early Wednesday morning, down to 49 in Kane County.
The record low Chicago area temperature for a July 15 is 52, set in 1967. For July 16, it's 49 in 1945.
While it'll be a cool week for July, the high temperatures still are expected to be 70 or higher.
Tuesday's forecast calls for a high of 70, as a matter of fact, with a 30 percent chance of rain mainly after 2 p.m.
By the end of the week, the high is expected to climb to the higher 70s, with lows above 60.