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  • Tim McGill

Weekend Heat Surge But Is Cooler Air Coming In August?

Updated: Jul 24, 2020

Seasonably warm but still a bit above average today and tomorrow before a steamy Saturday and Sunday. Our rather warm summer marches on. 34 of the past 37 days have been above average. July is running 5.6° above average. There are some signals that we could transition to a cooler pattern by the middle of August. More on that below.


Today's highs will be just a smidge cooler with a wind off the lake. Look for lower 80s most areas but upper 70s at the lakefront.

It's a steam bath again this weekend as highs climb back into the lower 90s. Dew points will be climbing too into the lower to middle 70s. That combination of heat and humidity will make it feel like over 100° by Sunday afternoon.

There could be a spotty shower or thunderstorm late Sunday but most of the next four days should be dry. A better chance for some at least scattered thunderstorms on Monday.

The long range forecasts for temperature are bucking the trend we've seen so often this summer. Usually both the 6-10 and 8-14 day temperature probability forecasts are in sync with both showing above average temperatures for Chicago and the midwest being favored. The latest 6-10 day outlook actually has us near normal overall for the end of July. The 8-14 has us with favored slightly for above average temperatures for the start of August. This change taken with an even longer range temperature forecast seems to signal a possible shift to cooler weather next month.

The long range forecast for the week ending on August 14th has us favored for cooler than average temperatures overall by the middle of next month. Stay tuned.

Here is my 7 day forecast:

Today: Sun & cloud mix High: 82 (78 Lakefront) Friday: Partly to mostly sunny Low: 65 High: 5 (82 Lakefront) Saturday: Mostly sunny, hot & humid Low: 68 High: 89 Sunday: Partly to mostly sunny, hot & humid Low: 75 High: 92 (Heat index near 100°) Monday: Partly sunny, sct. showers & t-storms Low: 68 High: 86 Tuesday: Partly to mostly sunny Low: 68 High: 84 (80 Lakefront)

#ilwx

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