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  • Tim McGill

Abundant August Sunshine But Rainfall Deficit Deepens

This summer has sizzled so far. As of yesterday it ranks as the third warmest on record for Chicago. June was 5° above average. July was 5.2° above average. August is running 2° above average. We will remain warmer than average at least through the middle of next week. Today's highs should reach into the middle 80s but a breeze off the lake will keep it cooler lakeside with highs there in the lower 80s.

It's been a warm summer and it's been a relatively dry summer. That pattern will continue too through most of next week. Rainfall is running 2.57 inches below average since June 1st. Since July 1st rainfall has been 3.52 inches below average. The GFS model has now pushed back our next chance of rain until late Sunday while the European model keeps it dry through the weekend. Beyond that the next decent chance of rain isn't until the end of next week.

The longer range precipitation probability forecasts have us outlooked for above average rainfall overall from August 25th through September 2nd. As I mentioned in my blog earlier in the week, the US Drought Monitor has an expanding area of "abnormally dry" conditions in northern Illinois that could slip into a moderate drought if our dry pattern continues.

The long range temperature 6-10 day probability forecast keeps us above average overall from August 25th through the 29th. The 8-14 day forecast has us near normal from August 27th through September 2nd.

Here is my 7 day forecast:

Today: Sunny skies High: 85 (81 Lakefront)

Friday: Sunny skies Low: 67 High: 87 (83 Lakefront)

Saturday: Sunny skies Low: 68 High: 90

Sunday: Mostly sunny Low: 68 High: 91

Monday: Mostly sunny Low: 69 High: 90

Tuesday: Mostly sunny Low: 70 High: 91

Wednesday: Mostly sunny Low: 71 High: 91



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