After a brief stretch of cooler and cloudy weather, we will see a return to summer-like warmth to take us through the last week of September. The upper level pattern will flip on its head over the weekend, bringing another ridge of high pressure over the Central Plains and Midwest.
This will boost our temperatures back to the 80s over the weekend and much of next week. Average high temperature this time of year is near 70 degrees but forecast highs will be about 10+ degrees above that into the weekend.
Only 4 years in Rockford's history have seen the last week average an 80-degree high: 1897, 1905, 1953, and 2021. This year could become the 5th to average an 80-degree high, as our current forecast would result in an average of exactly 80 degrees over the last week of September.
5 days this week are forecast to reach at least 80-degrees. Only 2 other years have seen 5 days reach 80 in the last week of September: 2014 and 2021. Again, 2025 could add to this list as Friday (26th) through Tuesday (30th) are forecast to reach 80 or higher.
This warm pattern also comes with a lack of rainfall. Many computer models are forecasting zero rainfall across Northern Illinois through at least next Wednesday, if not longer. The upper-level ridge may finally start breaking down toward the end of next week, signaling an eventual pattern change after the first few days of October.
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