September has certainty started on a hot note across the Stateline. Through the first eight days, Rockford's average temperatures sits at 78.5 degrees, placing it fifth-warmest start to September on record. A stretch that includes afternoon highs in the low 90s during the first 4 days of the month, combined with well-above average overnight lows.
Despite a cold front moving through the Stateline this morning, temperatures are still expected to climb into the low 80s this afternoon, with some locations reaching just above the 80-degree mark. Expect skies to remain mostly cloudy for much of the day, though some breaks are possible later on. A lingering shower cannot be ruled out during the afternoon, but the trend will be towards improving conditions as the best rain chance pushes south with the front.
Dry weather settles back in on Thursday as an area of high pressure builds in behind today's front. The influx of cooler, less humid air will make for a great September day, featuring lots of sun, comfortable humidity, and highs in the upper 70s.
Unfortunately, the cooling trend doesn't continue beyond Thursday. Winds will shift to the south Friday and then to the southwest for Saturday and Sunday, allowing warmer air will once again surge into the Stateline. This return flow will allow afternoon highs to climb back into the low 80s, extending September's stretch of above-average warmth.
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