Cooler temperatures will not be far behind the first day of autumn Sept. 23.
Today the high should reach about 87 degrees in the Tri-Cities.
But a storm system may bring rain showers and should drop high temperatures into the 70s starting Thursday in the Tri-Cities.
Highs should be in the low 70s Thursday and Friday, raising to the mid 70s Saturday and Sunday.
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Lows should be in the low 50s at the end of the week through Sunday.
The normal high for the Tri-Cities at the end of August is about 74 degrees and the normal low is 47 degrees.