Monday starts mostly sunny and quiet, with temperatures in the upper 60s around daybreak and only a light breeze out of the east-southeast. It will not take long to heat up. By late morning, sunshine stays in charge and the air turns more uncomfortable as the temperature climbs quickly.
Through the afternoon, the forecast is simple: hot, bright and dry. Monday’s high reaches 99, with a light south-southwest wind around 8 mph and gusts up to 16 mph. Rain chances stay near zero. It will feel a little hotter than the thermometer, with feels like values peaking near 102. If you have plans outside, this is the part of the day to take seriously.
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By evening, the sun is still strong at first, then conditions ease only slightly after sunset. Skies stay mostly clear, and the breeze backs off as temperatures slowly fall through the 80s. Humidity will keep things sticky, so it may still feel warmer than the air for a while even after dark.
Overnight, the weather stays mainly clear, warm and humid, with a low around 70 and light south winds near 6 mph. There is still almost no chance for rain before Tuesday morning.
A Heat Advisory is in effect from noon Monday through 8 p.m. Friday for parts of the St. Louis metro area, including Madison, St. Clair and Monroe counties in Illinois. Heat index values could reach 105.
The allergy index is high Monday, with ragweed at very high levels and grass also running high.
Tuesday looks just as intense, with a high near 99, a low around 73 and more hot, sunny weather with very little chance of rain.
Get the latest updates on weather conditions here: RiverBender.com/weather.
