Craving some fall-like weather featuring mild days and cooler nights? You won't have to wait much longer as the Quad Cities region typically sees its biggest dip in average high temperatures in the coming weeks.
As we draw closer to the fall equinox, the time of year when the Sun appears to close the equator heading southward, we'll continue to lose the amount of incoming solar radiation as the stronger rays will be focused further south of the Quad Cities.
It's remarkable to see the difference in energy levels when you look at August compared to October.
Incoming solar radiation energy is measured in British thermal units or BTUs. This is the same measurement you would find on a heating unit for your home.
We max out on that incoming solar radiation during the months of July and August, but fast forward to October and that energy is literally sliced in half. That means it takes more than just the energy from the sun to substantially warm up our temperatures. You'll often need a strong south breeze too!
With the loss of this energy, we'll see a fairly steep decline in our average high temperatures for the next two months and beyond.
Average highs in early September hover in the lower 80s. By the end of the month, we'll usually see high temperatures in the lower 70s. It gets dramatically cooler by the end of October when average high temperatures will be limited even further to the upper 50s.
By no means does this mean we are done with the heat. It isn't all that uncommon to see 80s and even a few 90s in September into early October. It is a sign, however, that the number of days we have the substantial summer-like warmth are numbered and due to come to an end soon!
- Meteorologist Andrew Stutzke
Here's a look at the hour-by-hour forecast from the StormTrack 8 Weather App:
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