Chicago's August 20 High Temperatures Expected Below Seasonal Normals
Chicago's August 20 High Temperatures Expected Below Seasonal Normals
US · Published Aug 21, 2026
According to the National Weather Service and ensemble models, Chicago's maximum temperature on August 20, 2026, is forecasted to range between 78°F and 81°F (25.6°C to 27.2°C).
This is notably below the seasonal average of 82°F (27.8°C).

Impact & Risks

The cooler-than-average temperatures are unlikely to pose significant risks to residents or infrastructure. However, scattered showers may lead to minor disruptions for outdoor activities. The suppressed heating could provide relief from typical late-summer heat, benefiting those sensitive to higher temperatures.

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