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Decatur, IL Weather Tomorrow

Whether you're planning work or travel, tomorrow's Decatur weather and 5 day forecast offer precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction for the Decatur area and around Macon county, Illinois.
Updated: Tue Oct 13th 2026 7:30 AM CDT
Decatur, IL Weather – 10-13 – Sunny
90° / 68°
Sunny
Decatur is set for sunshine with temperatures peaking at 90°F and dipping to 68°F. Rainfall predicted to have a 57% chance with an estimated 0.18in. Wind will be moderate, blowing around 14mph on average and gusts of 23.3mph at 8 AM. Humidity levels should be comfortable, sitting around 55% on average, the maximum being 78% at 11 PM and 42% being its lowest at 1 PM. Barometric pressure is its highest of 29.9inHg at 10 AM, a lowest point of 29.83inHg at 3 PM with an avg 29.86inHg.
Decatur, IL Weather – 10-14 – Scattered Showers
76° / 66°

Weather Tomorrow

Scattered Showers
In Decatur, passing showers are likely with a high near 76°F and a low around 66°F. The chance of rain is 89% with an estimated 0.45in. Wind will be moderate, blowing around 12mph on average and gusts of 22.6mph at 4 AM. High humidity with average of 84% is anticipated, the maximum being 95% at 5 AM and 73% being its lowest at 4 PM. Barometric pressure is its highest of 30.06inHg at 10 PM, a lowest point of 29.87inHg at 12 AM with an avg 29.98inHg.
Decatur, IL Weather – 10-15 – Partly Cloudy
80° / 62°
Partly Cloudy
Skies will be cloudy in Decatur, with a high of 80°F and a low of 62°F. The chance of rain is 82% with an estimated 0.38in. Wind will be moderate, blowing around 17mph on average and gusts of 35.4mph at 9 PM. High humidity with average of 82% is anticipated, the maximum being 92% at 11 PM and 69% being its lowest at 5 PM. Barometric pressure is its highest of 30.06inHg at 12 AM, a lowest point of 29.83inHg at 5 PM with an avg 29.95inHg.
Decatur, IL Weather – 10-16 – Sunny
65° / 46°
Sunny
In Decatur, it will be sunny with highs near 65°F and lows around 46°F. There's a very small chance of rainfall, only about 8% with an estimated 0in. Winds will be strong at speeds peaking at 22mph and gusts of 34.3mph at 7 AM. The humidity will be on the higher side, averaging about 62%, the maximum being 90% at 12 AM and 46% being its lowest at 4 PM. Barometric pressure is its highest of 30.47inHg at 11 PM, a lowest point of 29.91inHg at 12 AM with an avg 30.24inHg.
Decatur, IL Weather – 10-17 – Sunny
58° / 39°
Sunny
Decatur is set for sunshine with temperatures peaking at 58°F and dipping to 39°F. There's a very small chance of rainfall, only about 2%. Wind will be moderate, blowing around 11mph on average and gusts of 24mph at 12 AM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 68% at 7 AM and 32% being its lowest at 4 PM. Barometric pressure is its highest of 30.57inHg at 9 AM, a lowest point of 30.39inHg at 5 PM with an avg 30.47inHg.
Decatur, IL Weather – 10-18 – Sunny
66° / 41°
Sunny
It will be sunny in Decatur, with a high of 66°F and a low of 41°F. There's a very small chance of rainfall, only about 4%. Wind will be moderate, blowing around 11mph on average and gusts of 21.5mph at 1 AM. Humidity levels should be comfortable, sitting around 40% on average, the maximum being 52% at 7 AM and 25% being its lowest at 4 PM. Barometric pressure is its highest of 30.38inHg at 12 AM, a lowest point of 30.21inHg at 4 PM with an avg 30.3inHg.

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