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Cortland, IL Weather Tomorrow

Tomorrow's Cortland weather report includes an accurate 5 day forecast with precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction for the Cortland area and around DeKalb county, Illinois.
Updated: Thu Oct 22nd 2026 7:00 AM CDT
Cortland, IL Weather – 10-22 – Sunny
70° / 51°
Sunny
Cortland is set for a sunny day with temperatures peaking at 70°F and dipping to 51°F. There's a very small chance of rainfall, only about 5%. Winds will be light at 7mph and gusts of 16.3mph at 9 PM. The humidity will be on the higher side, averaging about 68%, the maximum being 81% at 8 AM and 49% being its lowest at 3 PM. Barometric pressure is its highest of 30.27inHg at 10 AM, a lowest point of 30.2inHg at 5 PM with an avg 30.24inHg.
Cortland, IL Weather – 10-23 – Sunny
69° / 51°

Weather Tomorrow

Sunny
Cortland may see sunshine, with daytime highs of 69°F and overnight lows near 51°F. There's a very small chance of rainfall, only about 6%. Winds will be light at 10mph and gusts of 17.9mph at 11 PM. The humidity will be on the higher side, averaging about 65%, the maximum being 86% at 7 AM and 47% being its lowest at 3 PM. Barometric pressure is its highest of 30.32inHg at 10 AM, a lowest point of 30.24inHg at 3 PM with an avg 30.28inHg.
Cortland, IL Weather – 10-24 – Overcast
68° / 51°
Overcast
Cortland is set for cloud-filled skies with temperatures peaking at 68°F and dipping to 51°F. There might be light rainfall having a 17% chance with an estimated 0in. Wind will be moderate, blowing around 12mph on average and gusts of 20.6mph at 9 AM. The humidity will be on the higher side, averaging about 62%, the maximum being 81% at 7 AM and 44% being its lowest at 3 PM. Barometric pressure is its highest of 30.38inHg at 10 AM, a lowest point of 30.29inHg at 5 PM with an avg 30.32inHg.
Cortland, IL Weather – 10-25 – Overcast
71° / 53°
Overcast
Cortland may see overcast, with daytime highs of 71°F and overnight lows near 53°F. There might be light rainfall having a 12% chance. Winds will be light at 9mph and gusts of 21.8mph at 12 AM. Humidity levels should be comfortable, sitting around 59% on average, the maximum being 75% at 7 AM and 41% being its lowest at 2 PM. Barometric pressure is its highest of 30.38inHg at 10 AM, a lowest point of 30.29inHg at 5 PM with an avg 30.33inHg.
Cortland, IL Weather – 10-26 – Overcast
64° / 51°
Overcast
Cortland is set for overcast with temperatures peaking at 64°F and dipping to 51°F. There might be light rainfall having a 19% chance. Wind will be moderate, blowing around 14mph on average and gusts of 24.4mph at 11 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 92% at 3 AM and 56% being its lowest at 2 PM. Barometric pressure is its highest of 30.39inHg at 9 AM, a lowest point of 30.25inHg at 4 PM with an avg 30.33inHg.
Cortland, IL Weather – 10-27 – Scattered Showers
59° / 49°
Scattered Showers
Cortland may see scattered showers, with daytime highs of 59°F and overnight lows near 49°F. Rainfall predicted to have a 67% chance with an estimated 0.06in. Winds will be light at 7mph and gusts of 24.4mph at 1 AM. The humidity will be on the higher side, averaging about 75%, the maximum being 78% at 7 AM and 68% being its lowest at 1 PM. Barometric pressure is its highest of 30.26inHg at 12 AM, a lowest point of 30.17inHg at 4 PM with an avg 30.2inHg.

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