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Round Knob, IL Weather Tomorrow

See tomorrow's forecast for Round Knob together with a reliable 5 day outlook featuring precipitation probability, daily and nightly weather conditions, high and low temperature trends, sunrise and sunset information, sky cover, wind speed, wind direction, and wind chill for the Round Knob area and around Massac county, Illinois.
Updated: Wed Oct 14th 2026 9:00 AM CDT
Round Knob, IL Weather – 10-14 – Scattered Showers
79° / 71°
Scattered Showers
In Round Knob, showers likely at times with highs near 79°F and lows around 71°F. The chance of rain is 84% with an estimated 0.28in. Winds will be light at 9mph and gusts of 11.2mph at 1 PM. High humidity with average of 87% is anticipated, the maximum being 96% at 11 PM and 81% being its lowest at 4 PM. Barometric pressure is its highest of 30.02inHg at 10 AM, a lowest point of 29.97inHg at 3 PM with an avg 30inHg.
Round Knob, IL Weather – 10-15 – Sunny
91° / 69°

Weather Tomorrow

Sunny
Bright and sunny conditions in Round Knob, with a high of 91°F and a low of 69°F. Rainfall predicted to have a 62% chance with an estimated 0.14in. Wind will be moderate, blowing around 15mph on average and gusts of 27.5mph at 10 PM. The humidity will be on the higher side, averaging about 67%, the maximum being 98% at 4 AM and 34% being its lowest at 3 PM. Barometric pressure is its highest of 30.02inHg at 12 AM, a lowest point of 29.9inHg at 5 PM with an avg 29.97inHg.
Round Knob, IL Weather – 10-16 – Sunny
76° / 48°
Sunny
Round Knob may see sunshine, with daytime highs of 76°F and overnight lows near 48°F. There's a very small chance of rainfall, only about 7% with an estimated 0in. Winds will be strong at speeds peaking at 22mph and gusts of 28.9mph at 6 AM. Humidity levels should be comfortable, sitting around 58% on average, the maximum being 82% at 5 AM and 38% being its lowest at 1 PM. Barometric pressure is its highest of 30.36inHg at 11 PM, a lowest point of 29.9inHg at 1 AM with an avg 30.12inHg.
Round Knob, IL Weather – 10-17 – Sunny
64° / 45°
Sunny
Round Knob could see a sunny day with daytime highs of 64°F and nighttime lows near 45°F. There's a very small chance of rainfall, only about 3%. Wind will be moderate, blowing around 13mph on average and gusts of 25.3mph at 1 AM. Humidity levels should be comfortable, sitting around 54% on average, the maximum being 82% at 7 AM and 29% being its lowest at 4 PM. Barometric pressure is its highest of 30.5inHg at 9 AM, a lowest point of 30.36inHg at 12 AM with an avg 30.42inHg.
Round Knob, IL Weather – 10-18 – Sunny
71° / 42°
Sunny
Daytime highs will reach 71°F with lows dropping to 42°F in Round Knob, where bright and sunny conditions. There's a very small chance of rainfall, only about 2%. Winds will be light at 10mph and gusts of 29.1mph at 11 PM. Humidity levels should be comfortable, sitting around 48% on average, the maximum being 67% at 7 AM and 29% being its lowest at 3 PM. Barometric pressure is its highest of 30.42inHg at 8 AM, a lowest point of 30.27inHg at 4 PM with an avg 30.36inHg.
Round Knob, IL Weather – 10-19 – Overcast
73° / 46°
Overcast
Round Knob may see cloud-filled skies, with daytime highs of 73°F and overnight lows near 46°F. There's a very small chance of rainfall, only about 10%. Winds will be light at 9mph and gusts of 28.4mph at 12 AM. Humidity levels should be comfortable, sitting around 50% on average, the maximum being 64% at 11 PM and 35% being its lowest at 1 PM. Barometric pressure is its highest of 30.39inHg at 10 AM, a lowest point of 30.26inHg at 4 PM with an avg 30.32inHg.

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