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Mercer, IL Weather Tomorrow

Whether you're planning work or travel, tomorrow's Mercer weather and 5 day forecast offer daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Mercer area.
Updated: Sun Nov 1st 2026 5:15 AM CST
Mercer, IL Weather – 11-1 – Overcast
63° / 57°
Overcast
It will be overcast in Mercer, with a high of 63°F and a low of 57°F. There might be light rainfall having a 25% chance with an estimated 0in. Wind will be moderate, blowing around 13mph on average and gusts of 27.7mph at 2 PM. The humidity will be on the higher side, averaging about 72%, the maximum being 85% at 10 PM and 62% being its lowest at 7 AM. Barometric pressure is its highest of 30.28inHg at 8 AM, a lowest point of 30.15inHg at 11 PM with an avg 30.21inHg.
Mercer, IL Weather – 11-2 – Overcast
66° / 56°

Weather Tomorrow

Overcast
In Mercer, skies will be overcast with highs near 66°F and lows around 56°F. The chance of rain is 76% with an estimated 0.07in. Winds will be strong at speeds peaking at 21mph and gusts of 38.7mph at 11 PM. High humidity with average of 85% is anticipated, the maximum being 91% at 9 PM and 76% being its lowest at 4 PM. Barometric pressure is its highest of 30.14inHg at 12 AM, a lowest point of 29.82inHg at 11 PM with an avg 29.97inHg.
Mercer, IL Weather – 11-3 – Scattered Showers
71° / 61°
Scattered Showers
In Mercer, on and off showers are set to occur with highs near 71°F and lows around 61°F. The chance of rain is 92% with an estimated 0.49in. Winds will be strong at speeds peaking at 21mph and gusts of 41.2mph at 2 AM. High humidity with average of 89% is anticipated, the maximum being 97% at 9 PM and 73% being its lowest at 11 AM. Barometric pressure is its highest of 29.82inHg at 12 AM, a lowest point of 29.69inHg at 9 PM with an avg 29.76inHg.
Mercer, IL Weather – 11-4 – Scattered Showers
61° / 51°
Scattered Showers
Mercer is set for passing showers with temperatures peaking at 61°F and dipping to 51°F. The chance of rain is 79% with an estimated 0.08in. Wind will be moderate, blowing around 12mph on average and gusts of 18.9mph at 12 AM. High humidity with average of 87% is anticipated, the maximum being 97% at 2 AM and 70% being its lowest at 12 PM. Barometric pressure is its highest of 29.71inHg at 1 AM, a lowest point of 29.64inHg at 3 PM with an avg 29.67inHg.
Mercer, IL Weather – 11-5 – Scattered Showers
55° / 47°
Scattered Showers
Highs will reach 55°F with lows near 47°F in Mercer, where scattered showers are. The chance of rain is 76% with an estimated 0.07in. Wind will be moderate, blowing around 13mph on average and gusts of 22.4mph at 5 PM. High humidity with average of 87% is anticipated, the maximum being 94% at 4 AM and 77% being its lowest at 3 PM. Barometric pressure is its highest of 29.74inHg at 11 PM, a lowest point of 29.65inHg at 2 PM with an avg 29.69inHg.
Mercer, IL Weather – 11-6 – Overcast
54° / 49°
Overcast
Highs will reach 54°F with lows near 49°F in Mercer, where overcast is. Rainfall predicted to have a 65% chance with an estimated 0.05in. Wind will be moderate, blowing around 12mph on average and gusts of 21.3mph at 3 AM. The humidity will be on the higher side, averaging about 78%, the maximum being 93% at 12 AM and 68% being its lowest at 1 PM. Barometric pressure is its highest of 29.93inHg at 9 PM, a lowest point of 29.75inHg at 12 AM with an avg 29.86inHg.

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