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Belvidere, IL Weather Tomorrow

Review tomorrow's weather in Belvidere and the upcoming 5 day forecast with daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Belvidere area and around Boone county, Illinois.
Updated: Sun Sep 20th 2026 12:45 PM CDT
Belvidere, IL Weather – 9-20 – Light Rain Shower
68° / 59°
Light Rain Shower
Belvidere could see rain with daytime highs of 68°F and nighttime lows near 59°F. The chance of rain is 93% with an estimated 2.85in. Wind will be moderate, blowing around 17mph on average and gusts of 31.6mph at 7 PM. High humidity with average of 95% is anticipated, the maximum being 96% at 2 PM and 88% being its lowest at 10 PM. Barometric pressure is its highest of 30.07inHg at 9 PM, a lowest point of 29.99inHg at 2 PM with an avg 30.03inHg.
Belvidere, IL Weather – 9-21 – Overcast
59° / 55°

Weather Tomorrow

Overcast
Belvidere is set for overcast with temperatures peaking at 59°F and dipping to 55°F. Rainfall predicted to have a 58% chance with an estimated 0.03in. Wind will be moderate, blowing around 16mph on average and gusts of 29.5mph at 2 AM. The humidity will be on the higher side, averaging about 79%, the maximum being 92% at 12 AM and 73% being its lowest at 11 PM. Barometric pressure is its highest of 30.17inHg at 10 PM, a lowest point of 30.07inHg at 12 AM with an avg 30.12inHg.
Belvidere, IL Weather – 9-22 – Overcast
58° / 52°
Overcast
Highs will reach 58°F with lows near 52°F in Belvidere, where overcast is. There might be light rainfall having a 15% chance with an estimated 0in. Wind will be moderate, blowing around 14mph on average and gusts of 25.5mph at 12 AM. The humidity will be on the higher side, averaging about 68%, the maximum being 75% at 11 PM and 61% being its lowest at 3 PM. Barometric pressure is its highest of 30.3inHg at 8 PM, a lowest point of 30.17inHg at 12 AM with an avg 30.25inHg.
Belvidere, IL Weather – 9-23 – Sunny
60° / 51°
Sunny
Daytime highs will reach 60°F with lows dropping to 51°F in Belvidere, where it will be sunny. There might be light rainfall having a 23% chance with an estimated 0in. Wind will be moderate, blowing around 13mph on average and gusts of 26.2mph at 12 AM. High humidity with average of 84% is anticipated, the maximum being 95% at 7 AM and 76% being its lowest at 12 AM. Barometric pressure is its highest of 30.37inHg at 9 PM, a lowest point of 30.3inHg at 12 AM with an avg 30.34inHg.
Belvidere, IL Weather – 9-24 – Overcast
65° / 52°
Overcast
Belvidere may see overcast, with daytime highs of 65°F and overnight lows near 52°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 24.9mph at 8 AM. The humidity will be on the higher side, averaging about 79%, the maximum being 94% at 10 PM and 57% being its lowest at 12 PM. Barometric pressure is its highest of 30.38inHg at 10 AM, a lowest point of 30.18inHg at 4 PM with an avg 30.33inHg.
Belvidere, IL Weather – 9-25 – Scattered Showers
63° / 54°
Scattered Showers
Scattered showers are in the forecast for Belvidere, with a high of 63°F and a low of 54°F. There's a moderate 48% chance of rainfall with an estimated 0.02in. Winds will be light at 9mph and gusts of 14.3mph at 12 AM. High humidity with average of 88% is anticipated, the maximum being 95% at 10 PM and 77% being its lowest at 1 PM. Barometric pressure is its highest of 30.35inHg at 12 AM, a lowest point of 30.18inHg at 4 PM with an avg 30.21inHg.

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