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Modesto, IL Weather Tomorrow

See what tomorrow's weather has in store for Modesto with a reliable 5 day forecast featuring daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Modesto area and around Macoupin county, Illinois.
Updated: Tue Sep 8th 2026 5:00 AM CDT
Modesto, IL Weather – 9-8 – Sunny
91° / 64°
Sunny
Daytime highs will reach 91°F with lows dropping to 64°F in Modesto, where bright and sunny conditions. There's a very small chance of rainfall, only about 5%. Wind will be moderate, blowing around 11mph on average and gusts of 26.8mph at 10 PM. Humidity levels should be comfortable, sitting around 48% on average, the maximum being 74% at 6 AM and 27% being its lowest at 4 PM. Barometric pressure is its highest of 30.11inHg at 8 AM, a lowest point of 29.99inHg at 6 PM with an avg 30.05inHg.
Modesto, IL Weather – 9-9 – Sunny
93° / 74°

Weather Tomorrow

Sunny
In Modesto, a sunny day is likely with a high near 93°F and a low around 74°F. Rainfall predicted to have a 58% chance with an estimated 0.15in. Wind will be moderate, blowing around 12mph on average and gusts of 33.2mph at 3 AM. The humidity will be on the higher side, averaging about 62%, the maximum being 94% at 10 PM and 39% being its lowest at 2 PM. Barometric pressure is its highest of 30.04inHg at 9 AM, a lowest point of 29.92inHg at 4 PM with an avg 29.98inHg.
Modesto, IL Weather – 9-10 – Overcast
85° / 71°
Overcast
Modesto could see cloud-filled skies with daytime highs of 85°F and nighttime lows near 71°F. Rainfall predicted to have a 69% chance with an estimated 0.07in. Winds will be light at 9mph and gusts of 19.9mph at 9 PM. The humidity will be on the higher side, averaging about 78%, the maximum being 97% at 6 AM and 51% being its lowest at 4 PM. Barometric pressure is its highest of 29.97inHg at 11 AM, a lowest point of 29.87inHg at 6 PM with an avg 29.94inHg.
Modesto, IL Weather – 9-11 – Sunny
92° / 69°
Sunny
Bright and sunny conditions in Modesto, with a high of 92°F and a low of 69°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 27.1mph at 10 PM. The humidity will be on the higher side, averaging about 68%, the maximum being 97% at 6 AM and 30% being its lowest at 5 PM. Barometric pressure is its highest of 29.94inHg at 1 AM, a lowest point of 29.78inHg at 6 PM with an avg 29.87inHg.
Modesto, IL Weather – 9-12 – Sunny
94° / 70°
Sunny
Modesto could see a sunny day with daytime highs of 94°F and nighttime lows near 70°F. There might be light rainfall having a 17% chance with an estimated 0.01in. Wind will be moderate, blowing around 11mph on average and gusts of 24.8mph at 11 PM. The humidity will be on the higher side, averaging about 63%, the maximum being 90% at 7 AM and 40% being its lowest at 4 PM. Barometric pressure is its highest of 29.93inHg at 9 AM, a lowest point of 29.82inHg at 6 PM with an avg 29.86inHg.
Modesto, IL Weather – 9-13 – Sunny
99° / 75°
Sunny
Highs will reach 99°F with lows near 75°F in Modesto, where a sunny day is. There's a very small chance of rainfall, only about 7% with an estimated 0in. Wind will be moderate, blowing around 17mph on average and gusts of 32.1mph at 10 PM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 84% at 7 AM and 27% being its lowest at 4 PM. Barometric pressure is its highest of 29.94inHg at 7 AM, a lowest point of 29.81inHg at 6 PM with an avg 29.87inHg.

Currently

Cloudy 65°F
30.08 inHg.
Barometer
73%
Humidity
SE 12.2 mph
Wind
Cloudy

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