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Harvey, IL Weather Tomorrow

See what tomorrow's weather has in store for Harvey with a reliable 5 day forecast 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 Harvey area and around Cook county, Illinois.
Updated: Fri Sep 11th 2026 4:00 AM CDT
Harvey, IL Weather – 9-11 – Sunny
77° / 58°
Sunny
In Harvey, a sunny day is likely with a high near 77°F and a low around 58°F. There's a very small chance of rainfall, only about 4%. Winds will be light at 7mph and gusts of 11.9mph at 11 PM. The humidity will be on the higher side, averaging about 63%, the maximum being 84% at 11 PM and 41% being its lowest at 11 AM. Barometric pressure is its highest of 30.04inHg at 8 AM, a lowest point of 29.91inHg at 10 PM with an avg 29.98inHg.
Harvey, IL Weather – 9-12 – Sunny
83° / 66°

Weather Tomorrow

Sunny
Daytime highs will reach 83°F with lows dropping to 66°F in Harvey, where it will be sunny. There's a very small chance of rainfall, only about 9%. Winds will be light at 10mph and gusts of 14.3mph at 1 AM. The humidity will be on the higher side, averaging about 76%, the maximum being 95% at 7 AM and 53% being its lowest at 4 PM. Barometric pressure is its highest of 29.93inHg at 11 PM, a lowest point of 29.85inHg at 4 PM with an avg 29.89inHg.
Harvey, IL Weather – 9-13 – Overcast
73° / 65°
Overcast
In Harvey, cloud-filled skies are likely with a high near 73°F and a low around 65°F. Rainfall predicted to have a 70% chance with an estimated 0.09in. Wind will be moderate, blowing around 11mph on average and gusts of 20.8mph at 11 PM. The humidity will be on the higher side, averaging about 78%, the maximum being 97% at 7 AM and 58% being its lowest at 7 PM. Barometric pressure is its highest of 30.12inHg at 9 PM, a lowest point of 29.93inHg at 12 AM with an avg 30.03inHg.
Harvey, IL Weather – 9-14 – Sunny
79° / 59°
Sunny
In Harvey, it will be sunny with highs near 79°F and lows around 59°F. Rainfall predicted to have a 57% chance with an estimated 0.06in. Wind will be moderate, blowing around 16mph on average and gusts of 40.5mph at 11 PM. The humidity will be on the higher side, averaging about 72%, the maximum being 84% at 10 PM and 59% being its lowest at 7 AM. Barometric pressure is its highest of 30.16inHg at 8 AM, a lowest point of 29.91inHg at 11 PM with an avg 30.06inHg.
Harvey, IL Weather – 9-15 – Sunny
88° / 73°
Sunny
A sunny day is in the forecast for Harvey, with a high of 88°F and a low of 73°F. Rainfall predicted to have a 57% chance with an estimated 0.11in. Wind will be moderate, blowing around 17mph on average and gusts of 42.5mph at 3 AM. The humidity will be on the higher side, averaging about 67%, the maximum being 92% at 10 PM and 53% being its lowest at 4 PM. Barometric pressure is its highest of 30.04inHg at 11 PM, a lowest point of 29.89inHg at 3 AM with an avg 29.97inHg.
Harvey, IL Weather – 9-16 – Light Rain Shower
75° / 63°
Light Rain Shower
Harvey is set for rain with temperatures peaking at 75°F and dipping to 63°F. The chance of rain is 89% with an estimated 0.21in. Wind will be moderate, blowing around 14mph on average and gusts of 25.1mph at 7 PM. High humidity with average of 93% is anticipated, the maximum being 99% at 7 AM and 87% being its lowest at 4 PM. Barometric pressure is its highest of 30.19inHg at 11 PM, a lowest point of 30.03inHg at 1 AM with an avg 30.12inHg.

Currently

Clear 60°F
30.03 inHg.
Barometer
66%
Humidity
ESE 5 mph
Wind
Clear

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