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Herrin, IL Weather Tomorrow

Review tomorrow's weather in Herrin and the upcoming 5 day forecast with precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction for the Herrin area and around Williamson county, Illinois.
Updated: Sat Sep 5th 2026 8:15 AM CDT
Herrin, IL Weather – 9-5 – Sunny
103° / 78°
Sunny
Herrin may see sunshine, with daytime highs of 103°F and overnight lows near 78°F. There's a moderate 36% chance of rainfall with an estimated 0.02in. Wind will be moderate, blowing around 13mph on average and gusts of 21.7mph at 6 PM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 82% at 11 PM and 24% being its lowest at 3 PM. Barometric pressure is its highest of 29.93inHg at 10 AM, a lowest point of 29.79inHg at 4 PM with an avg 29.86inHg.
Herrin, IL Weather – 9-6 – Sunny
95° / 72°

Weather Tomorrow

Sunny
In Herrin, it will be sunny with highs near 95°F and lows around 72°F. There might be light rainfall having a 17% chance with an estimated 0.01in. Wind will be moderate, blowing around 13mph on average and gusts of 26.9mph at 11 PM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 94% at 7 AM and 26% being its lowest at 4 PM. Barometric pressure is its highest of 29.98inHg at 11 PM, a lowest point of 29.86inHg at 12 AM with an avg 29.91inHg.
Herrin, IL Weather – 9-7 – Sunny
93° / 62°
Sunny
Highs will reach 93°F with lows near 62°F in Herrin, where sunshine is. There's a very small chance of rainfall, only about 3%. Wind will be moderate, blowing around 11mph on average and gusts of 26.7mph at 12 AM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 94% at 6 AM and 20% being its lowest at 4 PM. Barometric pressure is its highest of 30.06inHg at 8 AM, a lowest point of 29.95inHg at 5 PM with an avg 30.01inHg.
Herrin, IL Weather – 9-8 – Sunny
98° / 70°
Sunny
Bright and sunny conditions in Herrin, with a high of 98°F and a low of 70°F. There's a very small chance of rainfall, only about 2%. Wind will be moderate, blowing around 12mph on average and gusts of 31.8mph at 11 PM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 81% at 7 AM and 27% being its lowest at 5 PM. Barometric pressure is its highest of 30.09inHg at 10 AM, a lowest point of 29.98inHg at 5 PM with an avg 30.04inHg.
Herrin, IL Weather – 9-9 – Sunny
101° / 77°
Sunny
Herrin may see sunshine, with daytime highs of 101°F and overnight lows near 77°F. Rainfall predicted to have a 57% chance with an estimated 0.07in. Wind will be moderate, blowing around 16mph on average and gusts of 35.3mph at 2 AM. Humidity levels should be comfortable, sitting around 48% on average, the maximum being 70% at 11 PM and 25% being its lowest at 1 PM. Barometric pressure is its highest of 30.13inHg at 8 AM, a lowest point of 29.96inHg at 6 PM with an avg 30.04inHg.
Herrin, IL Weather – 9-10 – Sunny
101° / 74°
Sunny
Herrin may see sunshine, with daytime highs of 101°F and overnight lows near 74°F. There's a moderate 36% chance of rainfall with an estimated 0.04in. Winds will be light at 8mph and gusts of 23.1mph at 10 PM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 90% at 7 AM and 19% being its lowest at 4 PM. Barometric pressure is its highest of 30.06inHg at 10 AM, a lowest point of 29.92inHg at 6 PM with an avg 29.99inHg.

Currently

Sunny 85°F
29.92 inHg.
Barometer
57%
Humidity
WSW 11.9 mph
Wind
Sunny

5 Day Forecast Nearby

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