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Decatur, OH Weather Tomorrow

Tomorrow's weather forecast for Decatur is supported by a complete 5 day outlook covering daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Decatur area and around Brown county, Ohio.
Updated: Thu Oct 1st 2026 5:30 PM EDT
Decatur, OH Weather – 10-1 – Overcast
94° / 62°
Overcast
Cloud-filled skies are in the forecast for Decatur, with a high of 94°F and a low of 62°F. There's a very small chance of rainfall, only about 7%. Wind will be moderate, blowing around 13mph on average and gusts of 30.6mph at 11 PM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 51% at 9 PM and 37% being its lowest at 6 PM. Barometric pressure is its highest of 29.96inHg at 10 PM, a lowest point of 29.92inHg at 6 PM with an avg 29.94inHg.
Decatur, OH Weather – 10-2 – Overcast
73° / 57°

Weather Tomorrow

Overcast
Daytime highs will reach 73°F with lows dropping to 57°F in Decatur, where skies will be overcast. The chance of rain is 87% with an estimated 0.7in. Wind will be moderate, blowing around 12mph on average and gusts of 35.1mph at 5 AM. High humidity with average of 81% is anticipated, the maximum being 98% at 12 PM and 53% being its lowest at 12 AM. Barometric pressure is its highest of 30.17inHg at 11 PM, a lowest point of 29.93inHg at 4 AM with an avg 30.03inHg.
Decatur, OH Weather – 10-3 – Overcast
70° / 53°
Overcast
It will be overcast in Decatur, with a high of 70°F and a low of 53°F. There's a very small chance of rainfall, only about 10% with an estimated 0in. Wind will be moderate, blowing around 11mph on average and gusts of 23.8mph at 9 AM. The humidity will be on the higher side, averaging about 62%, the maximum being 87% at 12 AM and 37% being its lowest at 4 PM. Barometric pressure is its highest of 30.23inHg at 9 AM, a lowest point of 30.14inHg at 5 PM with an avg 30.18inHg.
Decatur, OH Weather – 10-4 – Overcast
74° / 55°
Overcast
Decatur is set for overcast with temperatures peaking at 74°F and dipping to 55°F. There might be light rainfall having a 13% chance. Winds will be light at 7mph and gusts of 13.5mph at 8 PM. Humidity levels should be comfortable, sitting around 59% on average, the maximum being 73% at 10 PM and 38% being its lowest at 5 PM. Barometric pressure is its highest of 30.15inHg at 10 PM, a lowest point of 30.04inHg at 5 PM with an avg 30.11inHg.
Decatur, OH Weather – 10-5 – Sunny
68° / 48°
Sunny
Bright and sunny conditions in Decatur, with a high of 68°F and a low of 48°F. There's a very small chance of rainfall, only about 4%. Wind will be moderate, blowing around 12mph on average and gusts of 23.5mph at 9 AM. The humidity will be on the higher side, averaging about 63%, the maximum being 97% at 6 AM and 30% being its lowest at 3 PM. Barometric pressure is its highest of 30.27inHg at 11 PM, a lowest point of 30.14inHg at 12 AM with an avg 30.2inHg.
Decatur, OH Weather – 10-6 – Sunny
65° / 41°
Sunny
Daytime highs will reach 65°F with lows dropping to 41°F in Decatur, where it will be sunny. There's a very small chance of rainfall, only about 3%. Winds will be light at 10mph and gusts of 20.1mph at 1 AM. Humidity levels should be comfortable, sitting around 57% on average, the maximum being 79% at 6 AM and 29% being its lowest at 5 PM. Barometric pressure is its highest of 30.28inHg at 1 AM, a lowest point of 30.09inHg at 5 PM with an avg 30.2inHg.

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