Washington County, PA Weather Tomorrow

Review tomorrow's weather in Washington County and the upcoming 5 day forecast with precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction for the Washington County area.
Updated: Thu Oct 15th 2026 7:15 PM EDT
Washington County, PA Weather – 10-15 – Mist
70° / 51°
Mist
In Washington County, mist is likely with a high near 70°F and a low around 51°F. There's a moderate 28% chance of rainfall with an estimated 0in. Winds will be light at 10mph and gusts of 26.2mph at 11 PM. High humidity with average of 88% is anticipated, the maximum being 97% at 11 PM and 93% being its lowest at 8 PM. Barometric pressure is its highest of 29.98inHg at 8 PM, a lowest point of 29.92inHg at 11 PM with an avg 29.96inHg.
Washington County, PA Weather – 10-16 – Scattered Showers
70° / 48°

Weather Tomorrow

Scattered Showers
In Washington County, passing showers are likely with a high near 70°F and a low around 48°F. The chance of rain is 91% with an estimated 0.34in. Wind will be moderate, blowing around 16mph on average and gusts of 36.5mph at 4 AM. High humidity with average of 94% is anticipated, the maximum being 98% at 12 AM and 88% being its lowest at 5 AM. Barometric pressure is its highest of 30.01inHg at 11 PM, a lowest point of 29.76inHg at 12 PM with an avg 29.86inHg.
Washington County, PA Weather – 10-17 – Sunny
50° / 36°
Sunny
Washington County may see a sunny day, with daytime highs of 50°F and overnight lows near 36°F. There might be light rainfall having a 20% chance with an estimated 0.01in. Wind will be moderate, blowing around 16mph on average and gusts of 28.2mph at 5 AM. The humidity will be on the higher side, averaging about 65%, the maximum being 92% at 12 AM and 38% being its lowest at 4 PM. Barometric pressure is its highest of 30.55inHg at 11 PM, a lowest point of 30.04inHg at 1 AM with an avg 30.33inHg.
Washington County, PA Weather – 10-18 – Sunny
59° / 32°
Sunny
Daytime highs will reach 59°F with lows dropping to 32°F in Washington County, where bright and sunny conditions. There's a very small chance of rainfall, only about 2%. Winds will be light at 6mph and gusts of 14.3mph at 4 AM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 68% at 3 AM and 32% being its lowest at 2 PM. Barometric pressure is its highest of 30.64inHg at 9 AM, a lowest point of 30.49inHg at 6 PM with an avg 30.56inHg.
Washington County, PA Weather – 10-19 – Sunny
63° / 38°
Sunny
Washington County is set for a sunny day with temperatures peaking at 63°F and dipping to 38°F. There's a very small chance of rainfall, only about 3%. Winds will be light at 6mph and gusts of 16.6mph at 4 AM. Humidity levels should be comfortable, sitting around 58% on average, the maximum being 74% at 11 PM and 39% being its lowest at 2 PM. Barometric pressure is its highest of 30.56inHg at 3 AM, a lowest point of 30.4inHg at 6 PM with an avg 30.49inHg.
Washington County, PA Weather – 10-20 – Sunny
63° / 41°
Sunny
Highs will reach 63°F with lows near 41°F in Washington County, where sunshine is. There's a very small chance of rainfall, only about 8%. Winds will be light at 6mph and gusts of 12.8mph at 5 AM. The humidity will be on the higher side, averaging about 72%, the maximum being 86% at 7 AM and 50% being its lowest at 2 PM. Barometric pressure is its highest of 30.41inHg at 1 AM, a lowest point of 30.29inHg at 5 PM with an avg 30.36inHg.

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