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Hillsboro, OR Weather Tomorrow

For a complete weather outlook, review tomorrow's Hillsboro forecast and the following 5 days 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 Hillsboro area and around Washington county, Oregon.
Updated: Mon Aug 31st 2026 9:00 AM PDT
Hillsboro, OR Weather – 8-31 – Overcast
85° / 54°
Overcast
Hillsboro may see overcast, with daytime highs of 85°F and overnight lows near 54°F. There's a very small chance of rainfall, only about 7%. Winds will be light at 6mph and gusts of 13.3mph at 9 PM. Humidity levels should be comfortable, sitting around 54% on average, the maximum being 70% at 11 PM and 25% being its lowest at 4 PM. Barometric pressure is its highest of 29.87inHg at 10 AM, a lowest point of 29.72inHg at 5 PM with an avg 29.78inHg.
Hillsboro, OR Weather – 9-1 – Partly Cloudy
78° / 55°

Weather Tomorrow

Partly Cloudy
Hillsboro may see overcast conditions, with daytime highs of 78°F and overnight lows near 55°F. There's a very small chance of rainfall, only about 10%. Winds will be light at 9mph and gusts of 19.2mph at 5 PM. The humidity will be on the higher side, averaging about 66%, the maximum being 89% at 7 AM and 38% being its lowest at 3 PM. Barometric pressure is its highest of 29.9inHg at 8 AM, a lowest point of 29.8inHg at 4 PM with an avg 29.85inHg.
Hillsboro, OR Weather – 9-2 – Overcast
65° / 55°
Overcast
In Hillsboro, overcast is likely with a high near 65°F and a low around 55°F. The chance of rain is 85% with an estimated 0.26in. Wind will be moderate, blowing around 12mph on average and gusts of 30mph at 6 PM. High humidity with average of 82% is anticipated, the maximum being 97% at 10 PM and 55% being its lowest at 1 PM. Barometric pressure is its highest of 29.9inHg at 1 AM, a lowest point of 29.78inHg at 6 PM with an avg 29.84inHg.
Hillsboro, OR Weather – 9-3 – Scattered Showers
71° / 50°
Scattered Showers
Hillsboro could see scattered showers with daytime highs of 71°F and nighttime lows near 50°F. Rainfall predicted to have a 68% chance with an estimated 0.08in. Winds will be light at 9mph and gusts of 16.3mph at 4 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 99% at 3 AM and 38% being its lowest at 3 PM. Barometric pressure is its highest of 29.93inHg at 11 PM, a lowest point of 29.82inHg at 3 AM with an avg 29.86inHg.
Hillsboro, OR Weather – 9-4 – Light Rain Shower
67° / 47°
Light Rain Shower
Daytime highs will reach 67°F with lows dropping to 47°F in Hillsboro, where periods of rain are likely. The chance of rain is 80% with an estimated 0.17in. Winds will be light at 3mph and gusts of 12.8mph at 6 AM. High humidity with average of 87% is anticipated, the maximum being 96% at 11 PM and 47% being its lowest at 3 PM. Barometric pressure is its highest of 29.99inHg at 4 PM, a lowest point of 29.88inHg at 3 PM with an avg 29.95inHg.
Hillsboro, OR Weather – 9-5 – Sunny
77° / 52°
Sunny
Hillsboro is set for a sunny day with temperatures peaking at 77°F and dipping to 52°F. There's a very small chance of rainfall, only about 7% with an estimated 0in. Winds will be light at 5mph and gusts of 9.6mph at 11 PM. The humidity will be on the higher side, averaging about 66%, the maximum being 96% at 5 AM and 29% being its lowest at 5 PM. Barometric pressure is its highest of 29.99inHg at 12 AM, a lowest point of 29.91inHg at 5 PM with an avg 29.96inHg.

Currently

Overcast 66°F
29.89 inHg.
Barometer
56%
Humidity
NNE 5 mph
Wind
Overcast

5 Day Forecast Nearby

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