National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

Portland-Hillsboro Airport (KHIO)

Lat: 45.54765°NLon: 122.95568°WElev: 194.0ft.

Mostly Cloudy

43°F

6°C

Humidity 70%
Wind Speed WNW 9 MPH
Barometer 30.37 in (1028.45 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 21 Mar 11:20 PM PDT
Extended Forecast for

2 Miles WSW Hillsboro OR

  • Tonight

    Tonight: Areas of frost after 2am. Otherwise, mostly clear, with a low around 33. Calm wind.

    Low: 33 °F

    Areas Frost

  • Sunday

    Sunday: Widespread frost, mainly before 8am. Otherwise, mostly sunny, with a high near 58. Calm wind becoming north 5 to 7 mph in the afternoon.

    High: 58 °F

    Frost then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 36. North northwest wind around 6 mph becoming calm after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Monday

    Monday: Areas of frost before 9am. Otherwise, partly sunny, with a high near 58. Calm wind.

    High: 58 °F

    Areas Frost
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 30 percent chance of showers after 11pm. Cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Rain. High near 55. Chance of precipitation is 100%.

    High: 55 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 11pm. Low around 40. Chance of precipitation is 80%.

    Low: 40 °F

    Rain then
    Chance Rain

  • Wednesday

    Wednesday: Rain. Mostly cloudy, with a high near 54.

    High: 54 °F

    Rain

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm. Snow level 2900 feet lowering to 1800 feet after midnight . Partly cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain
    then Mostly
    Clear

Detailed Forecast

Tonight
Areas of frost after 2am. Otherwise, mostly clear, with a low around 33. Calm wind.
Sunday
Widespread frost, mainly before 8am. Otherwise, mostly sunny, with a high near 58. Calm wind becoming north 5 to 7 mph in the afternoon.
Sunday Night
Mostly cloudy, with a low around 36. North northwest wind around 6 mph becoming calm after midnight.
Monday
Areas of frost before 9am. Otherwise, partly sunny, with a high near 58. Calm wind.
Monday Night
A 30 percent chance of showers after 11pm. Cloudy, with a low around 45. Calm wind.
Tuesday
Rain. High near 55. Chance of precipitation is 100%.
Tuesday Night
Rain, mainly before 11pm. Low around 40. Chance of precipitation is 80%.
Wednesday
Rain. Mostly cloudy, with a high near 54.
Wednesday Night
A chance of rain before 11pm. Snow level 2900 feet lowering to 1800 feet after midnight . Partly cloudy, with a low around 34.
Thursday
Mostly sunny, with a high near 56.
Thursday Night
Mostly clear, with a low around 35.
Friday
Mostly sunny, with a high near 62.
Friday Night
Partly cloudy, with a low around 38.
Saturday
Mostly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Hillsboro OR
 45.52°N 122.98°W (Elev. 161 ft)
Last Update:
11:26 pm PDT Mar 21, 2026
Forecast Valid:
11pm PDT Mar 21, 2026-6pm PDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation