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.

Overcast

45°F

7°C

Humidity 75%
Wind Speed NNE 3 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 21 Mar 05:30 AM PDT
Extended Forecast for

Hillsboro OR

  • Today

    Today: Sunny, with a high near 56. Light north northwest wind.

    High: 56 °F

    Sunny

  • Tonight

    Tonight: Widespread frost, mainly after 3am. Otherwise, mostly clear, with a low around 32. Light west northwest wind.

    Low: 32 °F

    Mostly Clear
    then Frost

  • Sunday

    Sunday: Widespread frost before 9am. Otherwise, mostly sunny, with a high near 58. Calm wind becoming north around 5 mph in the afternoon.

    High: 58 °F

    Frost then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 37. North wind around 6 mph becoming calm after midnight.

    Low: 37 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 57. Calm wind.

    High: 57 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of rain after 11pm. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain. High near 57. Chance of precipitation is 90%.

    High: 57 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 11pm. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Rain Likely

  • Wednesday

    Wednesday: Rain likely. Mostly cloudy, with a high near 56.

    High: 56 °F

    Rain Likely

Detailed Forecast

Today
Sunny, with a high near 56. Light north northwest wind.
Tonight
Widespread frost, mainly after 3am. Otherwise, mostly clear, with a low around 32. Light west northwest wind.
Sunday
Widespread frost before 9am. Otherwise, mostly sunny, with a high near 58. Calm wind becoming north around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 37. North wind around 6 mph becoming calm after midnight.
Monday
Mostly cloudy, with a high near 57. Calm wind.
Monday Night
A 40 percent chance of rain after 11pm. Mostly cloudy, with a low around 44.
Tuesday
Rain. High near 57. Chance of precipitation is 90%.
Tuesday Night
Rain likely, mainly before 11pm. Mostly cloudy, with a low around 41.
Wednesday
Rain likely. Mostly cloudy, with a high near 56.
Wednesday Night
A chance of rain, mainly before 11pm. Partly cloudy, with a low around 35.
Thursday
A slight chance of rain. Snow level 2000 feet rising to 2800 feet in the afternoon. Mostly sunny, with a high near 56.
Thursday Night
Mostly clear, with a low around 35.
Friday
Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hillsboro OR
 45.53°N 122.92°W (Elev. 200 ft)
Last Update:
5:41 am PDT Mar 21, 2026
Forecast Valid:
5am PDT Mar 21, 2026-6pm PDT Mar 27, 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