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

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

36°F

2°C

Humidity 34%
Wind Speed S 8 mph
Barometer 30.41 in (1032.0 mb)
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 18 Mar 12:56 pm EDT
Extended Forecast for

Olney MD

  • This Afternoon

    This Afternoon: Sunny, with a high near 40. South wind around 6 mph.

    High: 40 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 30. Southeast wind 3 to 5 mph.

    Low: 30 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Partly sunny, with a high near 52. South wind 5 to 7 mph.

    High: 52 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers after 2pm. Partly sunny, with a high near 61. Calm wind becoming south 5 to 8 mph in the afternoon. Chance of precipitation is 20%.

    High: 61 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers before 8am. Mostly sunny, with a high near 65. Chance of precipitation is 30%.

    High: 65 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers after 2pm. Mostly cloudy, with a high near 70. Chance of precipitation is 30%.

    High: 70 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 40. South wind around 6 mph.
Tonight
Increasing clouds, with a low around 30. Southeast wind 3 to 5 mph.
Thursday
Partly sunny, with a high near 52. South wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 37. Calm wind.
Friday
A slight chance of showers after 2pm. Partly sunny, with a high near 61. Calm wind becoming south 5 to 8 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.
Saturday
A chance of showers before 8am. Mostly sunny, with a high near 65. Chance of precipitation is 30%.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
A chance of showers after 2pm. Mostly cloudy, with a high near 70. Chance of precipitation is 30%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 43. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
1:21 pm EDT Mar 18, 2026
Forecast Valid:
1pm EDT Mar 18, 2026-6pm EDT Mar 24, 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