Heat Persists in the South Central U.S. and Southwest; Heavy rains in the Desert Southwest and Central Plains

Sweltering heat remains across the South-Central Plains, Lower/Middle Mississippi Valley, and the Southwest this week with limited nighttime relief. Thunderstorms will bring heavy rainfall leading to localized flash flooding in portions of the Desert Southwest and central Plains. Isolated strong to severe thunderstorms are possible across portions of the central Plains into the Northeast. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

68°F

20°C

Humidity	81%
Wind Speed	S 5 mph
Barometer	30.25 in (1025.6 mb)
Dewpoint	62°F (17°C)
Visibility	10.00 mi
Last update	9 Sep 7:56 am EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Olney MD

Today
High: 87 °F
Mostly Sunny
Tonight
Low: 71 °F
Mostly Clear
Thursday
High: 86 °F
Mostly Sunny
then Chance
T-storms
Thursday Night
Low: 66 °F
Showers
Likely
Friday
High: 81 °F
Mostly Sunny
Friday Night
Low: 64 °F
Mostly Cloudy
Saturday
High: 80 °F
Chance
Showers
Saturday Night
Low: 68 °F
Chance
Showers
Sunday
High: 82 °F
Mostly Cloudy
then Slight
Chance
T-storms

Detailed Forecast

Today

Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph, with gusts as high as 18 mph.

Tonight

Mostly clear, with a low around 71. South wind around 10 mph, with gusts as high as 21 mph.

Thursday

A chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 86. West wind 6 to 9 mph. Chance of precipitation is 30%.

Thursday Night

Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am. Mostly cloudy, with a low around 66. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday

Mostly sunny, with a high near 81. North wind 3 to 6 mph.

Friday Night

Mostly cloudy, with a low around 64.

Saturday

A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 50%.

Saturday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.

Sunday

A slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 20%.

Sunday Night

Partly cloudy, with a low around 68.