Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

A Few Clouds

76°F

24°C

Humidity	100%
Wind Speed	W 5 mph
Barometer	30.00 in (1016.8 mb)
Dewpoint	76°F (24°C)
Visibility	10.00 mi
Heat Index	75°F (24°C)
Last update	17 Aug 8:56 am EDT

More Information:

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

Extended Forecast for

2 Miles ESE Potomac MD

Today
High: 95 °F
Mostly Sunny
Tonight
Low: 70 °F
Scattered
T-storms then
Partly Cloudy
Monday
High: 79 °F
Slight Chance
Showers then
Chance
Showers
Monday Night
Low: 67 °F
Chance
Showers
Tuesday
High: 77 °F
Chance
Showers
Tuesday Night
Low: 67 °F
Slight Chance
T-storms then
Slight Chance
Showers
Wednesday
High: 82 °F
Partly Sunny
then Chance
Showers
Wednesday Night
Low: 67 °F
Chance
Showers
Thursday
High: 83 °F
Mostly Sunny
then Chance
Showers

Detailed Forecast

Today

Mostly sunny, with a high near 95. Southwest wind 3 to 6 mph.

Tonight

Scattered showers and thunderstorms, mainly between 7pm and 11pm. Partly cloudy, with a low around 70. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

Monday

A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Northeast wind around 7 mph. Chance of precipitation is 50%.

Monday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. East wind 6 to 8 mph. Chance of precipitation is 40%.

Tuesday

A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 77. East wind around 7 mph. Chance of precipitation is 30%.

Tuesday Night

A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 20%.

Wednesday

A chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.

Wednesday Night

A chance of showers before 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.

Thursday

A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 40%.

Thursday Night

A chance of showers before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%.

Friday

Mostly sunny, with a high near 83.