Dangerous Heat and Humidity Building from the Plains to the East Coast

Strengthening high pressure will bring much above normal high and low temperatures. Widespread highs in the 90s to 100 combined with dewpoints surging into the mid and upper 70s will create heat indices as high as 110 through this weekend. In addition, overnight temperatures in the 70s to low 80s will reduce the ability of the body to recover from daytime heating. Read More >

Hazardous Weather Conditions

En Español

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Mostly Cloudy

80°F

27°C

Humidity	90%
Wind Speed	S 7 mph
Barometer	29.90 in (1012.7 mb)
Dewpoint	77°F (25°C)
Visibility	10.00 mi
Heat Index	86°F (30°C)
Last update	17 Jul 5:53 pm EDT

More Information:

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

Extended Forecast for

Chambersburg PA

Excessive Heat Watch July 19, 12:00pm until July 21, 10:00pm

Click here for hazard details and duration

Excessive Heat Watch

Tonight

Heavy Rain
Low: 71 °F
Thursday

Chance
T-storms
High: 90 °F
Thursday
Night

Partly Cloudy
Low: 72 °F
Friday

Hot
High: 95 °F
Friday
Night

Mostly Clear
Low: 77 °F
Saturday

Hot
High: 98 °F
Saturday
Night

Partly Cloudy
Low: 77 °F
Sunday

Chance
T-storms
High: 95 °F
Sunday
Night

Chance
T-storms
Low: 73 °F

Detailed Forecast

Tonight

Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 5am, then a slight chance of showers and thunderstorms after 5am. Some of the storms could produce gusty winds and heavy rain. Low around 71. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday

A chance of showers and thunderstorms, mainly after 8am. Mostly cloudy, with a high near 90. Light west wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Partly cloudy, with a low around 72. Calm wind.

Friday

Mostly sunny and hot, with a high near 95. Heat index values as high as 102. Calm wind becoming west 5 to 7 mph in the afternoon.

Friday Night

Mostly clear, with a low around 77. West wind 3 to 5 mph.

Saturday

Sunny and hot, with a high near 98.

Saturday Night

Partly cloudy, with a low around 77.

Sunday

A chance of showers and thunderstorms. Mostly sunny and hot, with a high near 95. Chance of precipitation is 40%.