Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Fair

70°F

21°C

Humidity	100%
Wind Speed	Calm
Barometer	29.86 in
Dewpoint	70°F (21°C)
Visibility	8.00 mi
Last update	18 Aug 4:55 am EDT

More Information:

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

Extended Forecast for

Downingtown PA

Today
High: 86 °F
Patchy Fog
then Isolated
T-storms
Tonight
Low: 64 °F
Mostly Clear
then Patchy
Fog
Wednesday
High: 87 °F
Patchy Fog
then Sunny
Wednesday Night
Low: 68 °F
Partly Cloudy
then Slight
Chance
Showers
Thursday
High: 83 °F
Chance
Showers then
Showers
Likely
Thursday Night
Low: 63 °F
Showers
Likely
Friday
High: 82 °F
Partly Sunny
Friday Night
Low: 65 °F
Chance
Showers
Saturday
High: 81 °F
Chance
Showers

Detailed Forecast

Today

Isolated showers and thunderstorms after 2pm. Patchy fog before 10am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 20%.

Tonight

Patchy fog after 5am. Otherwise, mostly clear, with a low around 64. Calm wind.

Wednesday

Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon.

Wednesday Night

A slight chance of showers after 2am. Partly cloudy, with a low around 68. Calm wind. Chance of precipitation is 20%.

Thursday

A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 83. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Showers and thunderstorms likely before 11pm, then a chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday

Partly sunny, with a high near 82.

Friday Night

A chance of showers after 8pm. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.

Saturday

A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 50%.

Saturday Night

Showers likely, mainly before 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

Sunday

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

Sunday Night

A chance of showers. Partly cloudy, with a low around 62. Chance of precipitation is 30%.