Briefing for Heat, Severe Storm, and Flash Flood Risks through Thursday

Dangerously hot and humid conditions are expected through Wednesday. There is also a threat of isolated severe thunderstorms on Wednesday. Flash flooding from locally heavy rainfall is possible on Thursday. See this briefing for details on these hazards. Read More >

Hazardous Weather Conditions

Current conditions at

Brandywine Regional Airport (KOQN)

Lat: 39.99°NLon: 75.58°WElev: 465ft.

Partly Cloudy

91°F

33°C

Humidity	49%
Wind Speed	W 9 mph
Barometer	30.02 in
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Heat Index	96°F (36°C)
Last update	30 Jul 12:35 pm EDT

More Information:

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

Extended Forecast for

Downingtown PA

Heat Advisory July 30, 01:14pm until July 30, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory July 30, 01:14pm until July 30, 08:00pm
NOW until 8:00pm Wed
Heat Advisory
This Afternoon
High: 96 °F
Sunny
Tonight
Low: 73 °F
Mostly Clear
Thursday
High: 87 °F
Chance
T-storms then
Heavy Rain
Thursday Night
Low: 66 °F
Heavy Rain
Friday
High: 71 °F
Showers
Likely
Friday Night
Low: 58 °F
Chance
T-storms then
Slight Chance
Showers
Saturday
High: 78 °F
Sunny
Saturday Night
Low: 58 °F
Mostly Clear

Detailed Forecast

This Afternoon

Sunny, with a high near 96. Heat index values as high as 101. Southwest wind around 5 mph.

Tonight

Mostly clear, with a low around 73. South wind around 5 mph becoming calm.

Thursday

A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. High near 87. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night

Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 66. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Friday

Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 71. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night

A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday

Sunny, with a high near 78.

Saturday Night

Mostly clear, with a low around 58.

Sunday

Sunny, with a high near 81.

Sunday Night

Mostly clear, with a low around 59.

Monday

Mostly sunny, with a high near 83.

Monday Night

Partly cloudy, with a low around 60.