Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Fair

76°F

24°C

Humidity	49%
Wind Speed	SE 3 mph
Barometer	30.01 in
Dewpoint	56°F (13°C)
Visibility	10.00 mi
Heat Index	78°F (26°C)
Last update	25 Jul 7:15 pm EDT

More Information:

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

Extended Forecast for

Downingtown PA

Tonight
Low: 58 °F
Mostly Clear
Sunday
High: 84 °F
Sunny
Sunday Night
Low: 62 °F
Partly Cloudy
then Chance
Showers
Monday
High: 82 °F
Mostly Sunny
then Showers
Likely
Monday Night
Low: 64 °F
Showers
Likely
Tuesday
High: 81 °F
Showers then
T-storms
Tuesday Night
Low: 64 °F
T-storms
Likely then
Showers
Likely
Wednesday
High: 80 °F
Chance
Showers then
Chance
T-storms
Wednesday Night
Low: 62 °F
Chance
T-storms then
Partly Cloudy

Detailed Forecast

Tonight

Mostly clear, with a low around 58. Southeast wind around 5 mph becoming calm.

Sunday

Sunny, with a high near 84. Calm wind becoming southeast around 5 mph.

Sunday Night

A chance of showers and thunderstorms, mainly between 3am and 4am. Partly cloudy, with a low around 62. South wind around 5 mph. Chance of precipitation is 30%.

Monday

Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 82. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Monday Night

Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 64. South wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday

Showers, with thunderstorms also possible after 11am. High near 81. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Tuesday Night

Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

Wednesday

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

Wednesday Night

A chance of thunderstorms before 8pm. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.

Thursday

Mostly sunny, with a high near 81.

Thursday Night

Mostly clear, with a low around 63.

Friday

Sunny, with a high near 84.

Friday Night

Partly cloudy, with a low around 65.