National Weather Service United States Department of Commerce

Heavy rain and flash flooding possible in the Desert Southwest and Great Lake States this evening and tonight

A slow moving cold front may bring heavy rain and localized flooding Wednesday to portions of the Great Plains. More heavy rain will be possible in the Desert Southwest again Wednesday. Hot temperatures will continue in the Mississippi Valley - and spread up the east coast Wednesday.
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Hazardous Weather Conditions

Current Conditions

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3 Miles NW Mercersburg PA

7 Day Forecast

For More Weather Information:

State College, PA Local Forecast Office

Today

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 88 °F

Tonight

Scattered Thunderstorms Chance for Measurable Precipitation 30%

Scattered
Thunderstorms

Low: 60 °F

Thursday

Sunny

Sunny

High: 79 °F

Thursday
Night

Mostly Clear

Mostly
Clear

Low: 56 °F

Friday

Mostly Sunny

Mostly
Sunny

High: 80 °F

Friday
Night

Partly Cloudy

Partly
Cloudy

Low: 61 °F

Saturday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 86 °F

Saturday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 65 °F

Sunday

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

High: 87 °F

Detailed Forecast

  • Today A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
  • Tonight Scattered showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 60. Northwest wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
  • Thursday Sunny, with a high near 79. Northwest wind 6 to 8 mph.
  • Thursday Night Mostly clear, with a low around 56. Northwest wind 3 to 6 mph.
  • Friday Mostly sunny, with a high near 80. Calm wind becoming south around 6 mph in the afternoon.
  • Friday Night Partly cloudy, with a low around 61.
  • Saturday A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 30%.
  • Saturday Night Mostly cloudy, with a low around 65.
  • Sunday A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 40%.
  • Sunday Night A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
  • Labor Day A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Chance of precipitation is 30%.
  • Monday Night Mostly cloudy, with a low around 64.
  • Tuesday A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 30%.