Point Forecast: 3 Miles NW Mercersburg PA
 39.87N 77.95W (Elev. 997 ft)
Last Update: 6:13 pm EDT Jul 15, 2025
Tabular Forecast
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Weather ElementsFire WeatherAviation Weather
Temperature (°F)
Dewpoint (°F)
Heat Index (°F)

Surface Wind  
Sky Cover (%)
Precipitation Potential (%)
Relative Humidity (%)

Rain
Thunder
Fog
Mixing Height  
Trans. Wind  
20ft Wind  
Vent Rate (x1000 mph-ft)
Davis Stability Index
Atmospheric Dispersion Index
Low Visibility Occurrence Risk Index
Ceiling Height
Visibility
Thunder Potential

48-Hour Period Starting:       Back 2 Days  

Date07/16
Hour (EDT)000102030405060708091011121314151617181920212223
Temperature (°F)737372717170707073767980828383838080797877747373
Dewpoint (°F)717069706969697072747574757675757474737373727171
Heat Index (°F)767985899190908585797877
Surface Wind (mph)111112222223335553332222
Wind DirSESSESESESEESESESSSSSSESSWSSSSSSS
Gust
Sky Cover (%)534945506164747575666963756369888881697778636975
Precipitation Potential (%)443443332236162854816847494745454545
Relative Humidity (%)9390909793979710097948882798077778282828588939393
Rain------------------------SChcChcChcOcnlLklyChcChcChcChcChcChcChc
Thunder------------------------SChcChcChcLklyLklyChcChcChcChcChcChcChc

Date07/17
Hour (EDT)000102030405060708091011121314151617181920212223
Temperature (°F)737272717171717274767982848586878786858482807876
Dewpoint (°F)717070696969707172737475757474747474737372727171
Heat Index (°F)767989929394959594929087847876
Surface Wind (mph)233333355566677777665555
Wind DirSSWSWSWSWSWSWSWSWSWWWWWWWWWWWWWWW
Gust
Sky Cover (%)716662646769605142403937445057575757585960605959
Precipitation Potential (%)454516161616161616161616161635353535353521212121
Relative Humidity (%)939393939393979793908579747068656568677072777985
RainChcChcSChcSChcSChcSChcSChcSChcSChcSChcSChcSChcSChcSChcChcChcChcChcChcChcSChcSChcSChcSChc
ThunderChcChc------------------SChcSChcSChcChcChcChcChcChcChcSChcSChcSChc--

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