Mercersburg, PA Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Mercersburg, PA in one place.
Partly sunny, with a high near 82. Southeast wind around 7 mph.
Local Weather Overview
This forecast page for Mercersburg, PA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jun 8, 2026 5:29 PM EDT.
The active forecast window currently covers Jun 8 to Jun 14, 2026 for Mercersburg, PA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 8 to Jun 14, 2026
- Latest sync
- Jun 8, 2026 5:29 PM EDT
- Forecast office
- CTP
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercersburg
Thursday looks like the warmest upcoming period in Mercersburg at 94 degrees F.
Tonight is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Tuesday at about 3 to 9 mph S.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 8, 2026 5:29 PM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- CTP
- Radar station
- KLWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 59. Southeast wind 3 to 7 mph.
Partly sunny, with a high near 84. South wind 3 to 9 mph.
Showers and thunderstorms likely after 2am. Mostly cloudy, with a low around 67. South wind 3 to 8 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms likely. Partly sunny, with a high near 90. Southwest wind 3 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Showers and thunderstorms likely before 8pm. Partly cloudy, with a low around 69. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Showers and thunderstorms likely after 2pm. Partly sunny, with a high near 94. Chance of precipitation is 60%.
Showers and thunderstorms likely before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Mostly sunny, with a high near 88.
Mostly clear, with a low around 65.
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jun 8
|
Partly Sunny
|
82°F |
7 mph
SE
|
|
Tonight
Jun 8
|
Partly Cloudy
|
59°F |
3 to 7 mph
SE
|
|
Tuesday
Jun 9
|
Partly Sunny
|
84°F |
3 to 9 mph
S
|
|
Tuesday Night
Jun 9
|
Mostly Cloudy then Showers And Thunderstorms Likely
|
67°F |
3 to 8 mph
S
|
|
Wednesday
Jun 10
|
Showers And Thunderstorms Likely
|
90°F |
3 to 8 mph
SW
|
|
Wednesday Night
Jun 10
|
Showers And Thunderstorms Likely then Partly Cloudy
|
69°F |
2 to 7 mph
W
|
|
Thursday
Jun 11
|
Mostly Sunny then Chance Showers And Thunderstorms
|
94°F |
2 to 8 mph
W
|
|
Thursday Night
Jun 11
|
Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
1 to 7 mph
W
|
|
Friday
Jun 12
|
Partly Sunny then Showers And Thunderstorms Likely
|
94°F |
1 to 7 mph
W
|
|
Friday Night
Jun 12
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
66°F |
2 to 7 mph
W
|
|
Saturday
Jun 13
|
Mostly Sunny
|
88°F |
6 mph
NW
|
|
Saturday Night
Jun 13
|
Mostly Clear
|
65°F |
0 to 6 mph
NW
|
|
Sunday
Jun 14
|
Mostly Sunny then Chance Showers And Thunderstorms
|
91°F |
0 to 7 mph
W
|
|
Sunday Night
Jun 14
|
Chance Showers And Thunderstorms
|
65°F |
1 to 6 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mercersburg.
