Mercersburg, PA Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Mercersburg, PA in one place.
Mostly sunny, with a high near 81. East wind 1 to 5 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: Jul 23, 2026 12:49 PM EDT.
The active forecast window currently covers Jul 24 to Jul 29, 2026 for Mercersburg, PA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 24 to Jul 29, 2026
- Latest sync
- Jul 23, 2026 12:49 PM EDT
- Forecast office
- CTP
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercersburg
Monday looks like the warmest upcoming period in Mercersburg at 87 degrees F.
Friday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Tuesday at about 2 to 7 mph W.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 23, 2026 12:49 PM EDT
- Coverage
- 6 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
Mostly cloudy, with a low around 62. Southeast wind 0 to 3 mph.
Mostly sunny, with a high near 81. Southeast wind 0 to 5 mph.
A slight chance of rain showers after 2am. Partly cloudy, with a low around 63. Chance of precipitation is 20%.
A slight chance of rain showers before 8am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 8am, then showers and thunderstorms likely. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
A slight chance of rain showers before 8am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 83.
A slight chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 65.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 24
|
Mostly Sunny
|
81°F |
1 to 5 mph
E
|
|
Friday Night
Jul 24
|
Mostly Cloudy
|
62°F |
0 to 3 mph
SE
|
|
Saturday
Jul 25
|
Mostly Sunny
|
81°F |
0 to 5 mph
SE
|
|
Saturday Night
Jul 25
|
Partly Cloudy then Slight Chance Rain Showers
|
63°F |
0 to 3 mph
S
|
|
Sunday
Jul 26
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
84°F |
0 to 3 mph
S
|
|
Sunday Night
Jul 26
|
Chance Showers And Thunderstorms
|
65°F |
2 mph
W
|
|
Monday
Jul 27
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
87°F |
0 to 5 mph
NW
|
|
Monday Night
Jul 27
|
Chance Showers And Thunderstorms
|
68°F |
3 mph
W
|
|
Tuesday
Jul 28
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
86°F |
2 to 7 mph
W
|
|
Tuesday Night
Jul 28
|
Showers And Thunderstorms Likely
|
66°F |
6 mph
W
|
|
Wednesday
Jul 29
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
83°F |
3 to 7 mph
NW
|
|
Wednesday Night
Jul 29
|
Slight Chance Showers And Thunderstorms
|
65°F |
6 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mercersburg.
