Mercersburg, PA Weather Forecast
Local 7-day forecast
Chance Rain Showers then Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Mercersburg, PA in one place.
A chance of rain showers before 10am. Mostly cloudy, with a high near 62. Northeast wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
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: Sep 22, 2026 11:40 AM EDT.
The active forecast window currently covers Sep 23 to Sep 28, 2026 for Mercersburg, PA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 23 to Sep 28, 2026
- Latest sync
- Sep 22, 2026 11:40 AM EDT
- Forecast office
- CTP
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercersburg
Monday looks like the warmest upcoming period in Mercersburg at 73 degrees F.
Thursday Night is the coolest period ahead with temperatures near 47 degrees F.
The strongest winds are forecast for Friday Night at about 5 to 13 mph N.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 22, 2026 11:40 AM 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 49. Northeast wind 5 to 9 mph. New rainfall amounts less than a tenth of an inch possible.
Mostly sunny, with a high near 63. Northeast wind around 9 mph.
Partly cloudy, with a low around 47.
Sunny, with a high near 69.
Partly cloudy, with a low around 51.
Mostly sunny, with a high near 70.
Partly cloudy, with a low around 51.
Mostly sunny, with a high near 72.
Partly cloudy, with a low around 52.
Sunny, with a high near 73.
Partly cloudy, with a low around 53.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 23
|
Chance Rain Showers then Mostly Cloudy
|
62°F |
10 mph
NE
|
|
Wednesday Night
Sep 23
|
Mostly Cloudy
|
49°F |
5 to 9 mph
NE
|
|
Thursday
Sep 24
|
Mostly Sunny
|
63°F |
9 mph
NE
|
|
Thursday Night
Sep 24
|
Partly Cloudy
|
47°F |
2 to 7 mph
N
|
|
Friday
Sep 25
|
Sunny
|
69°F |
8 mph
N
|
|
Friday Night
Sep 25
|
Partly Cloudy
|
51°F |
5 to 13 mph
N
|
|
Saturday
Sep 26
|
Mostly Sunny
|
70°F |
9 to 13 mph
N
|
|
Saturday Night
Sep 26
|
Partly Cloudy
|
51°F |
12 mph
NW
|
|
Sunday
Sep 27
|
Mostly Sunny
|
72°F |
8 to 12 mph
NW
|
|
Sunday Night
Sep 27
|
Partly Cloudy
|
52°F |
7 mph
NW
|
|
Monday
Sep 28
|
Sunny
|
73°F |
6 mph
N
|
|
Monday Night
Sep 28
|
Partly Cloudy
|
53°F |
3 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mercersburg.
