News Headlines
- When does the first frost occur in Central PA? See when the first 36 degree temperatures typically occur.
- A 5th tornado has been determined to have occurred in Central PA (Burnside Twp in northern Centre County) on July 18th, 2026. See details.
- See information on the Cyclone (PA) Tornado of Sept 9th, 2026
- See information on 3 Tornadoes that occurred on September 1st, 2026
Current conditions at
Hagerstown, Washington County Regional Airport (KHGR)
Lat: 39.71°NLon: 77.73°WElev: 702ft.
Overcast
62°F
17°C
| Humidity | 93% |
| Wind Speed | N 7 mph |
| Barometer | 30.08 in (1019.2 mb) |
| Dewpoint | 60°F (16°C) |
| Visibility | 10.00 mi |
| Last update | 21 Sep 7:53 pm EDT |
Extended Forecast for
3 Miles S Mercersburg PA
Tonight
Low: 54 °F
Showers
Tuesday
High: 61 °F
Showers
Tuesday Night
Low: 51 °F
Showers
LikelyWednesday
High: 62 °F
Showers
LikelyWednesday Night
Low: 50 °F
Slight Chance
ShowersThursday
High: 63 °F
Partly Sunny
Thursday Night
Low: 47 °F
Partly Cloudy
Friday
High: 68 °F
Sunny
Friday Night
Low: 49 °F
Partly Cloudy
Detailed Forecast
Tonight
Showers, mainly after 10pm. Low around 54. Northeast wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday
Showers. High near 61. Northeast wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers likely. Cloudy, with a low around 51. Northeast wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 62. Northeast wind around 9 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A slight chance of showers before 2am. Mostly cloudy, with a low around 50. Northeast wind 6 to 8 mph. Chance of precipitation is 20%.
Thursday
Partly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 51.
Monday
Mostly sunny, with a high near 73.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
3 Miles S Mercersburg PA
39.8°N 77.91°W (Elev. 600 ft)
39.8°N 77.91°W (Elev. 600 ft)
8:06 pm EDT Sep 21, 2026
8pm EDT Sep 21, 2026-6pm EDT Sep 28, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
