Hourly Weather Forecast - Mercersburg, PA

9 AM
24°F
0%
11mph
NW
Partly Cloudy
Humidity
59%
Feels like
13°F
Dew Point
12°F
10 AM
23°F
0%
13mph
NW
Partly Cloudy
Humidity
55%
Feels like
12°F
Dew Point
10°F
11 AM
23°F
0%
13mph
NW
Partly Cloudy
Humidity
53%
Feels like
11°F
Dew Point
8°F
12 PM
22°F
0%
13mph
NW
Partly Cloudy
Humidity
51%
Feels like
9°F
Dew Point
7°F
1 PM
21°F
0%
14mph
WNW
Partly Cloudy
Humidity
49%
Feels like
8°F
Dew Point
5°F
2 PM
20°F
0%
14mph
WNW
Mostly Cloudy
Humidity
48%
Feels like
7°F
Dew Point
4°F
3 PM
20°F
0%
14mph
WNW
Partly Cloudy
Humidity
48%
Feels like
6°F
Dew Point
3°F
4 PM
19°F
0%
14mph
WNW
Partly Cloudy
Humidity
49%
Feels like
6°F
Dew Point
3°F
4:47 PM
5 PM
18°F
0%
13mph
WNW
Mostly Clear
Humidity
52%
Feels like
5°F
Dew Point
4°F
6 PM
18°F
0%
13mph
WNW
Mostly Clear
Humidity
55%
Feels like
4°F
Dew Point
4°F
7 PM
17°F
0%
13mph
WNW
Mostly Clear
Humidity
58%
Feels like
4°F
Dew Point
5°F
8 PM
17°F
0%
13mph
WNW
Mostly Clear
Humidity
60%
Feels like
4°F
Dew Point
6°F
9 PM
17°F
0%
12mph
NW
Partly Cloudy
Humidity
61%
Feels like
4°F
Dew Point
6°F
10 PM
17°F
0%
11mph
NW
Partly Cloudy
Humidity
61%
Feels like
5°F
Dew Point
6°F
11 PM
17°F
0%
11mph
NW
Mostly Clear
Humidity
61%
Feels like
5°F
Dew Point
6°F

Wind chill temperatures Monday A.M.

Cold Weather Chills the Nation Down to the Gulf

Extreme cold paired with their wind chill values will shiver much of the nation.

Snowfall forecast through Monday evening.

Mid-Atlantic, Great Lakes Snow Piles Up

Sunday Weather Outlook

Today's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide