Hourly Weather Forecast - Mercersburg, PA

12 AM
24°F
10%
7mph
WNW
Partly Cloudy
Humidity
52%
Feels like
16°F
Dew Point
9°F
1 AM
23°F
10%
6mph
WNW
Partly Cloudy
Humidity
53%
Feels like
16°F
Dew Point
9°F
2 AM
23°F
10%
6mph
WNW
Partly Cloudy
Humidity
54%
Feels like
16°F
Dew Point
9°F
3 AM
23°F
10%
5mph
WNW
Partly Cloudy
Humidity
54%
Feels like
16°F
Dew Point
9°F
4 AM
23°F
10%
5mph
WNW
Mostly Clear
Humidity
54%
Feels like
16°F
Dew Point
9°F
5 AM
22°F
10%
4mph
WNW
Mostly Clear
Humidity
55%
Feels like
17°F
Dew Point
9°F
6 AM
22°F
10%
4mph
E
Clear
Humidity
56%
Feels like
17°F
Dew Point
9°F
7 AM
23°F
10%
3mph
ESE
Clear
Humidity
55%
Feels like
19°F
Dew Point
9°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

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