Hourly Weather Forecast - Mercersburg, PA

12 AM
28°F
0%
5mph
WNW
Partly Cloudy
Humidity
70%
Feels like
22°F
Dew Point
19°F
1 AM
27°F
0%
5mph
WNW
Partly Cloudy
Humidity
70%
Feels like
21°F
Dew Point
18°F
2 AM
26°F
0%
5mph
WNW
Partly Cloudy
Humidity
70%
Feels like
20°F
Dew Point
17°F
3 AM
25°F
0%
5mph
WNW
Partly Cloudy
Humidity
70%
Feels like
19°F
Dew Point
17°F
4 AM
24°F
0%
5mph
WNW
Partly Cloudy
Humidity
70%
Feels like
18°F
Dew Point
16°F
5 AM
24°F
0%
5mph
WNW
Mostly Clear
Humidity
70%
Feels like
17°F
Dew Point
15°F
6 AM
23°F
0%
4mph
WNW
Mostly Clear
Humidity
70%
Feels like
17°F
Dew Point
15°F
7 AM
23°F
0%
4mph
WNW
Mostly Clear
Humidity
68%
Feels like
18°F
Dew Point
14°F
7:33 AM
8 AM
25°F
0%
4mph
WNW
Partly Cloudy
Humidity
63%
Feels like
19°F
Dew Point
14°F
9 AM
27°F
0%
5mph
WNW
Mostly Cloudy
Humidity
58%
Feels like
22°F
Dew Point
14°F
10 AM
29°F
0%
5mph
WNW
Cloudy
Humidity
53%
Feels like
24°F
Dew Point
15°F
11 AM
31°F
10%
5mph
WNW
Cloudy
Humidity
49%
Feels like
26°F
Dew Point
14°F
12 PM
33°F
10%
5mph
WNW
Cloudy
Humidity
46%
Feels like
28°F
Dew Point
14°F
1 PM
34°F
10%
4mph
WNW
Cloudy
Humidity
43%
Feels like
30°F
Dew Point
14°F
2 PM
34°F
10%
4mph
WNW
Cloudy
Humidity
41%
Feels like
30°F
Dew Point
13°F
3 PM
34°F
10%
4mph
WNW
Cloudy
Humidity
41%
Feels like
30°F
Dew Point
13°F
4 PM
33°F
10%
4mph
NW
Mostly Cloudy
Humidity
42%
Feels like
30°F
Dew Point
13°F
4:59 PM
5 PM
32°F
10%
3mph
NW
Partly Cloudy
Humidity
45%
Feels like
32°F
Dew Point
13°F
6 PM
30°F
10%
2mph
NW
Mostly Clear
Humidity
49%
Feels like
30°F
Dew Point
13°F
7 PM
28°F
10%
2mph
NW
Clear
Humidity
52%
Feels like
28°F
Dew Point
13°F
8 PM
27°F
10%
2mph
NNW
Clear
Humidity
55%
Feels like
27°F
Dew Point
13°F
9 PM
26°F
10%
2mph
NNW
Clear
Humidity
58%
Feels like
26°F
Dew Point
13°F
10 PM
26°F
10%
2mph
NNW
Clear
Humidity
60%
Feels like
26°F
Dew Point
14°F
11 PM
25°F
10%
1mph
NNW
Clear
Humidity
61%
Feels like
25°F
Dew Point
14°F

Wednesday's Weather Outlook

Wednesday's Weather Outlook

After an overall quieter day of weather on Tuesday, Mother Nature brings a soggy, snowy forecast.

St. Louis Tornado - May 16th, 2025

2025 Year in Review: Billion-Dollar Disasters From May through June

EF3 tornado damage near Plantersville, Alabama

2025 Year in Review: Billion-Dollar Disasters From February Through April

Photos and videos from the Palisades Fire that started in the City of Los Angeles, January 8, 2025. (CAL FIRE_Official via Wikimedia Commons)

2025 Year in Review: Billion Dollar Disasters - The California Wildfires

Large wall of dust approaching Phoenix Sky Harbor Airport at around 5:30 PM MST (Photo credit: Mike Olbinski via NWS)

2025 Year in Review: Extreme Weather - July Through December

A frame from an automated video of a tornado and its mesocyclone that derailed multiple train cars near Enderlin, North Dakota and destroyed multiple homes on June 20, 2025. (ChrisWx via Wikimedia Commons)

2025 Year in Review: Extreme Weather - January through June

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide