Hourly Weather Forecast - Mercersburg, PA

12 AM
54°F
40%
5mph
W
40% Chance of Light Rain
Humidity
77%
Feels like
54°F
Dew Point
47°F
1 AM
53°F
40%
5mph
W
40% Chance of Light Rain
Humidity
78%
Feels like
53°F
Dew Point
46°F
2 AM
52°F
40%
4mph
W
40% Chance of Light Rain
Humidity
80%
Feels like
52°F
Dew Point
46°F
3 AM
51°F
50%
4mph
W
50% Chance of Light Rain
Humidity
82%
Feels like
51°F
Dew Point
46°F
4 AM
50°F
50%
5mph
WNW
50% Chance of Light Rain
Humidity
84%
Feels like
48°F
Dew Point
45°F
5 AM
49°F
50%
5mph
WNW
50% Chance of Light Rain
Humidity
86%
Feels like
47°F
Dew Point
45°F
6 AM
48°F
50%
6mph
NW
50% Chance of Light Rain
Humidity
88%
Feels like
45°F
Dew Point
44°F
7 AM
47°F
50%
6mph
NW
50% Chance of Light Rain
Humidity
88%
Feels like
45°F
Dew Point
44°F
7:04 AM
8 AM
48°F
50%
6mph
NW
50% Chance of Light Rain
Humidity
85%
Feels like
45°F
Dew Point
44°F
9 AM
49°F
40%
6mph
NNW
40% Chance of Light Rain
Humidity
80%
Feels like
46°F
Dew Point
43°F
10 AM
49°F
40%
7mph
NNW
40% Chance of Light Rain
Humidity
76%
Feels like
46°F
Dew Point
42°F
11 AM
50°F
30%
7mph
NNW
30% Chance of Light Rain
Humidity
71%
Feels like
47°F
Dew Point
41°F
12 PM
50°F
30%
7mph
NNW
30% Chance of Light Rain
Humidity
67%
Feels like
47°F
Dew Point
39°F
1 PM
49°F
30%
8mph
NNW
30% Chance of Light Rain
Humidity
64%
Feels like
46°F
Dew Point
38°F
2 PM
49°F
30%
8mph
NNW
30% Chance of Light Rain
Humidity
61%
Feels like
46°F
Dew Point
37°F
3 PM
50°F
30%
8mph
NNW
30% Chance of Light Rain
Humidity
57%
Feels like
46°F
Dew Point
35°F

Today's High Temperature Outlook

Early Spring Heat Wave Zaps Southwest

Much of the Southwest will observe record-breaking heat through the weekend, with high temperatures reminiscent of mid-summer!

Weekend Weather Outlook

Weekend Weather Outlook

Weekly Drought Map for March 19, 2026

Active Weather, Drought Improvements for Eastern Half; Drying Persists Elsewhere

(Image provided by Pixabay.com)

Lightning Safety

A tree knocked over after a storm produced high winds. (provided by PublicDomainPictures via Pixabay.com)

Strong Winds in the Springtime

Story image: WeatherBug user Pat S. captures a plant blooming in Columbia, Md., on February 24, 2017.

When Does Spring Begin?

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