Current Weather Forecast for Mercersburg

PA 17236  |   10:44am

Weather Conditions

68°

Feels Like 68°

Fair

57° 87°

4

UV Index

Good

Air Quality

SSW 4 mph

Wind

0 in

rain

Today

Thu 9/18

87°

Highest Temperature

2%

Some clouds this morning will give way to generally sunny skies for the afternoon. High 87F. Winds WNW at 5 to 10 mph.

Tonight

Thu 9/18

56°

Lowest Temperature

5%

Clear skies. Low 56F. Winds light and variable.

Tomorrow

Fri 9/19

88°

Highest Temperature

6%

Sunshine and some clouds. Very warm. High 88F. Winds NW at 5 to 10 mph.

Next 12 Hours Next 7 Days

Next 12 Hours Forecast in Mercersburg

Hourly Weather Forecast & Temperature

11AM

1%

70°

Feels Like 70°

Sunny

W 4 mph

Wind

1017 mb

Pressure

79%

Humidity

4

UV Index

10mi

Visibility

18%

Cloud Cover

12PM

1%

75°

Feels Like 75°

Sunny

W 5 mph

Wind

1017 mb

Pressure

65%

Humidity

6

UV Index

10mi

Visibility

10%

Cloud Cover

1PM

79°

Feels Like 81°

Sunny

WNW 5 mph

Wind

1016 mb

Pressure

53%

Humidity

7

UV Index

10mi

Visibility

11%

Cloud Cover

2PM

83°

Feels Like 84°

Sunny

NW 5 mph

Wind

1015 mb

Pressure

42%

Humidity

6

UV Index

10mi

Visibility

8%

Cloud Cover

3PM

85°

Feels Like 85°

Sunny

NW 6 mph

Wind

1015 mb

Pressure

36%

Humidity

5

UV Index

10mi

Visibility

1%

Cloud Cover

4PM

86°

Feels Like 86°

Sunny

NW 6 mph

Wind

1014 mb

Pressure

34%

Humidity

3

UV Index

10mi

Visibility

3%

Cloud Cover

5PM

85°

Feels Like 85°

Sunny

NW 7 mph

Wind

1014 mb

Pressure

35%

Humidity

1

UV Index

10mi

Visibility

4%

Cloud Cover

6PM

83°

Feels Like 83°

Sunny

NW 6 mph

Wind

1014 mb

Pressure

38%

Humidity

0

UV Index

10mi

Visibility

3%

Cloud Cover

7PM

80°

Feels Like 81°

Sunny

NW 5 mph

Wind

1015 mb

Pressure

43%

Humidity

0

UV Index

10mi

Visibility

1%

Cloud Cover

8PM

76°

Feels Like 76°

Clear

WNW 4 mph

Wind

1015 mb

Pressure

50%

Humidity

0

UV Index

10mi

Visibility

0%

Cloud Cover

9PM

1%

72°

Feels Like 72°

Clear

WNW 4 mph

Wind

1016 mb

Pressure

56%

Humidity

0

UV Index

10mi

Visibility

0%

Cloud Cover

10PM

1%

70°

Feels Like 70°

Clear

WNW 4 mph

Wind

1016 mb

Pressure

60%

Humidity

0

UV Index

10mi

Visibility

0%

Cloud Cover

Thu 9/18

Thu

2%

57°

87°

Partly cloudy. Highs in the upper 80s and lows in the mid 50s.

87°

Feels Like

WNW 7 mph

Wind

51%

Humidity

7

UV Index

6:55 AM

Sunrise

7:14 PM

Sunset

Fri 9/19

Fri

6%

56°

88°

Plenty of sun. Highs in the upper 80s and lows in the upper 50s.

88°

Feels Like

NW 6 mph

Wind

54%

Humidity

7

UV Index

6:56 AM

Sunrise

7:13 PM

Sunset

Sat 9/20

Sat

2%

58°

80°

Mix of sun and clouds. Highs in the low 80s and lows in the low 60s.

80°

Feels Like

ENE 7 mph

Wind

51%

Humidity

6

UV Index

6:57 AM

Sunrise

7:11 PM

Sunset

Sun 9/21

Sun

24%

61°

75°

Clouds giving way to sun . Highs in the mid 70s and lows in the low 60s.

75°

Feels Like

SE 9 mph

Wind

77%

Humidity

4

UV Index

6:58 AM

Sunrise

7:09 PM

Sunset

Mon 9/22

Mon

19%

61°

81°

Morning clouds followed by afternoon sun. Highs in the low 80s and lows in the low 60s.

82°

Feels Like

S 9 mph

Wind

70%

Humidity

6

UV Index

6:59 AM

Sunrise

7:08 PM

Sunset

Tue 9/23

Tue

24%

61°

85°

Partly cloudy. Highs in the mid 80s and lows in the low 60s.

86°

Feels Like

SW 7 mph

Wind

68%

Humidity

6

UV Index

7:00 AM

Sunrise

7:06 PM

Sunset

Wed 9/24

Wed

31%

63°

82°

Partly cloudy, chance of a thunderstorm. Highs in the low 80s and lows in the mid 60s.

83°

Feels Like

NE 6 mph

Wind

73%

Humidity

5

UV Index

7:01 AM

Sunrise

7:04 PM

Sunset

Thu 9/25

Thu

33%

64°

78°

Occasional showers possible. Highs in the upper 70s and lows in the mid 60s.

80°

Feels Like

E 7 mph

Wind

74%

Humidity

4

UV Index

7:02 AM

Sunrise

7:03 PM

Sunset

Need to see beyond 12 Hours?

Find more forecast on the FREE FOX WEATHER App

GO TO APP STORE

Latest Stories from Pennsylvania

Coastal flood threat, dangerous beach conditions linger across mid-Atlantic, Southeast and Florida

A flood threat to low-lying East Coast communities and dangerous beach conditions remain through Thursday, as a sprawling front that was parked for days just off the Eastern Seaboard will finally begin to move farther into the Atlantic Ocean as we head into the weekend.

Tornado rips across central Massachusetts as severe thunderstorms cause damage across Northeast

Powerful thunderstorms tore across parts of the Northeast and New England on Saturday, including reports of a tornado that caused damage in central Massachusetts.

Weekend weather update from FOX Weather: Hawaii declares state of emergency in preparation for Hurricane Kiko

Top weather news for Sept. 6, 2025. Hawaii's acting governor declared a statewide state of emergency as Hurricane Kiko continues to swirl toward the islands as a major hurricane.

Nashville faces intense storm threat as millions brace for severe weather

Intense storms caused damage in Tennessee on Thursday and the state is among several that faces a renewed severe weather threat Friday.

Load More Stories