Weather forecast for tomorrow
Mercersburg, PA

Weather forecast for tomorrow

Wednesday, Jun 18.

AM Showers
5:41 am

8:44 pm
EDT
AM Showers
86°F / 72°F
  • Wind: 8mph WSW
  • Humidity: 78%
  • Precip. probability: 44%
  • Precipitation: 0.08"
  • UV index: 7
On Wednesday, June 18, early morning showers may leave roads damp before clearing later.
Minimal precipitation is predicted for tomorrow. The temperature is forecasted to vary between a tropical 86°F and a pleasant 71.6°F.
The maximum heat index, which combines air temperature and relative humidity, is calculated to be a sizzling 98.6°F. Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
The temperature of 86°F reflects July's climate better than June's.
Sunrise will be at 5:41 am and sunset at 8:44 pm; tomorrow's daylight will last for 15h and 3min.

Frequently asked questions

What is the weather forecast for Mercersburg for tomorrow?
On Wednesday, in Mercersburg, expect a damp start with early morning showers.
Will it rain tomorrow in Mercersburg?
Tomorrow, there is a low probability of minimal rainfall in Mercersburg.
What will be the highest temperature tomorrow?
Tomorrow, the maximum temperature will be 86°F, while the minimum temperature will be 71.6°F. The maximum heat index, which measures the combined effect of heat and moisture, is estimated at 98.6°F.
The highest temperature will be relatively higher than the average maximum of 79.5°F in June. The lowest temperature will be uncommonly higher than the average low of 57.9°F.
What time are sunrise and sunset tomorrow?
On Wednesday, in Mercersburg, sunrise will be at 5:41 am and sunset at 8:44 pm (EDT).
How many hours of daylight will Mercersburg have tomorrow?
In Mercersburg, tomorrow, there will be 15h and 3min of daylight.

Hourly weather forecast

12 am
  • 72°F
  • Feels like:
    75°F
Cloudy
Cloudy
  • Wind: 2mph S
  • Pressure: 29.91"Hg
  • Humidity: 94%
  • Precip. probability: 23%
  • Precipitation: 0"
  • Visibility: 4mi
2 am
  • 72°F
  • Feels like:
    73°F
Cloudy
Cloudy
  • Wind: 2mph SSW
  • Pressure: 29.91"Hg
  • Humidity: 94%
  • Precip. probability: 19%
  • Precipitation: 0"
  • Visibility: 4mi
4 am
  • 72°F
  • Feels like:
    73°F
Few Showers
Few Showers
  • Wind: 1mph S
  • Pressure: 29.88"Hg
  • Humidity: 93%
  • Precip. probability: 33%
  • Precipitation: 0.04"
  • Visibility: 1mi
Sunrise: 5:41 am
6 am
  • 72°F
  • Feels like:
    73°F
Cloudy
Cloudy
  • Wind: 1mph SSW
  • Pressure: 29.88"Hg
  • Humidity: 95%
  • Precip. probability: 23%
  • Precipitation: 0"
  • Visibility: 1mi
8 am
  • 73°F
  • Feels like:
    75°F
Showers
Showers
  • Wind: 2mph SW
  • Pressure: 29.91"Hg
  • Humidity: 95%
  • Precip. probability: 44%
  • Precipitation: 0.04"
  • Visibility: 2mi
10 am
  • 77°F
  • Feels like:
    81°F
Showers
Showers
  • Wind: 4mph SW
  • Pressure: 29.91"Hg
  • Humidity: 85%
  • Precip. probability: 41%
  • Precipitation: 0.04"
  • Visibility: 7mi
12 pm
  • 79°F
  • Feels like:
    84°F
Mostly Cloudy
Mostly Cloudy
  • Wind: 6mph WSW
  • Pressure: 29.91"Hg
  • Humidity: 77%
  • Precip. probability: 21%
  • Precipitation: 0"
  • Visibility: 10mi
2 pm
  • 82°F
  • Feels like:
    88°F
Cloudy
Cloudy
  • Wind: 8mph WSW
  • Pressure: 29.88"Hg
  • Humidity: 70%
  • Precip. probability: 16%
  • Precipitation: 0"
  • Visibility: 10mi
4 pm
  • 84°F
  • Feels like:
    90°F
Partly Cloudy
Partly Cloudy
  • Wind: 8mph WSW
  • Pressure: 29.85"Hg
  • Humidity: 67%
  • Precip. probability: 15%
  • Precipitation: 0"
  • Visibility: 10mi
6 pm
  • 84°F
  • Feels like:
    91°F
Few Showers
Few Showers
  • Wind: 7mph WSW
  • Pressure: 29.85"Hg
  • Humidity: 64%
  • Precip. probability: 34%
  • Precipitation: 0.04"
  • Visibility: 10mi
8 pm
  • 82°F
  • Feels like:
    88°F
Sunny
Sunny
  • Wind: 5mph SW
  • Pressure: 29.85"Hg
  • Humidity: 70%
  • Precip. probability: 5%
  • Precipitation: 0"
  • Visibility: 10mi
Sunset: 8:44 pm
10 pm
  • 79°F
  • Feels like:
    82°F
Clear
Clear
  • Wind: 4mph SW
  • Pressure: 29.88"Hg
  • Humidity: 78%
  • Precip. probability: 6%
  • Precipitation: 0"
  • Visibility: 10mi
Tomorrow, on Wednesday, weather will be unstable, and a mix of cloudy, rain-soaked, stormy and sun-filled weather is expected.
With minimal precipitation of 0.04", rainfall is anticipated at 4 am, 7 am, 8 am, 10 am, 11 am and 6 pm.
The temperature will vary between a minimum of 71.6°F and a maximum of 84.2°F. The feels-like temperature will be between the lowest temperature of 73.4°F and the highest temperature of 91.4°F. The hottest part of the day will be from 3 pm to 7 pm.
The maximum temperature will be more comparable to July's average high of 84.7°F than June's 79.5°F. The lowest temperature is also more close to July's average minimum of 62.6°F than the usual minimum of 57.9°F in June.
Updated: Jun 17, 2025 @ 19:49:16 UTC
Published by: Weather U.S. | About Us
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Weather Forecasting & Climate
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