Weather in Mercersburg, PA
Mercersburg, Sunday, 9 August, 05:38
Partly cloudy. Feels like 73°. High 88°, low 71°.
0.03
Mercersburg, Monday, 10 August
Light rain. High 89°, low 71°.
0.37Mercersburg, Tuesday, 11 August
Rain. High 91°, low 67°.
0.04Mercersburg, Wednesday, 12 August
Light rain. High 87°, low 66°.
0.17Mercersburg, Thursday, 13 August
Rain. High 84°, low 66°.
0
Mercersburg, Friday, 14 August
Overcast. High 79°, low 56°.
0Mercersburg, Saturday, 15 August
Overcast. High 78°, low 54°.
0Mercersburg, Sunday, 16 August
Overcast. High 75°, low 53°.
0
Mercersburg, Monday, 17 August
Mostly clear. High 84°, low 59°.
0Mercersburg, Tuesday, 18 August
Mostly clear. High 88°, low 62°.
0
Mercersburg, Wednesday, 19 August
Partly cloudy. High 89°, low 62°.
0Mercersburg, Thursday, 20 August
Partly cloudy. High 94°, low 65°.
0.1Mercersburg, Friday, 21 August
Light rain. High 98°, low 68°.
0Mercersburg, Saturday, 22 August
Partly cloudy. High 98°, low 74°.
0.03Mercersburg, Sunday, 23 August
Light rain. High 102°, low 70°.
0.41Mercersburg, Monday, 24 August
Rain. High 100°, low 72°.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Mercersburg, PA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Mercersburg, PA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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