Weather in South Mountain, PA
South Mountain, Sunday, 9 August, 02:02
Overcast. Feels like 69°. High 81°, low 68°.
Monthly outlook for South Mountain, PA: average high 79.4°, average low 60.2°. That is 1.5° below the climate normal for August. Precipitation is expected on 5 days (about 1.1 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 10 August (89.6°), the coolest 22 August (51.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 79° | 82.8° | -2.1° |
| 19 August – 28 August | 80° | 81.6° | -0.8° |
| 29 August – 7 September | at normal | 80.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Rouzerville (8 mi).
0.22
South Mountain, Monday, 10 August
Rain. High 90°, low 65°.
0.44South Mountain, Tuesday, 11 August
Heavy rain. High 82°, low 63°.
0South Mountain, Wednesday, 12 August
Overcast. High 86°, low 65°.
0South Mountain, Thursday, 13 August
Light rain. High 78°, low 60°.
0
South Mountain, Friday, 14 August
Partly cloudy. High 76°, low 54°.
0
South Mountain, Saturday, 15 August
Clear. High 77°, low 55°.
0South Mountain, Sunday, 16 August
Overcast. High 79°, low 55°.
0.09South Mountain, Monday, 17 August
Light rain. High 73°, low 63°.
0South Mountain, Tuesday, 18 August
Overcast. High 69°, low 62°.
0.1South Mountain, Wednesday, 19 August
Light rain. High 84°, low 63°.
0.23South Mountain, Thursday, 20 August
Rain. High 72°, low 61°.
0South Mountain, Friday, 21 August
Clear. High 76°, low 53°.
0South Mountain, Saturday, 22 August
Partly cloudy. High 79°, low 52°.
0.01South Mountain, Sunday, 23 August
Light rain. High 85°, low 62°.
0South Mountain, Monday, 24 August
Clear. High 85°, low 66°.
0.05
South Mountain, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.05South Mountain, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.15
South Mountain, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13South Mountain, Friday, 28 August
Climate normal for this date — 60-year average.
0.07South Mountain, Saturday, 29 August
Climate normal for this date — 60-year average.
0.05South Mountain, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09South Mountain, Monday, 31 August
Climate normal for this date — 60-year average.
0.12South Mountain, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09South Mountain, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.06South Mountain, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1South Mountain, Friday, 4 September
Climate normal for this date — 60-year average.
0.08South Mountain, Saturday, 5 September
Climate normal for this date — 60-year average.
0.22South Mountain, Sunday, 6 September
Climate normal for this date — 60-year average.
0.12South Mountain, Monday, 7 September
Climate normal for this date — 60-year average.
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 South Mountain, 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 South Mountain, 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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