Weather in Upper St. Clair, PA
Upper St. Clair, Saturday, 8 August, 22:41
Mostly clear. Feels like 75°. High 84°, low 68°.
Monthly outlook for Upper St. Clair, PA: average high 79.3°, average low 60.8°. That is 0.1° below the climate normal for August. Precipitation is expected on 7 days (about 3.1 inches), against a normal of 7 days and 2.1 inches. The warmest day looks like 10 August (87.2°), the coolest 22 August (52.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 79.7° | 79.9° | -0.1° |
| 18 August – 27 August | 78.7° | 79.2° | -0.3° |
| 28 August – 6 September | at normal | 78.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Mount Lebanon (3 mi).
0.02
Upper St. Clair, Sunday, 9 August
Light rain. High 84°, low 69°.
1.95Upper St. Clair, Monday, 10 August
Heavy rain. High 87°, low 66°.
0.11Upper St. Clair, Tuesday, 11 August
Rain. High 81°, low 65°.
0.1Upper St. Clair, Wednesday, 12 August
Light rain. High 79°, low 66°.
0Upper St. Clair, Thursday, 13 August
Light rain. High 74°, low 60°.
0
Upper St. Clair, Friday, 14 August
Clear. High 77°, low 56°.
0
Upper St. Clair, Saturday, 15 August
Partly cloudy. High 77°, low 55°.
0Upper St. Clair, Sunday, 16 August
Partly cloudy. High 80°, low 56°.
0.03Upper St. Clair, Monday, 17 August
Light rain. High 74°, low 61°.
0Upper St. Clair, Tuesday, 18 August
Clear. High 82°, low 60°.
0.51Upper St. Clair, Wednesday, 19 August
Rain. High 84°, low 64°.
0.06Upper St. Clair, Thursday, 20 August
Light rain. High 68°, low 58°.
0Upper St. Clair, Friday, 21 August
Clear. High 75°, low 53°.
0.02Upper St. Clair, Saturday, 22 August
Light rain. High 77°, low 52°.
0.04Upper St. Clair, Sunday, 23 August
Light rain. High 85°, low 64°.
0.05Upper St. Clair, Monday, 24 August
Climate normal for this date — 60-year average.
0.09Upper St. Clair, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.09Upper St. Clair, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13
Upper St. Clair, Thursday, 27 August
Climate normal for this date — 60-year average.
0.19Upper St. Clair, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Upper St. Clair, Saturday, 29 August
Climate normal for this date — 60-year average.
0.14Upper St. Clair, Sunday, 30 August
Climate normal for this date — 60-year average.
0.16Upper St. Clair, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Upper St. Clair, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.13Upper St. Clair, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Upper St. Clair, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Upper St. Clair, Friday, 4 September
Climate normal for this date — 60-year average.
0.11Upper St. Clair, Saturday, 5 September
Climate normal for this date — 60-year average.
0.14Upper St. Clair, Sunday, 6 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 Upper St. Clair, 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 Upper St. Clair, 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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