Weather in Upper Allen, PA
Upper Allen, Sunday, 9 August, 03:21
Clear. Feels like 73°. High 86°, low 71°.
Monthly outlook for Upper Allen, PA: average high 86.5°, average low 64.9°. That is 2.5° above the climate normal for August. Precipitation is expected on 4 days (about 1.8 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 21 August (100.6°), the coolest 16 August (54.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 82.8° | 82.8° | -0° |
| 19 August – 28 August | 92.8° | 81.6° | +6.2° |
| 29 August – 7 September | at normal | 80.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Messiah College (2 mi).
0.03
Upper Allen, Monday, 10 August
Light rain. High 86°, low 69°.
0.52Upper Allen, Tuesday, 11 August
Heavy rain. High 88°, low 67°.
0.02Upper Allen, Wednesday, 12 August
Light rain. High 87°, low 68°.
0.24Upper Allen, Thursday, 13 August
Rain. High 82°, low 65°.
0
Upper Allen, Friday, 14 August
Partly cloudy. High 78°, low 58°.
0
Upper Allen, Saturday, 15 August
Mostly clear. High 78°, low 55°.
0
Upper Allen, Sunday, 16 August
Overcast. High 78°, low 54°.
0Upper Allen, Monday, 17 August
Overcast. High 79°, low 58°.
0Upper Allen, Tuesday, 18 August
Partly cloudy. High 85°, low 61°.
0Upper Allen, Wednesday, 19 August
Mostly clear. High 87°, low 63°.
0Upper Allen, Thursday, 20 August
Overcast. High 92°, low 64°.
0.46Upper Allen, Friday, 21 August
Rain. High 101°, low 70°.
0Upper Allen, Saturday, 22 August
Mostly clear. High 93°, low 73°.
0
Upper Allen, Sunday, 23 August
Clear. High 100°, low 68°.
0.56Upper Allen, Monday, 24 August
Rain. High 84°, low 71°.
0.05Upper Allen, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.05Upper Allen, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.15
Upper Allen, Thursday, 27 August
Climate normal for this date — 60-year average.
0.17Upper Allen, Friday, 28 August
Climate normal for this date — 60-year average.
0.09Upper Allen, Saturday, 29 August
Climate normal for this date — 60-year average.
0.06Upper Allen, Sunday, 30 August
Climate normal for this date — 60-year average.
0.08Upper Allen, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Upper Allen, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.12Upper Allen, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.06Upper Allen, Thursday, 3 September
Climate normal for this date — 60-year average.
0.11Upper Allen, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Upper Allen, Saturday, 5 September
Climate normal for this date — 60-year average.
0.18Upper Allen, Sunday, 6 September
Climate normal for this date — 60-year average.
0.11Upper Allen, 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 Upper Allen, 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 Allen, 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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