Allentown weather in August: Allentown, Pennsylvania: normal highs, lows, rain and records for August
Allentown in August has a normal high of 84°F and a normal low of 63°F, a daily mean of 74°F, falling from 86°F on the 1st to 82°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 4.56 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 17°C, 116 mm of precipitation in August.
- NOAA stationAllentown Lehigh Valley International Airport
- Station IDUSW00014737
- Location40.65°N 75.45°W
- Elevation390 ft (119 m)
- From the center4 miles
- Population127,138
- Jan 38° 22°
- Feb 42° 23°
- Mar 51° 31°
- Apr 63° 40°
- May 74° 51°
- Jun 82° 60°
- Jul 86° 65°
- Aug 84° 63°
- Sep 77° 55°
- Oct 66° 44°
- Nov 54° 34°
- Dec 43° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Allentown in August?
The normal high is 84°F and the normal low 63°F, for a daily mean of 73.6°F. August is 2.0°F cooler than July and 7.3°F warmer than September. August is the 2nd warmest month of the year in Allentown and the 3rd wettest. Across the month the normal high falls 4°F, from 86°F on August 1 to 82°F on August 31. From one year to the next August's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 72°F and 76°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 86°F | 65°F | 35% | 25% |
| August 8 | 85°F | 64°F | 34% | 25% |
| August 15 | 85°F | 63°F | 33% | 24% |
| August 22 | 84°F | 62°F | 32% | 22% |
| August 31 | 82°F | 60°F | 31% | 21% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 86°F | 65°F | 35% | 25% | 14 h 20 min |
| August 2 | 86°F | 65°F | 34% | 25% | 14 h 20 min |
| August 3 | 86°F | 64°F | 34% | 25% | 14 h 20 min |
| August 4 | 86°F | 64°F | 34% | 25% | 14 h 10 min |
| August 5 | 85°F | 64°F | 34% | 25% | 14 h 10 min |
| August 6 | 85°F | 64°F | 34% | 25% | 14 h 10 min |
| August 7 | 85°F | 64°F | 34% | 25% | 14 h 10 min |
| August 8 | 85°F | 64°F | 34% | 25% | 14 h 10 min |
| August 9 | 85°F | 64°F | 34% | 25% | 14 h |
| August 10 | 85°F | 64°F | 34% | 25% | 14 h |
| August 11 | 85°F | 64°F | 34% | 24% | 14 h |
| August 12 | 85°F | 64°F | 34% | 24% | 14 h |
| August 13 | 85°F | 63°F | 34% | 24% | 14 h |
| August 14 | 85°F | 63°F | 34% | 24% | 13 h 50 min |
| August 15 | 85°F | 63°F | 33% | 24% | 13 h 50 min |
| August 16 | 85°F | 63°F | 33% | 24% | 13 h 50 min |
| August 17 | 84°F | 63°F | 33% | 23% | 13 h 50 min |
| August 18 | 84°F | 63°F | 33% | 23% | 13 h 40 min |
| August 19 | 84°F | 63°F | 33% | 23% | 13 h 40 min |
| August 20 | 84°F | 62°F | 32% | 23% | 13 h 40 min |
| August 21 | 84°F | 62°F | 32% | 22% | 13 h 40 min |
| August 22 | 84°F | 62°F | 32% | 22% | 13 h 30 min |
| August 23 | 84°F | 62°F | 32% | 22% | 13 h 30 min |
| August 24 | 84°F | 62°F | 32% | 22% | 13 h 30 min |
| August 25 | 83°F | 62°F | 31% | 22% | 13 h 30 min |
| August 26 | 83°F | 61°F | 31% | 21% | 13 h 20 min |
| August 27 | 83°F | 61°F | 31% | 21% | 13 h 20 min |
| August 28 | 83°F | 61°F | 31% | 21% | 13 h 20 min |
| August 29 | 83°F | 61°F | 31% | 21% | 13 h 20 min |
| August 30 | 83°F | 60°F | 31% | 21% | 13 h 10 min |
| August 31 | 82°F | 60°F | 31% | 21% | 13 h 10 min |
- Normal high
- 84°FAugust average
- Normal low
- 63°FAugust average
- Precipitation
- 4.56 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 24
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014737; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Allentown in August?
On a given August day the chance of 0.01 inch or more is 33% on average, highest around August 1 (35%). In all, 4.56 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Allentown, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014737.
How humid and windy is Allentown in August?
At 3 p.m. the normal temperature is 80°F with 51% relative humidity and a dew point of 60°F; at 6 a.m. it is 62°F with 90% humidity. The wind averages 5.6 mph, most often from the west in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 62°F | 59°F | 90% | 3.7 mph | 60% |
| 9 a.m. | 71°F | 61°F | 71% | 6.0 mph | 63% |
| noon | 78°F | 60°F | 55% | 7.4 mph | 58% |
| 3 p.m. | 80°F | 60°F | 51% | 8.5 mph | 53% |
| 6 p.m. | 76°F | 60°F | 57% | 7.0 mph | 66% |
| 9 p.m. | 69°F | 61°F | 74% | 4.9 mph | 70% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014737. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Allentown?
The warmest August temperature on Allentown's official record (since 1922) is 100°F, on August 6, 1924; the coldest is 41°F, on August 31, 1934. The wettest August brought 13.47 in (2011).
The August mean against the 1991-2020 normal of 73.6°F: 2021 75.2°F (+1.6), 2022 76.1°F (+2.5), 2023 71.3°F (−2.3), 2024 72.1°F (−1.5), 2025 70.0°F (−3.6), 2026 73.1°F (−0.5). 2 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.2°F | +1.6°F | 7.82 in |
| 2022 | 76.1°F | +2.5°F | 2.84 in |
| 2023 | 71.3°F | −2.3°F | 4.78 in |
| 2024 | 72.1°F | −1.5°F | 5.63 in |
| 2025 | 70.0°F | −3.6°F | 1.60 in |
| 2026 | 73.1°F | −0.5°F | 4.75 in |
Source: records: ACIS, NWS threaded record ABEthr; recent months: ACIS, station USW00014737. Records and recent months use complete months only.
How does August in Allentown compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, August normal highs run from 75°F in Laporte to 87°F in Marcus Hook; Allentown's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Allentown in July86°F by day, 65°F at night
- Allentown in September77°F by day, 55°F at night
- Allentown through the yearEvery month, frost dates, records and recent years
- Pennsylvania in AugustThe statewide normal and the warmest and coolest places
- Marcus Hook: Pennsylvania's warmest Augustnormal high 87°F