Sterling weather in August: Sterling, Virginia: normal highs, lows, rain and records for August
Sterling in August has a normal high of 86°F and a normal low of 65°F, a daily mean of 76°F, falling from 87°F on the 1st to 84°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.53 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 18°C, 90 mm of precipitation in August.
- NOAA stationWashington Dulles International Airport
- Station IDUSW00093738
- Location38.94°N 77.46°W
- Elevation290 ft (88 m)
- From the center5 miles
- Population (census place)31,251
- Jan 43° 25°
- Feb 46° 27°
- Mar 55° 34°
- Apr 67° 43°
- May 75° 53°
- Jun 83° 62°
- Jul 88° 67°
- Aug 86° 65°
- Sep 79° 58°
- Oct 68° 45°
- Nov 57° 36°
- Dec 47° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Sterling in August?
The normal high is 86°F and the normal low 65°F, for a daily mean of 75.7°F. August is 1.5°F cooler than July and 7.1°F warmer than September. August is the 2nd warmest month of the year in Sterling and the 6th wettest. Across the month the normal high falls 3°F, from 87°F on August 1 to 84°F on August 31. From one year to the next August's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 73°F and 78°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 87°F | 67°F | 33% | 20% |
| August 8 | 87°F | 66°F | 32% | 19% |
| August 15 | 87°F | 66°F | 31% | 19% |
| August 22 | 86°F | 65°F | 30% | 18% |
| August 31 | 84°F | 63°F | 29% | 18% |
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 | 87°F | 67°F | 33% | 20% | 14 h 10 min |
| August 2 | 87°F | 67°F | 33% | 20% | 14 h 10 min |
| August 3 | 87°F | 67°F | 33% | 20% | 14 h 10 min |
| August 4 | 87°F | 67°F | 33% | 20% | 14 h 10 min |
| August 5 | 87°F | 66°F | 33% | 20% | 14 h 10 min |
| August 6 | 87°F | 66°F | 33% | 20% | 14 h |
| August 7 | 87°F | 66°F | 32% | 20% | 14 h |
| August 8 | 87°F | 66°F | 32% | 19% | 14 h |
| August 9 | 87°F | 66°F | 32% | 19% | 14 h |
| August 10 | 87°F | 66°F | 32% | 19% | 13 h 50 min |
| August 11 | 87°F | 66°F | 32% | 19% | 13 h 50 min |
| August 12 | 87°F | 66°F | 32% | 19% | 13 h 50 min |
| August 13 | 87°F | 66°F | 32% | 19% | 13 h 50 min |
| August 14 | 87°F | 66°F | 32% | 19% | 13 h 50 min |
| August 15 | 87°F | 66°F | 31% | 19% | 13 h 40 min |
| August 16 | 87°F | 65°F | 31% | 19% | 13 h 40 min |
| August 17 | 87°F | 65°F | 31% | 19% | 13 h 40 min |
| August 18 | 86°F | 65°F | 31% | 19% | 13 h 40 min |
| August 19 | 86°F | 65°F | 31% | 19% | 13 h 40 min |
| August 20 | 86°F | 65°F | 30% | 19% | 13 h 30 min |
| August 21 | 86°F | 65°F | 30% | 18% | 13 h 30 min |
| August 22 | 86°F | 65°F | 30% | 18% | 13 h 30 min |
| August 23 | 86°F | 65°F | 30% | 18% | 13 h 30 min |
| August 24 | 86°F | 64°F | 29% | 18% | 13 h 20 min |
| August 25 | 85°F | 64°F | 29% | 18% | 13 h 20 min |
| August 26 | 85°F | 64°F | 29% | 18% | 13 h 20 min |
| August 27 | 85°F | 64°F | 29% | 18% | 13 h 20 min |
| August 28 | 85°F | 64°F | 29% | 18% | 13 h 10 min |
| August 29 | 85°F | 63°F | 29% | 18% | 13 h 10 min |
| August 30 | 85°F | 63°F | 29% | 18% | 13 h 10 min |
| August 31 | 84°F | 63°F | 29% | 18% | 13 h 10 min |
- Normal high
- 86°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 3.53 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 9
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 27
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093738; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Sterling in August?
On a given August day the chance of 0.01 inch or more is 31% on average, highest around August 1 (33%). In all, 3.53 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Sterling, 9 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093738.
How humid and windy is Sterling in August?
At 3 p.m. the normal temperature is 83°F with 50% relative humidity and a dew point of 62°F; at 6 a.m. it is 65°F with 89% humidity. The wind averages 5.6 mph, most often from the west-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 65°F | 62°F | 89% | 3.7 mph | 34% |
| 9 a.m. | 74°F | 64°F | 70% | 6.7 mph | 41% |
| noon | 81°F | 63°F | 54% | 7.6 mph | 29% |
| 3 p.m. | 83°F | 62°F | 50% | 7.9 mph | 21% |
| 6 p.m. | 79°F | 63°F | 57% | 7.0 mph | 34% |
| 9 p.m. | 72°F | 64°F | 75% | 4.4 mph | 46% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00093738. 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 Sterling?
The warmest August temperature on this station's record (since 1960) is 104°F, on August 20, 1983; the coldest is 38°F, on August 29, 1982. The wettest August brought 10.71 in (1984).
The August mean against the 1991-2020 normal of 75.7°F: 2021 78.6°F (+2.9), 2022 77.5°F (+1.8), 2023 77.2°F (+1.5), 2024 76.9°F (+1.2), 2025 72.2°F (−3.5), 2026 77.5°F (+1.8). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.6°F | +2.9°F | 4.93 in |
| 2022 | 77.5°F | +1.8°F | 2.30 in |
| 2023 | 77.2°F | +1.5°F | 1.85 in |
| 2024 | 76.9°F | +1.2°F | 5.13 in |
| 2025 | 72.2°F | −3.5°F | 0.85 in |
| 2026 | 77.5°F | +1.8°F | 4.85 in |
Source: records: ACIS, station USW00093738; recent months: ACIS, station USW00093738. Records and recent months use complete months only.
How does August in Sterling compare across Virginia?
Across the 81 places PlainClimate covers in Virginia, August normal highs run from 79°F in Floyd to 90°F in Chesapeake; Sterling's is 86°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.