Rockville weather in August: Rockville, Maryland: normal highs, lows, rain and records for August
Rockville in August has a normal high of 85°F and a normal low of 67°F, a daily mean of 76°F, falling from 87°F on the 1st to 83°F by the 31st. Measurable precipitation falls on 7 days in a normal August, 3.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 19°C, 77 mm of precipitation in August.
- NOAA stationRockville (1 mi NE)
- Station IDUSC00187705
- Location39.10°N 77.15°W
- Elevation440 ft (134 m)
- From the center1 miles
- Population68,417
- Jan 42° 27°
- Feb 45° 28°
- Mar 54° 36°
- Apr 66° 46°
- May 74° 55°
- Jun 82° 64°
- Jul 87° 69°
- Aug 85° 67°
- Sep 78° 60°
- Oct 66° 48°
- Nov 56° 38°
- Dec 46° 31°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Rockville in August?
The normal high is 85°F and the normal low 67°F, for a daily mean of 75.9°F. August is 2.1°F cooler than July and 7.2°F warmer than September. August is the 2nd warmest month of the year in Rockville and the 11th wettest. Across the month the normal high falls 4°F, from 87°F on August 1 to 83°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 74°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 87°F | 69°F | 29% | 18% |
| August 8 | 86°F | 68°F | 28% | 18% |
| August 15 | 85°F | 67°F | 27% | 18% |
| August 22 | 84°F | 66°F | 26% | 17% |
| August 31 | 83°F | 65°F | 27% | 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 | 69°F | 29% | 18% | 14 h 10 min |
| August 2 | 86°F | 68°F | 29% | 18% | 14 h 10 min |
| August 3 | 86°F | 68°F | 29% | 18% | 14 h 10 min |
| August 4 | 86°F | 68°F | 28% | 18% | 14 h 10 min |
| August 5 | 86°F | 68°F | 28% | 18% | 14 h 10 min |
| August 6 | 86°F | 68°F | 28% | 18% | 14 h |
| August 7 | 86°F | 68°F | 28% | 18% | 14 h |
| August 8 | 86°F | 68°F | 28% | 18% | 14 h |
| August 9 | 86°F | 68°F | 28% | 18% | 14 h |
| August 10 | 86°F | 68°F | 27% | 18% | 14 h |
| August 11 | 86°F | 68°F | 27% | 18% | 13 h 50 min |
| August 12 | 86°F | 68°F | 27% | 18% | 13 h 50 min |
| August 13 | 85°F | 68°F | 27% | 18% | 13 h 50 min |
| August 14 | 85°F | 67°F | 27% | 18% | 13 h 50 min |
| August 15 | 85°F | 67°F | 27% | 18% | 13 h 40 min |
| August 16 | 85°F | 67°F | 27% | 18% | 13 h 40 min |
| August 17 | 85°F | 67°F | 27% | 18% | 13 h 40 min |
| August 18 | 85°F | 67°F | 26% | 17% | 13 h 40 min |
| August 19 | 85°F | 67°F | 26% | 17% | 13 h 40 min |
| August 20 | 85°F | 67°F | 26% | 17% | 13 h 30 min |
| August 21 | 85°F | 67°F | 26% | 17% | 13 h 30 min |
| August 22 | 84°F | 66°F | 26% | 17% | 13 h 30 min |
| August 23 | 84°F | 66°F | 26% | 17% | 13 h 30 min |
| August 24 | 84°F | 66°F | 26% | 17% | 13 h 20 min |
| August 25 | 84°F | 66°F | 26% | 17% | 13 h 20 min |
| August 26 | 84°F | 66°F | 26% | 17% | 13 h 20 min |
| August 27 | 84°F | 66°F | 26% | 17% | 13 h 20 min |
| August 28 | 83°F | 66°F | 26% | 17% | 13 h 10 min |
| August 29 | 83°F | 65°F | 27% | 17% | 13 h 10 min |
| August 30 | 83°F | 65°F | 27% | 18% | 13 h 10 min |
| August 31 | 83°F | 65°F | 27% | 18% | 13 h 10 min |
- Normal high
- 85°FAugust average
- Normal low
- 67°FAugust average
- Precipitation
- 3.05 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 6
- 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
- 26
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00187705; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Rockville in August?
On a given August day the chance of 0.01 inch or more is 27% on average, highest around August 1 (29%). In all, 3.05 in falls on 7 days of a normal August, 1 of them with an inch or more.
In a normal August in Rockville, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00187705.
What are the records for August in Rockville?
The warmest August temperature on this station's record (since 1907) is 104°F, on August 7, 1918; the coldest is 39°F, on August 17, 1979. The wettest August brought 10.41 in (1955).
Source: records: ACIS, station USC00187705. Records and recent months use complete months only.
How does August in Rockville compare across Maryland?
Across the 26 places PlainClimate covers in Maryland, August normal highs run from 78°F in Frostburg to 88°F in Vienna; Rockville's is 85°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.