Baltimore weather in August: Baltimore, Maryland: normal highs, lows, rain and records for August
Baltimore in August has a normal high of 87°F and a normal low of 66°F, a daily mean of 76°F, falling from 88°F on the 1st to 85°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 4.09 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 19°C, 104 mm of precipitation in August.
- NOAA stationBaltimore Wash International Airport
- Station IDUSW00093721
- Location39.17°N 76.68°W
- Elevation156 ft (48 m)
- From the center10 miles
- Population568,271
- Jan 43° 25°
- Feb 46° 27°
- Mar 55° 34°
- Apr 67° 44°
- May 76° 53°
- Jun 84° 63°
- Jul 89° 68°
- Aug 87° 66°
- Sep 80° 59°
- Oct 68° 47°
- Nov 57° 37°
- Dec 48° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Baltimore in August?
The normal high is 87°F and the normal low 66°F, for a daily mean of 76.2°F. August is 2.1°F cooler than July and 7.0°F warmer than September. August is the 2nd warmest month of the year in Baltimore and the 3rd wettest. Across the month the normal high falls 3°F, from 88°F on August 1 to 85°F on August 31. From one year to the next August's mean temperature typically moves about 2.1°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 88°F | 67°F | 34% | 23% |
| August 8 | 87°F | 67°F | 33% | 22% |
| August 15 | 87°F | 66°F | 32% | 21% |
| August 22 | 86°F | 65°F | 30% | 19% |
| August 31 | 85°F | 64°F | 28% | 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 | 88°F | 67°F | 34% | 23% | 14 h 10 min |
| August 2 | 88°F | 67°F | 33% | 23% | 14 h 10 min |
| August 3 | 88°F | 67°F | 33% | 23% | 14 h 10 min |
| August 4 | 88°F | 67°F | 33% | 22% | 14 h 10 min |
| August 5 | 88°F | 67°F | 33% | 22% | 14 h 10 min |
| August 6 | 88°F | 67°F | 33% | 22% | 14 h |
| August 7 | 87°F | 67°F | 33% | 22% | 14 h |
| August 8 | 87°F | 67°F | 33% | 22% | 14 h |
| August 9 | 87°F | 67°F | 33% | 22% | 14 h |
| August 10 | 87°F | 67°F | 33% | 22% | 14 h |
| August 11 | 87°F | 67°F | 32% | 22% | 13 h 50 min |
| August 12 | 87°F | 66°F | 32% | 22% | 13 h 50 min |
| August 13 | 87°F | 66°F | 32% | 21% | 13 h 50 min |
| August 14 | 87°F | 66°F | 32% | 21% | 13 h 50 min |
| August 15 | 87°F | 66°F | 32% | 21% | 13 h 40 min |
| August 16 | 87°F | 66°F | 31% | 21% | 13 h 40 min |
| August 17 | 87°F | 66°F | 31% | 21% | 13 h 40 min |
| August 18 | 87°F | 66°F | 31% | 20% | 13 h 40 min |
| August 19 | 86°F | 66°F | 31% | 20% | 13 h 40 min |
| August 20 | 86°F | 65°F | 30% | 20% | 13 h 30 min |
| August 21 | 86°F | 65°F | 30% | 20% | 13 h 30 min |
| August 22 | 86°F | 65°F | 30% | 19% | 13 h 30 min |
| August 23 | 86°F | 65°F | 29% | 19% | 13 h 30 min |
| August 24 | 86°F | 65°F | 29% | 19% | 13 h 20 min |
| August 25 | 86°F | 65°F | 29% | 19% | 13 h 20 min |
| August 26 | 85°F | 65°F | 29% | 19% | 13 h 20 min |
| August 27 | 85°F | 64°F | 29% | 19% | 13 h 20 min |
| August 28 | 85°F | 64°F | 28% | 19% | 13 h 10 min |
| August 29 | 85°F | 64°F | 28% | 18% | 13 h 10 min |
| August 30 | 85°F | 64°F | 28% | 18% | 13 h 10 min |
| August 31 | 85°F | 64°F | 28% | 18% | 13 h 10 min |
- Normal high
- 87°FAugust average
- Normal low
- 66°FAugust average
- Precipitation
- 4.09 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 8
- 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
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093721; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Baltimore in August?
On a given August day the chance of 0.01 inch or more is 31% on average, highest around August 1 (34%). In all, 4.09 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Baltimore, 8 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093721.
How humid and windy is Baltimore in August?
At 3 p.m. the normal temperature is 83°F with 51% relative humidity and a dew point of 62°F; at 6 a.m. it is 66°F with 88% humidity. The wind averages 5.8 mph, most often from the east-southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 66°F | 63°F | 88% | 3.7 mph | 28% |
| 9 a.m. | 76°F | 64°F | 67% | 7.3 mph | 33% |
| noon | 81°F | 63°F | 54% | 7.9 mph | 20% |
| 3 p.m. | 83°F | 62°F | 51% | 8.4 mph | 20% |
| 6 p.m. | 79°F | 63°F | 59% | 6.8 mph | 29% |
| 9 p.m. | 72°F | 64°F | 76% | 4.2 mph | 46% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00093721. 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 Baltimore?
The warmest August temperature on Baltimore's official record (since 1872) is 105°F, on August 7, 1918; the coldest is 45°F, on August 30, 1986. The wettest August brought 18.35 in (1955).
The August mean against the 1991-2020 normal of 76.2°F: 2021 79.7°F (+3.5), 2022 79.1°F (+2.9), 2023 77.2°F (+1.0), 2024 77.0°F (+0.8), 2025 72.7°F (−3.5), 2026 77.5°F (+1.3). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.7°F | +3.5°F | 4.36 in |
| 2022 | 79.1°F | +2.9°F | 3.71 in |
| 2023 | 77.2°F | +1.0°F | 3.73 in |
| 2024 | 77.0°F | +0.8°F | 6.22 in |
| 2025 | 72.7°F | −3.5°F | 2.07 in |
| 2026 | 77.5°F | +1.3°F | 5.33 in |
Source: records: ACIS, NWS threaded record BWIthr; recent months: ACIS, station USW00093721. Records and recent months use complete months only.
How does August in Baltimore 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; Baltimore's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.