Climate averages 1991–2020
Baltimore weather
in August.
A hot, wet month: the 2nd warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Baltimore: daytime highs average 28.6°C and nights cool to about 20.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 93 mm of rain on roughly 10 days, which makes August a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 42 min on an average August day.
The nearest other city in this atlas is Columbia (Maryland), United States (20 km away). In August its highs average 28.4°C, about as warm as Baltimore, with 95 mm of rain.
Among the 498 cities listed in the United States, Baltimore ranks joint 299th of 498 for the warmest August highs and joint 338th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Baltimore is 1.3°C cooler than that mean.
From August to September, average highs fall by 3.7°C to 24.8°C, and monthly rainfall rises from 93 mm to 120 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Baltimore climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.8°C-2.9°C | -2.9°C | 90 | 9.0 | 9.710 h |
| February | 6.4°C-2.5°C | -2.5°C | 84 | 9.2 | 10.711 h |
| March | 10.9°C1.3°C | 1.3°C | 114 | 10.5 | 11.912 h |
| April | 17.2°C7.0°C | 7.0°C | 97 | 10.4 | 13.213 h |
| May | 22.2°C12.7°C | 12.7°C | 96 | 11.0 | 14.314 h |
| June | 27.0°C18.0°C | 18.0°C | 90 | 10.9 | 14.915 h |
| July | 29.6°C21.0°C | 21.0°C | 97 | 11.4 | 14.615 h |
| August, selected | 28.6°C20.2°C | 20.2°C | 93 | 10.4 | 13.714 h |
| September | 24.8°C16.6°C | 16.6°C | 120 | 9.4 | 12.512 h |
| October | 18.6°C10.2°C | 10.2°C | 102 | 8.4 | 11.211 h |
| November | 12.3°C4.2°C | 4.2°C | 86 | 8.3 | 10.110 h |
| December | 7.1°C-0.4°C | -0.4°C | 109 | 9.6 | 9.59 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Columbia (Maryland), United States in AugustUnited States · 20 kmHigh 28.4°C · Low 20.2°C · 95 mm rain
- Silver Spring in AugustUnited States · 49 kmHigh 29.1°C · Low 20.1°C · 89 mm rain
- Washington in AugustUnited States · 57 kmHigh 29.8°C · Low 20.6°C · 89 mm rain
- Germantown in AugustUnited States · 58 kmHigh 29.0°C · Low 19.6°C · 85 mm rain
- Arlington (Virginia), United States in AugustUnited States · 62 kmHigh 29.3°C · Low 20.1°C · 89 mm rain
- Alexandria, United States in AugustUnited States · 66 kmHigh 29.5°C · Low 20.7°C · 89 mm rain
- Centreville in AugustUnited States · 86 kmHigh 29.3°C · Low 20.4°C · 84 mm rain
- Wilmington (Delaware), United States in AugustUnited States · 105 kmHigh 28.2°C · Low 19.9°C · 100 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Baltimore) is explained once on the Baltimore year overview and on the Sources, method and limits page.