Maryland has hot summers and cool winters: NOAA's 1991–2020 normals for Baltimore/Washington International Airport give highs of 86.5–88.8°F in July and August and 43.2°F in January, with 7.5 inches of snow in February and July the wettest month at 4.48 inches. Choose by activity; we have no verified dataset for crowds, events or prices.
Month-by-month climate table
| Month | Normal high | Normal low | Normal precipitation | Normal snowfall | Verified notes |
|---|---|---|---|---|---|
| January | 43.2°F | 25.4°F | 3.08 in | 6.4 in | — |
| February | 46.4°F | 26.9°F | 2.90 in | 7.5 in | — |
| March | 54.8°F | 33.9°F | 4.01 in | 2.8 in | — |
| April | 66.5°F | 43.6°F | 3.39 in | 0.0 in | — |
| May | 75.5°F | 53.3°F | 3.85 in | 0.0 in | — |
| June | 84.4°F | 62.6°F | 3.98 in | 0.0 in | — |
| July | 88.8°F | 67.7°F | 4.48 in | 0.0 in | — |
| August | 86.5°F | 65.8°F | 4.09 in | 0.0 in | — |
| September | 79.7°F | 58.8°F | 4.44 in | 0.0 in | — |
| October | 68.3°F | 46.5°F | 3.94 in | 0.0 in | — |
| November | 57.3°F | 36.5°F | 3.13 in | 0.1 in | — |
| December | 47.5°F | 29.6°F | 3.71 in | 2.5 in | — |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, Baltimore/Washington International Airport (USW00093721), retrieved October 20, 2026. Normals are 30-year averages; actual weather varies.
How to choose your month
- Warmest: June–August (BWI highs 84.4–88.8°F).
- Coolest: December–February (BWI highs 43.2–47.5°F).
- Snowiest: February (7.5 inches) and January (6.4).
- Wettest: July (4.48 inches) and September (4.44).
Limits of this guide
Normals describe typical conditions, not forecasts, and we have no verified dataset for coastal weather, events, crowds or prices by month, so this page makes no such claims. Use the National Weather Service for forecasts.