The day starts quietly at Reagan National on Sunday, July 19, 2026, with clear skies, temperatures around 79°F and that familiar D.C. midsummer mugginess, thanks to dew points sitting in the low 70s. A few isolated morning showers may pop up early, but they should fade before midmorning. From there, expect partly sunny skies and an afternoon high near 86°F. Northwest winds will run a light to moderate 6 to 9 mph, so most outdoor plans are in good shape.
Afternoon And Tonight
Outside of a stray shower early, the rest of Sunday looks mostly dry, with only about a 15 to 25 percent chance of measurable rain under partly sunny skies and highs near 86°F. Tonight turns mostly clear with lows around 68°F and lighter northeast winds, setting up a comfortable evening on the Mall or along the riverfront. If you are out on the water or strolling the bay, keep a casual eye on the sky during the late afternoon, just in case a rogue shower develops.
Tuesday Storm Risk
Circle Tuesday, July 21, 2026. A strong cold front is expected to drive through the region and could fire up widespread showers and thunderstorms, some of which may turn severe with damaging straight-line winds. Forecasters are also flagging the chance for localized flash flooding where storms slow down or repeatedly track over the same area. These concerns are highlighted in the National Weather Service discussion for Baltimore and Washington.
Coastal And Marine
Southerly flow is expected to crank up Monday night into Tuesday, which could nudge water levels higher along the Chesapeake and bring tides near minor flood thresholds at Annapolis during the tidal cycle. Small craft operators should be ready for choppier conditions and the possibility of advisories, and anyone heading out should check local tide predictions first. Tide forecasts for Annapolis are available from NOAA Tides & Currents.
Plan Ahead
If you have outdoor events on the books for Tuesday, line up a backup indoor option and be ready to move quickly if storms develop. Avoid driving through standing water and consider securing loose yard furniture Monday night if southerly winds start to pick up. Check the latest watches and warnings before heading out and keep your phone charged so you do not miss any sudden alerts.
