Washington woke up to mostly cloudy skies and mild humidity on Monday, July 20, 2026, with temperatures in the low 70s at Reagan National Airport. That decent start will not stick around for long. Strong to potentially severe thunderstorms are likely on Tuesday, July 21, 2026, and could bring damaging wind gusts, hail, and locally heavy rain. Monday itself is expected to turn mostly sunny and warm with a high near 86°F, giving residents a short window to finish outdoor plans before the main storm threat moves in. Boaters and waterfront neighborhoods should follow updates closely.
When To Watch
Late Monday night into early Tuesday morning, roughly 2 to 5 a.m. on Tuesday, July 21, 2026, there is a chance for scattered showers and isolated thunderstorms. The main period for higher impact weather, though, is Tuesday afternoon into the evening. Forecasters expect a warm, humid air mass to spread over the region with highs near 90°F on Tuesday, July 21, along with gusty southerly winds. The National Weather Service pegs the odds of showers and thunderstorms that day at about 80 percent. Damaging wind gusts are the primary severe threat, although large hail and an isolated tornado or two cannot be ruled out in stronger storms, and training cells may produce localized flash flooding. New rainfall amounts between a quarter and a half inch are likely in the heavier storms, with locally higher totals possible, according to the National Weather Service.
This Morning And The Commute
On Monday, July 20, skies should turn mostly sunny once the morning clouds thin out, with a high near 86°F and light east winds. It is a solid opportunity to tackle outdoor chores or errands before the stormier pattern arrives. Tuesday, July 21, looks like a different story for commuters, as sudden downpours, lightning, and gusty winds could slow traffic and cause short term transit disruptions during the afternoon and evening commute.
Marine And Tides
Boaters should plan around a Small Craft Advisory for favored portions of the bay from 8 p.m. Monday, July 20, to 5 a.m. Tuesday, July 21. Increasing southeast to south flow could push water levels toward Action stages, with Annapolis possibly nearing minor inundation. Secure loose gear, avoid exposed boat traffic during the advisory period, and keep an eye on the latest marine statements from the National Weather Service before heading out.
Plan Ahead
If you have outdoor plans on Tuesday, July 21, shift them indoors if you can and line up a backup plan. Keep phones charged so you can receive any watches or warnings. And remember the basic flood safety rule: if you see flooded roads, turn around. Do not drive through standing water.
Context
This forecast updates earlier July 9 coverage of storm and tide risks for the D.C. area, and we will refresh this page if watches or warnings are issued. For more background on the region’s flood and coastal concerns, see our July 9 write up on how the city braces for deluge.
