I-66 weather conditions near Washington, District of Columbia

Roadnow AI Agent Live Update

7 day weather forecast

• Current condition: Fair 86°F 2025-09-05T19:15:00-04:00
• Tonight 2025-09-05, Mostly Clear. Mostly clear, with a low around 71. South wind 5 to 8 mph.
• Saturday 2025-09-06, Mostly Sunny then Showers Likely. A slight chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 89. Southwest wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
• Saturday Night 2025-09-06, Showers. Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 62. North wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
• Sunday 2025-09-07, Chance Showers. A chance of showers, mainly before 8am. Cloudy through mid morning, then gradual clearing, with a high near 75. Northwest wind around 6 mph. Chance of precipitation is 30%.
• Sunday Night 2025-09-07, Mostly Clear. Mostly clear, with a low around 55. Northwest wind around 5 mph.
• Monday 2025-09-08, Sunny. Sunny, with a high near 75.
• Monday Night 2025-09-08, Mostly Clear. Mostly clear, with a low around 55.
• Tuesday 2025-09-09, Sunny. Sunny, with a high near 76.
• Tuesday Night 2025-09-09, Partly Cloudy. Partly cloudy, with a low around 58.
• Wednesday 2025-09-10, Partly Sunny. Partly sunny, with a high near 75.
• Wednesday Night 2025-09-10, Partly Cloudy. Partly cloudy, with a low around 58.
• Thursday 2025-09-11, Sunny. Sunny, with a high near 81.
• Thursday Night 2025-09-11, Mostly Clear. Mostly clear, with a low around 59.
• Friday 2025-09-12, Sunny. Sunny, with a high near 76.