The Lyndon Baines Johnson Memorial Grove on the Potomac is open year round from 6 am to 10 pm. The Columbia Island Marina is open from 6 am to midnight. Current slip holders may use the docks at any time.
Summers in the park are generally hot and humid, with daytime highs frequently above 90 degrees Fahrenheit and scattered afternoon thunderstorms. Please carry water while participating in physical activity and be prepared to take shelter from lightning.
Winters in the park are generally cold, with nighttime lows frequently near freezing and occasional snowfall. Please be alert for snowplows and icy spots on roadways.
Weather during spring and fall is generally moderate, but can change quickly, especially near the Potomac River. Layers of clothing are recommended.