March 2026 high tide flooding predictions

Storm surge floodwaters overrun a park on Boston Harbor during a nor easter © Shutterstock, Keith J Finks

After one of the most severe winters in recent years, March will bless harbors and communities across the United States with a month of benign conditions, at least as they relate to so-called "sunny day" flooding. NOAA is predicting that such coastal flooding is possible in only five harbors across the entire country: Boston, Massachusetts; Kings Point, NY; Galveston Bay, Texas; South Beach, Oregon; and Toke Point, Washington.

While higher high tides (and lower low tides) can be expected on and around the full moon on March 3 and the new moon on March 18, most harbors are not forecast to experience flooding during these periods. As always, if a storm happens to occur around these high-water days, known as spring tides, it may lead to increased coastal erosion and flooding.

Note that while NOAA only makes these flooding predictions for harbors with National Ocean Service water level stations, other locations along the coast may experience similar high-water events during these time periods.

March 3 - Full Moon
March 18 - New Moon

View the detailed flooding report for harbors in every region below, and make sure to print your tide charts from US Harbors to be prepared for the high water level days in your favorite harbor.

Northeast: Possible & Likely Flood Days

• Boston, MA — POSSIBLE March 22
• Kings Point, NY — POSSIBLE March 20-23

• Coastal flooding based primarily on tides is unlikely this month.

• Coastal flooding based primarily on tides is unlikely this month.

• Eagle Point, Galveston Bay, TX — POSSIBLE March 25-28

• South Beach, OR — POSSIBLE March 22
• Toke Point, WA — POSSIBLE March 21, 22, 23

Kauai:

• Coastal flooding based primarily on tides is unlikely this month.

• Coastal flooding based primarily on tides is unlikely this month.

• Coastal flooding based primarily on tides is unlikely this month.

• Coastal flooding based primarily on tides is unlikely this month.

About these Predictions: "These flooding likelihoods are derived from a probabilistic model that incorporates tide predictions, sea level rise trends, and seasonal changes in coastal sea level to predict the potential that a higher than normal high tide may exceed established National Ocean Service flood thresholds. During these periods, high tide flooding may occur in flood-prone areas." NOAA.