August 2026 high tide flooding predictions

August 2026 high tide flooding predictions © USHarbors

Monthly High Tide Flooding Outlook - August 2026

Although mean sea level is generally higher in late summer and early fall, due in part to warmer water temperatures and changing weather patterns, only a few U.S. harbors are likely to see flooding this month.

On the West Coast, San Diego and Santa Monica are likely to see high water events, while flooding is also possible in La Jolla, Los Angeles, and North Spit. High water is possible in all Hawaiian harbors this month, especially on the new moon on August 12 and the full moon on August 27, but flooding is likely in the ports of Kahului, Hilo, and Kawaihae. Elsewhere across the country, flooding is possible in only three harbors: Fort Pulaski, GA; Cedar Key, FL; and Bay Waveland Yacht Club, MS.

Note that a harbor's absence from this list, despite it being in proximity to a harbor that is (for example: Montauk, New York, and Woods Hole, Massachusetts, both of which are near harbors that are listed as seeing possible flooding, don't make the list themselves), does not mean that flooding is not possible. Instead, it simply means that NOAA either does not have a sufficiently validated model to make an accurate prediction, or that the local hydrodynamics makes such a prediction impossible.

Make sure to print out the tide chart for your favorite harbor so that you are prepared, no matter what the coastal conditions end up delivering.

• August 12 - New Moon
• August 27 - Full Moon

View the detailed flooding report for harbors by region below.

Northeast: Possible & Likely Flood Days

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

Mid-Atlantic: Possible & Likely Flood Days

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

Southeast: Possible & Likely Flood Days

• Fort Pulaski, GA — POSSIBLE August 12

Gulf Coast: Possible & Likely Flood Days

• Cedar Key, FL — POSSIBLE August 11-13
• Bay Waveland Yacht Club, MS — POSSIBLE August 10

West Coast: Possible & Likely Flood Days

• San Diego, CA — POSSIBLE August 10, 12; LIKELY August 11 (85%)
• La Jolla, CA — POSSIBLE August 10, 11
• Los Angeles, CA — LIKELY August 10, 11
• Santa Monica, CA — LIKELY August 10; LIKELY August 11 (55%)
• North Spit, CA — POSSIBLE August 11

Hawaii: Possible & Likely Flood Days

Kauai:

• Nawiliwili, HI — POSSIBLE August 9-12

Oahu:

• Mokuoloe, HI — POSSIBLE August 9-12
• Honolulu, HI — POSSIBLE August 9-12

Maui:

• Kahului, Kahului Harbor, HI — POSSIBLE August 9, 13; LIKELY August 10-12 (60-70%)

Hawaii, Big Island:

• Kawaihae, HI — POSSIBLE August 8, 9, 13; LIKELY August 10-12 (55-70%)
• Hilo, Hilo Bay, Kuhio Bay, HI — POSSIBLE August 9, 13; LIKELY August 10-12 (70-90%)