High Tide Flooding Outlook for July 2026

Posted June 30, 2026
Last Updated June 30, 2026 @ 10:56am

Monthly High Tide Flooding Outlook – July 2026

The East Coast, which last month saw some of its greatest potential for flooding during the entire year, will experience a reprieve in July as NOAA predicts that high-water events are only possible in Boston, Massachusetts; Portland and Bar Harbor, Maine; and Fort Pulaski, Georgia. The West Coast and Hawaii will not be so fortunate, with all harbors in the Hawaiian Islands likely to experience flooding this month and major harbors in San Diego and Los Angeles similarly predicted to see so-called “sunny day” flooding events, in addition to the ports of Monterey and North Spit, California. Tides will be highest on and around the new moon, on July 14, and the full moon, on July 29. If a storm occurs around these dates, the potential for flooding and coastal erosion may increase; water levels are also typically higher in the summertime due to increasing water temperatures and changing weather patterns.

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.

July 13 – Perigee
July 14 – New Moon
July 29 – Full Moon

View the detailed flooding report for harbors by region below.

Northeast: Possible & Likely Flood Days

Bar Harbor, ME — POSSIBLE July 14-16
Portland, ME — POSSIBLE July 13, 15, 16
Boston, MA — POSSIBLE July 13, 15, 16

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 July 13, 14

Gulf Coast: Possible & Likely Flood Days

Coastal flooding based primarily on tides is unlikely this month.

West Coast: Possible & Likely Flood Days

San Diego, CA — POSSIBLE July 15; LIKELY July 12-14
La Jolla, CA — POSSIBLE July 15; LIKELY July 12-14
Los Angeles, CA — LIKELY July 12-14
Santa Monica, CA — LIKELY July 12-14
Port San Luis, CA — POSSIBLE July 12-14
Monterey, CA — POSSIBLE July 12, 14; LIKELY July 13
Point Reyes, CA — POSSIBLE July 12, 14; LIKELY July 13
North Spit, CA — POSSIBLE July 12, 14, 15; LIKELY July 13

Hawaii: Possible & Likely Flood Days

Kauai:

Nawiliwili, HI — POSSIBLE July 11, 15; LIKELY July 12-14

Oahu:

Mokuoloe, HI — POSSIBLE July 11, 12, 15; LIKELY July 13, 14
Honolulu, HI — POSSIBLE July 11, 12, 14, 15; LIKELY July 13

Maui:

Kahului, Kahului Harbor, HI — POSSIBLE July 11, 16; LIKELY July 12-15

Hawaii, Big Island:

Kawaihae, HI — POSSIBLE July 1, 10, 16, 27-30; LIKELY July 11-15
Hilo, Hilo Bay, Kuhio Bay, HI — POSSIBLE July 11, 16, 28-30; LIKELY July 12-15

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

High Tide Flooding in Boston, Massachusetts. Stone jetty awash at high tide.

Stone jetty awash at high tide. High Tide Flooding in Boston, Massachusetts. Photo by Charlie Nutting

Flood Outlook