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  1. Home
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  3. High Tide Flooding Archive
  4. High Tide Bulletin: Summer 2021

NOAA High Tide Bulletin

Summer 2021: When you may experience higher than normal tides between June and August, 2021.

Tides are the regular rise and fall of the sea surface caused by the gravitational pull of the moon and sun and their position relative to the earth. There are some factors that cause the tides to be higher than what is "normally" seen from day to day. Depending on non-tidal conditions (wind, storms, etc.), regions may experience impacts before or after the dates mentioned here.

Higher than normal high tides alone do not necessarily cause coastal flooding. However, they are becoming increasingly impactful due to continued sea level rise. High tide flooding that inundates busy streets, and washes out beaches is more likely to occur during these periods depending on your location along the coast. More severe flooding may result if adverse weather — heavy rains, strong wind or big waves — conditions are present.

We also publish annual high tide flooding reports that present a broad outlook of what to expect for a given year in terms of high tide flooding, as well as a summary of high tide flooding events for the previous calendar year.

Select your region to see when you may experience higher than normal tides that may cause flooding.

The NOAA Coastal Inundation Dashboard provides real-time water levels with forecasts out to 48 hours for all tidal stations.

View an archive of past high tide flooding dates for all regions.

CO-OPS is the NOAA tides and currents office.

Print or save this bulletin as a PDF document.

Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, and New York

Dates:

  • June 22 - June 27, 2021
  • No dates in July
  • No dates in August

Locations:

Tide stations at the following locations have the greatest chance of seeing high tide flooding:

  • Bar Harbor, Maine; Portland, Maine; Boston, Massachusetts; Providence, Rhode Island; Kings Point, New York
  • Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.

Why will they be higher than normal?

  • A perigean spring tide will be occurring in June. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
  • Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • Mean sea level is typically higher in the summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Low lying areas may flood, however high tides alone will likely not cause a significant impact on the coast in most areas unless accompanied by a storm or strong winds.
  • Lower than normal low tides will also occur.

New Jersey, Delaware, Pennsylvania, Maryland, District of Columbia, Virginia

Dates:

  • June 22 - June 27, 2021
  • No dates in July
  • No dates in August

Locations:

Tide stations at the following locations have the greatest chance of seeing high tide flooding:

  • The Battery, New York; Bergen Point, New York; Sandy Hook, New Jersey; Atlantic City, New Jersey; Cape May, New Jersey; Lewes, Delaware
  • Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.

Why will they be higher than normal?

  • A perigean spring tide will be occurring in June. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
  • Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • Mean sea level is typically higher in the summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast will occur, particularly in low-lying areas.
  • If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur.
  • Lower than normal low tides will also occur.

North Carolina, South Carolina, Georgia, Eastern Florida coast

Dates:

  • June 22 - June 27, 2021
  • No dates in July
  • No dates in August

Locations:

Tide stations at the following locations have the greatest chance of seeing high tide flooding:

  • Duck, North Carolina; Myrtle Beach, South Carolina; Charleston, South Carolina; Fort Pulaski, Georgia
  • Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.

Why will they be higher than normal?

  • A perigean spring tide will be occurring in June. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
  • Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • Mean sea level is typically higher in the late Summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast will occur, particularly in low-lying areas.
  • If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur.
  • Lower than normal low tides will also occur.

Texas, Louisiana, Mississippi, Alabama, Western Florida coast

Dates:

  • No dates June - August, 2021

Locations:

  • Texas, Louisiana, Mississippi, Alabama, Western Florida coast.

Why will they be higher than normal?

  • The Gulf Coast will not be significantly impacted.

Why won’t they be impacted?

  • In many locations of the Gulf Coast, the tidal range is relatively small compared to other regions of the U.S, so they will not be as significantly impacted by a perigean spring tide.

California, Oregon, Washington State

Dates:

  • June 22-26, 2021
  • July 21-24, 2021
  • No dates in August

Locations:

Tide stations at the following locations have the greatest chance of seeing high tide flooding:

  • Humboldt Bay, California; Santa Monica, California, San Diego, California
  • Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.

Why will they be higher than normal?

  • A perigean spring tide will be occurring in June. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
  • Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • Mean sea level is typically higher in the late Summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast, in particular in low-lying areas
  • If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur
  • Lower than normal low tides will also occur.

Hawaii, Guam, American Samoa, Midway, Kwajalein, and Wake Island

Dates:

  • June 22-27, 2021
  • No dates in July
  • No dates in August

Locations:

Tide stations at the following locations have the greatest chance of seeing high tide flooding:

  • Hawaii, Guam, American Samoa, Midway, Kwajalein, and Wake Island.
  • Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.

Why will they be higher than normal?

  • A perigean spring tide will be occurring in June. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
  • Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • Mean sea level is typically higher in the late Summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Minor tidal flooding along the coast, in particular in low-lying areas
  • If a storm occurs at this time, increased levels of tidal flooding and coastal erosion may occur
  • Lower than normal low tides will also occur.

Dates:

  • June 23-27, 2021
  • No dates in July
  • No dates in August

Locations:

Tide stations at the following locations have the greatest chance of seeing high tide flooding:

  • Alaska
  • Visit the NOAA Coastal Inundation Dashboard for this region to view real-time water levels with forecasts out to 48 hours.

Why will they be higher than normal?

  • A perigean spring tide will be occurring in June. This is when the moon is either new or full and closest to earth. Higher than normal high tides and lower than normal low tides will occur.
  • Tides will increase leading up to and after the June 21 summer solstice, due to the position of the sun relative to the earth's equator.
  • Mean sea level is typically higher in the late Summer due to changing weather patterns and increasing water temperatures.

What kind of impact might I expect along the coast?

  • Due to the topography, in particular for southeast Alaska (less low lying areas), tidal flooding will generally not have a significant impact on the coast unless there is a severe storm. Lower than normal low tides will also occur.
  • Lower than normal low tides will also occur.
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