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When To Go · Country Guide

United States of America

Two oceans, a thousand microclimates, and a dive plan for every style

Updated Dec 16, 2025 • 14 sources

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When To Go

Season planner for United States of America

The U.S. is always in season somewhere. Use the calendar to pick a coast, then use local forecasts to pick the exact sites. Florida and Hawaii support year-round diving, but late summer brings the highest hurricane risk in the Atlantic and Gulf. California and the Channel Islands often feel best when swell is low and visibility trends up in late summer and fall. Freshwater springs are the most condition-proof option and can rescue a windy week.

At A Glance Heatmap

ActivityJanFebMarAprMayJunJulAugSepOctNovDec
Overall
Scuba
Freedive
Snorkel
Topside

Activity Drilldowns

PrimeShoulderPlan Carefully
Overall
April - May & September - October·Crowd:Moderate·Cost:Premium
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Ideal: Broad sweet spot: warmer water in Florida, improving visibility in California, and more stable seas on many Hawaiian coasts.

Plan Carefully: Winter surf and storms affect the Pacific, while late summer is peak hurricane vigilance for Atlantic and Gulf regions.

Regional differences matter more than the month.

Scuba
April - June & September - November·Crowd:Moderate·Cost:Premium
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Ideal: More predictable boat days and better averages across Florida, Hawaii, and California; water typically ranges 23°C to 28°C in warm regions.

Plan Carefully: Pacific storms and colder water, plus peak hurricane-season risk in Florida and the Gulf in late summer.

For warmwater reef trips, Florida Keys and Hawaii are the most forgiving.

Freedive
May - September·Crowd:Low·Cost:Premium
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Ideal: Calmer seas and warmer water increase comfort and visibility; winds are often around 25.0 kph or less in morning windows.

Plan Carefully: Winter swell and storms challenge open-ocean training on the Pacific; use sheltered sites or pivot to springs.

Florida springs stay near 22°C yearround and are a reliable backup for breathhold and technique days.

Snorkel
May - September·Crowd:High·Cost:Midrange
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Ideal: Warmer water and calmer seas improve comfort and safety; visibility is often best after multiple calm days.

Plan Carefully: Winter swell and surf make many Pacific entries unsafe; choose sheltered bays and guided boats.

Snorkel safety is mostly about waves.

Topside
May - October for beaches; December - April for Hawaii whale season·Crowd:High·Cost:Premium
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Ideal: Beach and boat conditions are generally friendlier, with warm air and longer days across most coasts.

Plan Carefully: Winter storms, bigger surf, and shorter days on many coasts; Hawaii remains strong for whale watching with smart shoreline choice.

If your main goal is ocean wildlife, winter is a feature, not a bug: Hawaii humpback whales peak in winter months, but surf can dictate where you go.

Seasonal Callouts Timeline

  • Humpback whales in Hawaii

    JanJan
    FebFeb
    MarMar
    AprApr
    MayMay
    JunJun
    JulJul
    AugAug
    SepSep
    OctOct
    NovNov
    DecDec

    Peak whale season around the Hawaiian Islands. You may hear songs underwater, but keep legal viewing distances and never chase whales.

  • Florida manatees in springs and warm-water refuges

    JanJan
    FebFeb
    MarMar
    AprApr
    MayMay
    JunJun
    JulJul
    AugAug
    SepSep
    OctOct
    NovNov
    DecDec

    Cooler months increase manatee encounters in select Florida waters. Follow local rules, move slowly, and never touch or block their path.

  • Sea turtle nesting season (Atlantic and Gulf beaches)

    JanJan
    FebFeb
    MarMar
    AprApr
    MayMay
    JunJun
    JulJul
    AugAug
    SepSep
    OctOct
    NovNov
    DecDec

    Nesting and hatchling season varies by beach. Keep lights low at night and follow posted closures and wildlife guidance.

  • Goliath grouper aggregation (South Florida wrecks)

    JanJan
    FebFeb
    MarMar
    AprApr
    MayMay
    JunJun
    JulJul
    AugAug
    SepSep
    OctOct
    NovNov
    DecDec

    Late summer can bring famous aggregations on select wrecks and ledges in South Florida. Visibility and surge vary with weather.

  • California gray whale migration viewing

    JanJan
    FebFeb
    MarMar
    AprApr
    MayMay
    JunJun
    JulJul
    AugAug
    SepSep
    OctOct
    NovNov
    DecDec

    Winter and early spring support coastal whale watching along California, especially from headlands and boat trips.

  • Kona manta night dives (Hawaii Island)

    JanJan
    FebFeb
    MarMar
    AprApr
    MayMay
    JunJun
    JulJul
    AugAug
    SepSep
    OctOct
    NovNov
    DecDec

    Manta experiences can run year-round, but conditions and site selection depend on swell and operator planning.