Seasonal ranking
Coldest sea temperature in Belgium in September
Where the sea is coolest across Belgium during September, ranked by long-term monthly average water temperature. Knokke-Heist (Flemish Coast, Belgium) is the coolest at around 17°C. Open any spot for today's live water temperature and a 7-day swim forecast.
- 1Knokke-HeistFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 2Ostend BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 3De PanneFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 4De HaanFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 5BlankenbergeFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 6Koksijde BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 7Middelkerke BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 8Nieuwpoort BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 9Wenduine BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 10Bredene BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 11Zeebrugge BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 12Oostduinkerke BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 13Duinbergen BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 14Westende BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
- 15Mariakerke BeachFlemish Coast · Belgium · North SeaCool — shorty wetsuit recommended17°CSeptember average
Coldest sea in September elsewhere
EuropeNorth AmericaSouth AmericaAsiaAfricaOceaniaUnited StatesUnited KingdomAustraliaItalySpainFranceGreeceMexicoPortugalNew ZealandCroatiaCanadaIrelandThailandIndonesiaPhilippinesBrazilSwedenPolandDenmarkNorwayTurkeyNetherlandsGermanyBulgariaJapanCyprusEgyptIndiaSouth AfricaDominican RepublicRomaniaCosta RicaMaltaPuerto RicoBahamasBarbadosSouth KoreaVietnamJamaicaSri LankaUnited Arab EmiratesOmanUS Virgin IslandsAntigua and BarbudaPanamaFinlandMalaysiaCuracaoArgentinaChileColombiaIsraelTanzaniaMoroccoTunisiaTurks and CaicosFijiArubaAlbaniaUruguayPeruMaldivesMauritiusBelizeNicaraguaSaint LuciaCubaMozambiqueFrench PolynesiaBonaireHondurasFrench RivieraAlgarveAmalfi CoastCosta BravaGreek IslandsDalmatian CoastFlorida KeysGreat Barrier Reef CoastCaliforniaFloridaHawaiiNew JerseyNorth CarolinaMassachusettsSouth CarolinaTexasNew YorkPuerto RicoMaineOregonMichiganGeorgiaWashington
Belgium in September — frequently asked questions
- Where is the sea coldest in Belgium in September?
- Knokke-Heist in Belgium has the coldest sea in Belgium in September, averaging about 17.0 °C. Ostend Beach (17.0 °C) and De Panne are the next coolest.
- How many beaches in Belgium are warm enough to swim in September?
- None of the top 15 ranked beaches in Belgium reach 22 °C in September, so a wetsuit is recommended for anything longer than a quick dip.
- How are these September sea temperatures calculated?
- Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.
Explore every sea temperature page
Jump straight to a country, coastal region, city, seasonal ranking or comparison.
Sea temperature by country
Coastal region hubs
Water temperature today by city
Warmest sea in August
Warmest sea month by month (Europe)
Coldest sea this month
Swimming guides
The best time to swim in the MediterraneanWhat sea temperature is safe to swim in?Swimming with kids: the best European beachesHow sea-surface temperature data actually worksWhat sea temperature is good for snorkelling?The best time to swim in SpainThe best time to swim in GreeceThe best time to swim in CroatiaThe best time to swim in FloridaThe best time to swim in CaliforniaThe best time to swim in AustraliaA beginner's guide to cold-water swimmingWarmest European beaches in OctoberFamily beach safety tips for every swimmerWetsuit guide: what to wear by water temperatureThe best time to swim in the CaribbeanThe best time to swim in MexicoThe best time to swim in ThailandThe best time to swim in PortugalThe best time to swim in TurkeyThe best time to swim in EgyptThe best time to swim in FranceThe best time to swim in ItalyBest beaches for snorkelling around the worldBest beaches for surfing by water temperatureHow to survive a rip currentJellyfish and marine life safety for swimmersHow to read a water temperature forecastLake Michigan water temperature: what to expectBest lakes to swim in the United StatesGreat Lakes swimming guideThe best time to swim in HawaiiThe best time to swim in the MaldivesThe best time to swim in Bali
Popular beach comparisons
Cala Estreta vs Platja d'AroCala Estreta vs Cala Sa TunaCala Pola vs Platja de LloretPlatja de Sant Pol vs Platja GranCala Montjoi vs Platja de PalsCala Pola vs Platja de Sant PolCala Estreta vs Platja de PalsAiguablava vs Cala EstretaCambrils Playa vs Platja de la PinedaPlatja de la Pineda vs Platja LlargaPlatja del Miracle vs Salou LevantePlaya del Carabassí vs Playa del PostiguetPlaya de San Juan vs Playa del CarabassíPlaya de la Fossa vs Playa de LevantePlaya de la Fossa vs Playa de PonienteCala Finestrat vs Playa del AlbirCala el Portet vs Playa de la FossaCala del Moraig vs Playa del ArenalCompare any two beaches →
Freshwater swimming
Keep exploring
Live sea temperature mapEvery coast, updated hourlyWarmest beaches todayLive ranking right nowCompare two beachesSide-by-side swim conditionsLake water temperaturesFreshwater swimming spotsRivers & swimming holesWild swimming conditionsAll destinationsBrowse by country & region