Clear water in the Rhine near Ellikon, with floodplain forest and hills in the background Rhine near Ellikon · Photo © BrrChecker

The Water Temperature App

Check first, then swim.

Water temperatures from over 13,800 measuring points in 80 countries – lake, river, lido and sea. Every value with the time it was measured, model values clearly labelled.

Download on the App Store Free on iPhone. Pro $4.99 a year.
17.8°Rhine, Rheinaumeasured
Favourites with water temperatures
Detail page with reading and history
BrrScore: how the number is calculated

Just measured

Local time at the measuring point · Scale 0 to 32 °C
Rhône, Oberwald5.4°
Gulf of Bothnia, Luleå6.2°
Eisbach, Munich14.3°
Rhine, Rheinau17.8°
Atlantic, Key West30.2°

Everything in one app

Measured, with a timestamp.

The values come from official and open monitoring networks – thermometers in the water, buoys and official samples, each with the time it was measured. Where a lake or sea model calculates the value, the app clearly labels it as a model.

BrrScore · 7 sports

Your swim day in a single number.

Water temperature, weather, wind and waves, distilled into one honest number from 1 to 10 – calculated separately for each sport. Tap to see how it's calculated.

8Swimming 7SUP 6Kayak 3Surfing 5Windsurfing 4Kitesurfing 6Pump foiling

Swimming free · all other activities with Pro

BrrScore explanation in the app

The network

Lakes, rivers, lidos and the sea in one search.

13,800+
measuring points
80
countries
75
sources
BAFUPegelOnlineNOAAUSGSEnvironment AgencyISPRASMHIRijkswaterstaatEEA+66 more sources

Tides on the coastPRO

Low and high tide for coastal spots, alongside the water temperature.

Tide curve in the app

On your wristPRO

Water temperature and BrrScore right on your Apple Watch.

Watch app with water temperature and BrrScore

Safety first. Always free.FREE

Where authorities issue a blue-green algae warning or a storm threatens, BrrScore automatically caps the number. You see a swim ban right away.

Detail page with an official warning

Search and discover

Search by body of water or place, filter by BrrScore – warmest first.

Search free · Discover filter PRO

Search with BrrScore filter

Wind for surf & kitePRO

Knots, gusts, onshore or offshore – plus the best window of the next 48 hours at coastal spots.

Wind forecast in the app

BrrCommunity – measuring togetherFREE

Your Apple Watch measures the water temperature while you swim. Share it and your reading appears anonymously at the bathing spot – right where official samples come only every few weeks.

Anonymous · can be switched off · Apple Watch Ultra, Series 10 or newer

Contributing readings: explainer screen in the app
BrrLog on the Apple Watch, with the Rhine in the background

BrrLog · Apple Watch PRO

Every session on your wrist.

Photo © BrrChecker

Fair & honest · Launch price – yours forever

Use it free. Go Pro when you want more.

Free $0forever
  • Current water temperatures worldwide
  • Search
  • 7-day history
  • BrrScore for swimming
  • Rain radar (short-term forecast)
  • 2 favourites
  • Severe weather warnings
  • Water level rating – low, normal, high
  • Sharing with image and measurement time
Download on the App Store

Pricing varies by country and currency (UK: £3.99/year) – your App Store price applies. Free stays free – forever. Cancel Pro anytime in your App Store settings. Your launch price never goes up.

Press

What people are saying

What the media write about BrrChecker.

With the support of the CDMO, a small company turned NERRS SWMP’s high-quality public data into something useful for people who will never open a data portal.

NERRA · Rebecca Roth, Executive Director · 2026-10-12 · Read the article →

Findige Entwickler können nach wie vor Nischen finden, und diese mit professionell gemachten mobilen Apps besetzen. Der BrrChecker ist genau eine solche App.

appgamers.de · 2026-07-30 · Read the article →

Es gibt ja Apps, die erfüllen genau einen Zweck. BrrChecker ist so eine App.

appgefahren.de · 2026-07-20 · Read the article →

To the press kit →

Questions

Frequently asked

Where do the water temperatures come from?

From 75 official and open sources across 80 countries: BAFU (CH), Kanton St. Gallen (CH), wiewarm.ch (CH), IGKB (Bodensee), GKD Bayern (DE), PEGELONLINE (DE), LANUV NRW (DE), Wasserportal Berlin (DE), Badegewässerkarte Sachsen-Anhalt / LAV (DE), Badegewässer Schleswig-Holstein / Open Data SH (DE), Badegewässer-Atlas Rheinland-Pfalz / LfU, ODGRP (DE), Badegewässer Hamburg / BUE-BUKEA (DE), Badestellen Berlin / LAGeSo (DE), Badestellen Brandenburg / LAVG (DE), Badegewässer NRW / LANUK (DE), Badewasserkarte M-V / LAGuS (DE), SAICA / Confederaciones Hidrográficas (ES), SOCIB — Balearic Islands Coastal Observing and Forecasting System (ES), NLWKN Gewässergüte / pegelonline.nlwkn.niedersachsen.de (DE), DMI oceanObs (DK), Cefas WaveNet (GB), Channel Coastal Observatory (GB), Environment Agency Hydrology (GB), DAERA/NIEA Lough Neagh (GB), Water Survey of Canada (ECCC), ECCC Messbojen (CA), SmartAtlantic Alliance (CA), City of Toronto — Beaches Observations (CA), OSM-Strände Kanada (Wert der nächsten Station ≤2 km), OSM-Strände Großbritannien (Wert der nächsten CCO-Boje ≤2 km), EPA-Badestellen Irland (Wert der Irish-Lights-Boje derselben Bucht ≤10 km), Queensland Coastal Data System (AU), Bureau of Meteorology – Water Data Online (AU), Queensland Water Monitoring Information Portal (AU), AIMS Weather Stations (AU), IMOS Australian Ocean Data Network – Moorings (AU), ČHMÚ Open Data (CZ), ISPRA — Rete Mareografica Nazionale (IT), LfU Rheinland-Pfalz — Gewässerüberwachungsstationen (DE), Gesundheitsreferat der Landeshauptstadt München (DE), Instituto Hidrográfico (PT), Copernicus Marine In Situ (FR/PT/ES), Eawag Datalakes – Messsonden Luganersee/Maggiore (CH), Università degli Studi di Brescia – gruppo di Idraulica - Trentapassi (IT), ARPA Lombardia – Seepegel lombardische Seen (IT), Agentur für Bevölkerungsschutz Südtirol (IT), AGES (AT), Hydrographie Kärnten/OÖ/Salzburg/Tirol/NÖ/Vorarlberg (AT), Hydrographischer Dienst Burgenland (AT), Rijkswaterstaat (NL), IMGW (PL), ARSO (SI), Hub'Eau (FR), USGS (US), OVF / vizugy.hu (HU), SYKE (FI), SMHI + HaV Badplatsen (SE), Environment Agency (GB), OPW / waterlevel.ie (IE), Commissioners of Irish Lights MetOcean (IE/GB), NVE HydAPI (NO), NOAA NDBC (US), Great Lakes Observing System (US), NOAA CO-OPS (US), Ministère chargé de la Santé / Atlasanté (FR, Licence Ouverte), Eawag/Alplakes lake models, the Open-Meteo marine model, DHMZ (meteo.hr), IZOR (vrtlac.izor.hr), NZ Regional Councils (Hilltop), Chicago Park District — Beach Water Sensors (US), PacIOOS — Pacific Islands Ocean Observing System (US), NOAA NERRS SWMP — National Estuarine Research Reserve System (US) and US beaches — nearest official sensor (NOAA NDBC/CO-OPS/NERRS, USGS, GLOS, Chicago). Water quality comes from the EEA.

What does BrrChecker cost?

New: you can try Pro free for 7 days first – the yearly subscription only starts afterwards and can be cancelled anytime. BrrChecker is free to use: current water temperatures worldwide, search, 7-day history, BrrScore for swimming, rain radar, severe weather warnings, water level rating and sharing. BrrChecker Pro ($4.99 per year – about 40 cents a month) unlocks unlimited favorites, full history, all sports, the surroundings map, coastal tides, water level history, on-site impressions, widget, Apple Watch, alerts and water quality. Cancel anytime in your App Store settings. The $4.99/year launch price stays yours for as long as you subscribe – future increases only affect new customers. With Apple Family Sharing, one subscription covers the whole family.

Which regions are covered?

Over 13,800 measuring points in 80 countries: lakes, rivers and bathing spots across Europe, Mediterranean and Atlantic coasts, the Caribbean, North America's Great Lakes and popular beaches worldwide – from the Algarve to Thailand. The network is currently densest in the Alps and the Netherlands, and it keeps growing.

Does the widget work offline?

The widget shows the last loaded values and refreshes automatically in the background once you're back online.

What does BrrChecker show for lakes, rivers and the sea?

BrrChecker shows measured water temperatures from over 13,800 official stations worldwide – lakes, rivers, lidos and beaches – each with the time it was taken, free on the App Store, no account needed.

Is there BrrChecker for Apple Watch?

Yes. The watch app shows favourites, water temperature and BrrScore on your wrist. With an Apple Watch Ultra or Series 10 the watch measures along while you swim and shares the value anonymously with everyone looking at the same spot.

Ready for your next swim?

Get BrrChecker and find out if your favourite spot is calling today.

Download on the App Store
Rhine near Ellikon · Photo © BrrChecker