Lakes, measured at the lake.
Fort Buchanan in United States measures 29.0 °C, Viertjern in Norway 2.5. Lakes warm and cool slower than the air, which is why guessed values miss by several degrees. Everything here is measured by an official station, no model in sight.
7 lakes you know, measured today
Where lakes get measured
Still summer
Fort BuchananUnited States29.0 °CHévíz tóközépHungary28.3 °CCwa Canal InflowUnited States28.3 °CHoustonUnited States27.9 °CJack's Ditch (Site 2)United States27.8 °CFM 1960United States27.7 °CHackberryUnited States27.5 °CCypremort PointUnited States27.0 °CCaillou Lake (Sister Lake) Sw of DulacUnited States26.6 °CWhiskey Canal S of WaggamanUnited States26.4 °CMeasured at the lake, with the time
USGS and NOAA on the American lakes, the Austrian and Bavarian hydrographic services on the alpine lakes, NVE in Norway, the Polish, Finnish and Irish agencies on theirs: official stations, most of them reporting hourly or every quarter hour. Bathing-water networks add a sampled value every few weeks with its date. BrrChecker reads all of them and shows when each value was taken. Model lakes, such as our Alplakes points, stay off this page.
Lakes stratify. The station reads the surface, and one metre down it can be three degrees cooler; a shallow bay can be three degrees warmer than the buoy. The measured surface value is the honest reference, not a promise for every corner of the lake.
1317 lakes with their own page
Every measured water has a page with all stations, trend and neighbours. The 30 with the most stations:
Why do lakes stay warm into September?
Thermal inertia: a lake stores an entire summer of heat. That is why early autumn often offers the best swimming — cool air, warm water. Right now the warmest measured lake in our network is Fort Buchanan at 29.0 °C.
Why does my lake feel different from the forecast?
Because forecasts model air, not water — and lakes stratify: the surface can be several degrees warmer than one meter below. Measured surface values are the honest reference.
Which lakes are measured?
Thousands — from alpine lakes to the Great Lakes, via official buoys, agency networks and vetted monitoring programs in 80 countries.
Check the lake, then jump.
Every measured lake with history, BrrScore and alerts, free in the app.
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