Derwentwater water temperature
Derwentwater, Keswick · Lake
The current water temperature at Derwentwater is 17.6 °C (as of September 7, 2026, source: official monitoring networks).
Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.
Measurement series & statistics
This measurement series includes 9 data points since July 23, 2026.
Lowest recorded value: 16.8 °C on September 6, 2026 · highest value: 21.5 °C on August 11, 2026.
In September, temperatures have ranged between 16.8 °C and 17.6 °C.
The current value is 0.5 °C above the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Derwentwater right now?
The current water temperature is 17.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Derwentwater?
Currently 17.6 °C (updated continuously).
How warm is at Derwentwater in September?
In September, the water temperature recently averaged 17.1 °C.
