Lough Allen water temperature
Lough Allen, Blackrock Lock · Lake
The current water temperature at Lough Allen is 17.7 °C (as of September 1, 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 1435 data points since July 3, 2026.
Lowest recorded value: 17.3 °C on August 27, 2026 · highest value: 21.3 °C on July 20, 2026.
In September, temperatures have ranged between 17.6 °C and 17.7 °C.
Nearby waters
Frequently asked questions
Can you swim at Lough Allen right now?
The current water temperature is 17.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Lough Allen?
Currently 17.7 °C (updated continuously).
How warm is at Lough Allen in September?
In September, the water temperature recently averaged 17.7 °C.
When is the water warmest at Lough Allen?
Across the measurement record, July is on average the warmest month (18.9 °C).
