Grimsvatn water temperature
Grimsvatn · Lake
The current water temperature at Grimsvatn is 8.5 °C (as of September 20, 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 726 data points since July 22, 2026.
Lowest recorded value: 8.5 °C on September 20, 2026 · highest value: 19.0 °C on July 22, 2026.
In September, temperatures have ranged between 8.5 °C and 13.6 °C.
The current value is 2.6 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Grimsvatn right now?
The current water temperature is 8.5 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Grimsvatn?
Currently 8.5 °C (updated continuously).
How warm is at Grimsvatn in September?
In September, the water temperature recently averaged 11.1 °C.
When is the water warmest at Grimsvatn?
Across the measurement record, July is on average the warmest month (13.7 °C).
