Isefjord water temperature
Isefjord, Holbæk Havn · Sea/Coast
The current water temperature at Isefjord is 16.8 °C (as of September 12, 2026, source: DMI).
The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.
Water quality
EU classification: excellentMeasurement series & statistics
This measurement series includes 1260 data points since July 20, 2026.
Lowest recorded value: 15.4 °C on September 6, 2026 · highest value: 22.2 °C on August 5, 2026.
In September, temperatures have ranged between 15.4 °C and 19.2 °C.
The current value is 0.8 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Isefjord right now?
The current water temperature is 16.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Isefjord?
Currently 16.8 °C (updated continuously).
How warm is at Isefjord in September?
In September, the water temperature recently averaged 17.6 °C.
When is the water warmest at Isefjord?
Across the measurement record, July is on average the warmest month (19.9 °C).
How is the water quality at Isefjord?
The official classification is: excellent.
