Ionian Sea water temperature
Ionian Sea, Ithaca · Sea/Coast
The current water temperature at Ionian Sea is 27.9 °C (as of September 20, 2026, source: Open-Meteo marine model).
The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.
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Measurement series & statistics
This measurement series includes 609 data points since July 22, 2026.
Lowest recorded value: 27.5 °C on July 27, 2026 · highest value: 30.3 °C on July 22, 2026.
In September, temperatures have ranged between 27.7 °C and 29.9 °C.
The current value is 1.0 °C below the September average of this series.
Nearby waters
More measuring points: Ionian Sea
Frequently asked questions
Can you swim at Ionian Sea right now?
The current water temperature is 27.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Ionian Sea?
Currently 27.9 °C (updated continuously).
How warm is at Ionian Sea in September?
In September, the water temperature recently averaged 28.9 °C.
When is the water warmest at Ionian Sea?
Across the measurement record, September is on average the warmest month (28.9 °C).
