Kattegat water temperature

Kattegat, Onsala · Sea/Coast

The current water temperature at Kattegat is 17.6 °C (as of September 1, 2026, source: official monitoring networks).

The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.

17.6 °C

Measured: September 1, 2026 · continuously updated

💧 Water 17.6° · ☀️ Air 16.5° · high today 18.7°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 671 data points since July 3, 2026.

Lowest recorded value: 16.8 °C on July 28, 2026 · highest value: 22.1 °C on July 16, 2026.

In September, temperatures have ranged between 17.6 °C and 17.7 °C.

Nearby waters

Kattegat, Smarholmen · 4.2 km away18.0 °C Kattegat, Gottskär - Utholmen · 6.5 km away18.0 °C Kattegat, Lerkil · 7.3 km away18.0 °C Kattegat, Gårda brygga - Hamn · 10.3 km away17.0 °C Kattegat, Vallda Sandö - Stensvik · 10.7 km away18.0 °C

More measuring points: Kattegat

Arild, Kallbadhuset20.0 °C Farhultsbaden20.0 °C Hönö, Hästen20.0 °C Hönö, Lapposand20.0 °C Laholmsbukten, Birger Pers väg20.0 °C Laholmsbukten, Fiskaregatan20.0 °C

Frequently asked questions

Can you swim at Kattegat 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 Kattegat?
Currently 17.6 °C (updated continuously).

How warm is at Kattegat in September?
In September, the water temperature recently averaged 17.6 °C.

When is the water warmest at Kattegat?
Across the measurement record, July is on average the warmest month (19.1 °C).

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