Atlantic water temperature

Atlantic, Key West, FL · Sea/Coast

The current water temperature at Atlantic is 30.8 °C (as of September 20, 2026, source: NOAA NDBC).

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

30.8 °C

Measured: September 20, 2026 · continuously updated

💧 Water 30.8° · ☀️ Air 26.4° · high today 29.7°

Temperature trend of recent weeks

Atlantic — Photo: Florida Memory · Public domain · Wikimedia Commons

Water quality

Official EPA rating: excellent

Measurement series & statistics

This measurement series includes 155 data points since August 21, 2026.

Lowest recorded value: 30.7 °C on September 19, 2026 · highest value: 33.3 °C on September 4, 2026.

In September, temperatures have ranged between 30.7 °C and 33.3 °C.

The current value is 1.3 °C below the September average of this series.

Nearby waters

Atlantic, Key West · 0.0 km away30.7 °C Gulf of Mexico, Key West / Smathers Beach · 3.2 km away30.8 °C Atlantic, Satan Shoal, FL (244) · 23.2 km away30.9 °C Atlantic, Vaca Key, FL · 72.9 km away30.2 °C Atlantic, Vaca Key, Florida Bay · 73.0 km away30.0 °C

More measuring points: Atlantic

South Port Everglades35.4 °C Trident Pier, Port Canaveral32.9 °C Taylor River, FL31.4 °C Garfield Bight, FL31.2 °C Johnson Key, FL31.0 °C Satan Shoal, FL (244)30.9 °C

Frequently asked questions

Can you swim at Atlantic right now?
The current water temperature is 30.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Atlantic?
Currently 30.8 °C (updated continuously).

How warm is at Atlantic in September?
In September, the water temperature recently averaged 32.1 °C.

How is the water quality at Atlantic?
The official classification is: excellent.

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