Norwalk Harbor water temperature

Norwalk Harbor, Marvin Beach · Sea/Coast

The current water temperature at Norwalk Harbor is 21.0 °C (as of September 21, 2026, source: USGS · Proxy).

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

21.0 °C

Measured: September 21, 2026 · continuously updated

💧 Water 21.0° · ☀️ Air 16.4° · high today 21.0°

Temperature trend of recent weeks

Water quality

Official EPA rating: good

Measurement series & statistics

This measurement series includes 99 data points since August 26, 2026.

Lowest recorded value: 21.0 °C on September 21, 2026 · highest value: 24.6 °C on September 4, 2026.

In September, temperatures have ranged between 21.0 °C and 24.6 °C.

The current value is 2.5 °C below the September average of this series.

Nearby waters

Norwalk Harbor, the Cove Marina near E Norwalk, Connecticut · 0.7 km away21.0 °C Norwalk Harbor, Calf Pasture Beach · 0.9 km away21.0 °C Norwalk Harbor, Harbor View Beach · 1.2 km away21.0 °C Norwalk River, Maritime Aquarium near S Norwalk, Connecticut · 1.8 km away21.6 °C Norwalk Harbor, Long Beach · 2.0 km away21.0 °C

More measuring points: Norwalk Harbor

Calf Pasture Beach21.0 °C Harbor View Beach21.0 °C Long Beach21.0 °C the Cove Marina near E Norwalk, Connecticut21.0 °C

Frequently asked questions

Can you swim at Norwalk Harbor right now?
The current water temperature is 21.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Norwalk Harbor?
Currently 21.0 °C (updated continuously).

How warm is at Norwalk Harbor in September?
In September, the water temperature recently averaged 23.5 °C.

How is the water quality at Norwalk Harbor?
The official classification is: good.

← All waters · Warmest beaches & coasts today · Water temperature in United States