Peconic River water temperature
Peconic River, County HWY 105 at Riverhead, New York · Sea/Coast
The current water temperature at Peconic River is 22.2 °C (as of September 21, 2026, source: USGS).
The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.
Measurement series & statistics
This measurement series includes 425 data points since July 23, 2026.
Lowest recorded value: 22.2 °C on September 21, 2026 · highest value: 29.2 °C on August 10, 2026.
In September, temperatures have ranged between 22.2 °C and 26.0 °C.
The current value is 2.6 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Peconic River right now?
The current water temperature is 22.2 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Peconic River?
Currently 22.2 °C (updated continuously).
How warm is at Peconic River in September?
In September, the water temperature recently averaged 24.8 °C.
When is the water warmest at Peconic River?
Across the measurement record, August is on average the warmest month (26.8 °C).
