Nissequogue River at Landing Ave at Smithtown, New York water temperature
Nissequogue River at Landing Ave at Smithtown, New York · River
The current water temperature at Nissequogue River at Landing Ave at Smithtown is 15.3 °C (as of September 20, 2026, source: USGS).
A river can change temperature within hours — snowmelt, rain or power-plant operations show up immediately. That is why the measured value counts here, not an estimate.
Measurement series & statistics
This measurement series includes 175 data points since August 12, 2026.
Lowest recorded value: 14.4 °C on September 8, 2026 · highest value: 27.0 °C on September 4, 2026.
In September, temperatures have ranged between 14.4 °C and 27.0 °C.
The current value is 4.2 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Nissequogue River at Landing Ave at Smithtown right now?
The current water temperature is 15.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Nissequogue River at Landing Ave at Smithtown?
Currently 15.3 °C (updated continuously).
How warm is at Nissequogue River at Landing Ave at Smithtown in September?
In September, the water temperature recently averaged 19.5 °C.
