Delaware River water temperature
Delaware River, Frenchtown, New Jersey · River
The current water temperature at Delaware River is 20.4 °C (as of September 21, 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 157 data points since July 23, 2026.
Lowest recorded value: 20.4 °C on September 21, 2026 · highest value: 26.3 °C on August 7, 2026.
In September, temperatures have ranged between 20.4 °C and 24.0 °C.
The current value is 2.2 °C below the September average of this series.
Nearby waters
More measuring points: Delaware River
Frequently asked questions
Can you swim at Delaware River right now?
The current water temperature is 20.4 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Delaware River?
Currently 20.4 °C (updated continuously).
How warm is at Delaware River in September?
In September, the water temperature recently averaged 22.6 °C.
When is the water warmest at Delaware River?
Across the measurement record, July is on average the warmest month (24.2 °C).
