Delaware River at Marcus Hook, Pennsylvania water temperature
Delaware River at Marcus Hook, Pennsylvania · River
The current water temperature at Delaware River at Marcus Hook is 24.5 °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 93 data points since August 28, 2026.
Lowest recorded value: 23.6 °C on August 28, 2026 · highest value: 27.7 °C on September 4, 2026.
In September, temperatures have ranged between 24.3 °C and 27.7 °C.
The current value is 1.3 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Delaware River at Marcus Hook right now?
The current water temperature is 24.5 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Delaware River at Marcus Hook?
Currently 24.5 °C (updated continuously).
How warm is at Delaware River at Marcus Hook in September?
In September, the water temperature recently averaged 25.8 °C.
