Delaware River at Fort Mifflin at Philadelphia, Pennsylvania water temperature
Delaware River at Fort Mifflin at Philadelphia, Pennsylvania · River
The current water temperature at Delaware River at Fort Mifflin at Philadelphia is 24.6 °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 160 data points since July 22, 2026.
Lowest recorded value: 24.6 °C on September 20, 2026 · highest value: 27.7 °C on August 9, 2026.
In September, temperatures have ranged between 24.6 °C and 26.3 °C.
The current value is 1.0 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Delaware River at Fort Mifflin at Philadelphia right now?
The current water temperature is 24.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Delaware River at Fort Mifflin at Philadelphia?
Currently 24.6 °C (updated continuously).
How warm is at Delaware River at Fort Mifflin at Philadelphia in September?
In September, the water temperature recently averaged 25.6 °C.
When is the water warmest at Delaware River at Fort Mifflin at Philadelphia?
Across the measurement record, July is on average the warmest month (27.1 °C).
