National C water temperature
National C, Mccarthy, Alaska · River
The current water temperature at National C is 3.9 °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 143 data points since July 23, 2026.
Lowest recorded value: 2.7 °C on September 1, 2026 · highest value: 6.4 °C on August 14, 2026.
In September, temperatures have ranged between 2.7 °C and 5.7 °C.
The current value is 0.4 °C below the September average of this series.
Frequently asked questions
Can you swim at National C right now?
The current water temperature is 3.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at National C?
Currently 3.9 °C (updated continuously).
How warm is at National C in September?
In September, the water temperature recently averaged 4.3 °C.
When is the water warmest at National C?
Across the measurement record, August is on average the warmest month (4.9 °C).
