Twelvemile C near Petersburg, Alaska water temperature
Twelvemile C near Petersburg, Alaska · River
The current water temperature at Twelvemile C near Petersburg is 11.2 °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 July 22, 2026.
Lowest recorded value: 9.3 °C on September 15, 2026 · highest value: 14.9 °C on August 22, 2026.
In September, temperatures have ranged between 9.3 °C and 12.5 °C.
Nearby waters
Frequently asked questions
Can you swim at Twelvemile C near Petersburg right now?
The current water temperature is 11.2 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Twelvemile C near Petersburg?
Currently 11.2 °C (updated continuously).
How warm is at Twelvemile C near Petersburg in September?
In September, the water temperature recently averaged 11.2 °C.
When is the water warmest at Twelvemile C near Petersburg?
Across the measurement record, July is on average the warmest month (13.4 °C).
