Allagash River water temperature
Allagash River, Allagash, Maine · River
The current water temperature at Allagash River is 12.6 °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 438 data points since July 23, 2026.
Lowest recorded value: 12.6 °C on September 21, 2026 · highest value: 29.2 °C on August 7, 2026.
In September, temperatures have ranged between 12.6 °C and 22.7 °C.
The current value is 5.5 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Allagash River right now?
The current water temperature is 12.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Allagash River?
Currently 12.6 °C (updated continuously).
How warm is at Allagash River in September?
In September, the water temperature recently averaged 18.1 °C.
When is the water warmest at Allagash River?
Across the measurement record, August is on average the warmest month (22.5 °C).
