Portage River water temperature
Portage River, Fifth Avenue at Three Rivers, Michigan · River
The current water temperature at Portage River is 17.9 °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 334 data points since July 23, 2026.
Lowest recorded value: 17.7 °C on September 21, 2026 · highest value: 26.8 °C on September 3, 2026.
In September, temperatures have ranged between 17.7 °C and 26.8 °C.
The current value is 5.0 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Portage River right now?
The current water temperature is 17.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Portage River?
Currently 17.9 °C (updated continuously).
How warm is at Portage River in September?
In September, the water temperature recently averaged 22.9 °C.
When is the water warmest at Portage River?
Across the measurement record, September is on average the warmest month (22.9 °C).
