Trinity River above Nf Trinity River near Helena, California water temperature
Trinity River above Nf Trinity River near Helena, California · River
The current water temperature at Trinity River above Nf Trinity River near Helena is 12.6 °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 164 data points since July 22, 2026.
Lowest recorded value: 11.5 °C on September 4, 2026 · highest value: 20.5 °C on July 27, 2026.
In September, temperatures have ranged between 11.5 °C and 14.9 °C.
The current value is 0.4 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Trinity River above Nf Trinity River near Helena 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 Trinity River above Nf Trinity River near Helena?
Currently 12.6 °C (updated continuously).
How warm is at Trinity River above Nf Trinity River near Helena in September?
In September, the water temperature recently averaged 13.0 °C.
When is the water warmest at Trinity River above Nf Trinity River near Helena?
Across the measurement record, July is on average the warmest month (18.9 °C).
