Upper Klamath Lake water temperature
Upper Klamath Lake, Howard Bay, Oregon · Lake
The current water temperature at Upper Klamath Lake is 17.0 °C (as of September 23, 2026, source: USGS).
Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.
Measurement series & statistics
This measurement series includes 59 data points since July 27, 2026.
Lowest recorded value: 14.5 °C on September 4, 2026 · highest value: 24.2 °C on August 7, 2026.
In September, temperatures have ranged between 14.5 °C and 19.2 °C.
The current value is 0.7 °C above the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at Upper Klamath Lake right now?
The current water temperature is 17.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Upper Klamath Lake?
Currently 17.0 °C (updated continuously).
How warm is at Upper Klamath Lake in September?
In September, the water temperature recently averaged 16.3 °C.
When is the water warmest at Upper Klamath Lake?
Across the measurement record, July is on average the warmest month (22.9 °C).
