Deer Creek Reservoir Fishing Report
The only way to know the actual August surface temp on your specific date is to measure it on site with your electronics or a thermometer.
August water temperature at Deer Creek Reservoir: The historical series shows an average of 74.8°F, with readings ranging from 69.7°F to 84.0°F across 7 recorded August measurements. The trend is cooling through the month (Δ -13.0°F over those readings).
What that means for your trip: That range puts the surface temperature well inside the reference range for largemouth bass (60–75°F) and near the upper edge for rainbow and brown trout (45–65°F). This is temperature context only—it does not prove feeding, depth, or location. The only way to know the actual August surface temp on your specific date is to measure it on site with your electronics or a thermometer.