Weather for Rattlesnake Reservoir, CA - Rattlesnake Reservoir, CA Weather, Current Weather in Rattlesnake Reservoir, CA. Local weather report for Rattlesnake Reservoir, CA, Local Rattlesnake Reservoir, CA weather. Forecast for Rattlesnake Reservoir, California, Rattlesnake Reservoir, CA weather forecast. Find your local Rattlesnake Reservoir weather forecast. Rattlesnake Reservoir, CA weather conditions.