Weather for Fairmont Knolls Park, CA - Fairmont Knolls Park, CA Weather, Current Weather in Fairmont Knolls Park, CA. Local weather report for Fairmont Knolls Park, CA, Local Fairmont Knolls Park, CA weather. Forecast for Fairmont Knolls Park, California, Fairmont Knolls Park, CA weather forecast. Find your local Fairmont Knolls Park weather forecast. Fairmont Knolls Park, CA weather conditions.