Spring
-
Temperatures in the 70s°F (21-26°C) from March through May offer pleasant conditions for RV camping in Fontana.
-
The iconic Acura Grand Prix of Long Beach, one of the premier IndyCar races, takes place in April, about 50 miles (80 km) from Fontana.
Fall
-
Average highs of 75-85°F (24-29°C) from September through November make for ideal hiking and biking weather in the San Gabriel Mountains, just north of Fontana.
-
The annual Fontana Arts Festival in September features over 200 local artists, live entertainment on multiple stages, and a diverse array of food trucks.