If you planning to travel to Fullerton, CA, United States (FUL-Fullerton Municipal), here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 1:39 PM. The temperature feels like 67.3 with a humidity level of 74 so dress accordingly. Cloud coverage is 54 percent with visibility at 14.5 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling southwest at a speed of 8 MPH. At the end of the day don’t miss the sunset at 1:50 AM.