Fullerton Weather in September

September in Fullerton brings very high temperatures, with highs of 31°C (88°F) and nights dropping to 18°C (64°F). Rainfall is very low this month, averaging just 5.3 mm (0.2 in).

Rainfall in Fullerton in September

On average, there are about a single day with rain during this month, averaging 5.3 mm (0.2 in). On the rare occasion it rains, expect a brief, moderate shower rather than a heavy downpour.

Temperature in Fullerton in September

September is a excellent month in Fullerton, with 31°C (88°F) during the day and 18°C (64°F) at night. For most visitors, the main thing to prepare for is the heat during the day. At 18°C (64°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. Bear in mind, these are average temperatures, and it can get even warmer on particular days. Make sure to choose clothing that accommodates the warmth.

Sunshine in Fullerton in September

Expect sunny days throughout the month, with an estimated 290 hours of sunshine. This makes it a pleasant time to visit Fullerton.

September in Fullerton has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.