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 perfect 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.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Fullerton's climate page.

Fullerton Temperature in September

Min Temperature 18°C (64°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 3%  

Precipitation 5.3 mm (0.2 in)  

Rainy days a single day  

Sunshine 290 hours *  

Percentage Sunshine *  

* Data from: Corona, the United States of America (33 KM, 20 Miles).

What to Wear in Fullerton in September

Warm but pleasant conditions in Fullerton in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Dry conditions mean you won't need to worry about rain protection. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Fullerton in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Fullerton's climate page.

More climate data for Fullerton

Temperature Rainfall Sunshine

See the full Fullerton climate overview or explore weather in the United States of America.