Catalina Island In September

As summer winds down, September brings warm early autumn weather and the last days of Catalina’s peak visitor season. This captivating destination offers a perfect blend of tranquility and adventure, making it an attractive escape for those seeking a memorable getaway in early fall.

Let’s look at everything you need to know about visiting Catalina Island in September, including average temperatures, rainfall, water temperature, wind, and humidity.  

September Weather On Catalina Island

September transitions Catalina into autumn while still clinging to summer with warm, sunny weather and minimal rainfall. Daytime highs average in the upper 70s°F while cooler lows near 60°F make for comfortable sleeping. Precipitation is unlikely but possible.

September offers a great shoulder season to visit Catalina with fewer tourists, lower rates, and ideal weather to indulge in Catalina’s iconic outdoor offerings like kayaking, hiking, swimming, fishing, and snorkeling before crowds dissipate.

Average Temperature On Catalina Island In September

The average temperature on Catalina Island in September is 72°F (22.2°C), with highs that reach 79°F (26.1°C) and average overnight lows falling to around 66°F(18.8°C). However, Catalina’s array of microclimates leads to temperature variations across Avalon, Two Harbors, and inland.

Pack lightweight layers like shorts, tanks, tees, pants, hoodies, and jackets to adapt to cooling autumn weather. Swimwear for beach days plus a light cover-up are recommended. Hats, sunglasses, and sandals will also come in handy when enjoying Catalina’s sunny shores.

How Sunny Is It On Catalina Island In September?

September brings ample sunshine to Catalina, with an average of 278 bright sunny hours over the course of the month as the autumn equinox arrives. On average, the island enjoys 12.3 hours of daily daylight, with the occasional marine fog layer possible.

The extensive sunny weather means great beach and hiking conditions prevail. Be diligent about reapplying water-resistant SPF30+ sunscreen when enjoying outdoor activities, as UV exposure remains high in September. Seeking some shade around midday is wise to avoid burns.

Does It Rain In September?

While Catalina’s dry season continues into September, there is a slight uptick in precipitation chances as the autumn rainy period approaches. There is a 0-3% average chance of rain on any given September day. Around 0.1-0.8 inches of precipitation may occur over the month.

Packaging weather protection like a thin rain jacket or umbrella is prudent in case of passing showers. But most days stay dry, making spontaneous activities like boating or swimming feasible. Any rainfall is usually brief.

How Humid Is Catalina Island In September?

As an island transitioning into fall, Catalina still sees occasional humidity in September, although it declines from summer peaks. Average humidity measures around 70%, with mugginess comfort ratings dropping to 1-2%.

The refreshing ocean breeze helps provide relief from any sticky weather. Seeking shade and air-conditioned interludes allow recuperation from heat spells when exploring Catalina’s sights and coastal trails. Staying hydrated is key to counteracting humidity.

How Windy Is Catalina Island In September?

September winds on Catalina begin to pick up slightly from summer lows. Average wind speeds measure around 7.2 miles per hour, coming in gentle to moderate ocean breezes. Gusts very rarely reach disruptive levels.

The winds help keep conditions comfortable on warm September days. But sudden gusts may arise, so secure hats and loose items on blustery days. Seek protected coves if winds kick up while boating or enjoying other water recreation. Mostly, the winds deter insects from Catalina’s lush flora.

Is The Water Warm In September?

While slowly cooling down as autumn arrives, the ocean temperature off Catalina Island remains warm in September. Average sea surface temperatures measure around 68°F, ideal for swimming and water fun.

These balmy ocean conditions allow for lingering beach days, snorkeling, kayaking, stand-up paddling, and other aquatic adventures without the need for a wetsuit for most. Visibility underwater remains excellent for viewing dazzling marine life.

Still have questions? Check out these answers to some commonly asked questions. 

Is September a good time to visit Catalina Island?

Yes, September is an excellent time to visit Catalina! The weather still feels like summer with warm temps but smaller crowds. Hotel rates also drop from peak summertime highs, making travel more affordable.

Is September a rainy month in California?

September starts California’s autumn rainy period, but Catalina Island stays relatively dry. Rain is unlikely but possible, with a 1-3% average chance of precipitation and only brief passing showers occurring occasionally.

What should I wear to Catalina Island?

September daytime weather calls for lightweight layers like shorts, t-shirts, tanks, and pants and a light sweater or jacket for evenings. Pack swimwear, sun protection, and sandals to enjoy the beach.

Do you get seasick going to Catalina Island?

It’s possible if prone to motion sickness, though most do fine on the hour ferry ride. To prevent seasickness, take medication beforehand, stare at the horizon, and stay on the upper deck for fresh air. Avoid down below.

Are there orcas on Catalina Island?

Yes, Catalina does get occasional orca sightings, though they are less common than in other parts of the California coastline. Dolphins and migrating whales like gray, blue, and humpback whales are more frequently seen off Catalina.

Can you walk everywhere in Catalina?

The town of Avalon is very walkable, but visiting beaches further from downtown or exploring the backcountry would require other transportation, such as shuttles, tours, or bicycles. Golf carts are also popular for getting around Avalon.

What is the best month to visit Catalina Island?

The shoulder seasons of May, June, September, and October are ideal with sunny skies, moderate temperatures around 70°F and smaller tourist crowds. July-August brings heat, humidity, and greater numbers.

What currency is used in Catalina Island?

The US dollar is the official currency used throughout Catalina Island. Cash is more widely accepted than credit cards at smaller shops, so carrying bills is recommended. ATMs are available in Avalon for cash withdrawal.