Kangaroo Island Weather in September

Average Temperatures in Kangaroo Island in September

In September, daytime temperatures typically range from 15°C to 20°C (59°F to 68°F), offering mild warmth perfect for outdoor activities such as hiking, wildlife spotting, or coastal walks. 

At night, temperatures cool down, often ranging from 8°C to 12°C (46°F to 54°F). The evenings and early mornings can still feel chilly, making it important to bring layers if you’re planning to spend time outside after dark. 

Humidity levels in September hover between 60% and 75%. The reduced humidity and warming temperatures create an enjoyable environment, as the island dries out from the heavier winter rains. Although rainfall is less frequent than in the previous months, brief showers still occur, typically scattered throughout the month.

Average temperatures on Kangaroo Island in September

Sunshine Hours and Daylight in September

September on Kangaroo Island sees a noticeable jump in both sunshine and daylight hours as winter begins to fade and spring makes itself known. On average, the island experiences around 12 hours of sunshine per day, with the sun rising around 6.30am and setting at 6.30pm. The combination of longer daylight hours and warm spring weather makes it easy to get outdoors and explore at your own pace.

UV levels on Kangaroo Island in September

The average daily maximum UV index across Kangaroo Island in September increases to between 4 and 6, which is considered a moderate risk of exposure to ultraviolet rays. The sun’s rays start becoming even more intense during this time, making it even more important to cover up and layer with a hat and sunscreen before venturing outdoors. 

Average Rainfall on Kangaroo Island in September

September on Kangaroo Island marks the transition from the wetter winter months to the drier, sunnier days of spring. On average, the island receives between 40 and 60 millimetres of rain throughout September, spread across around 8 to 10 rainy days. These showers tend to be lighter, coming in short bursts, followed by plenty of sunshine.

The cooler and mild spring weather means that even when it does rain, it’s usually followed by a refreshing, crisp atmosphere perfect for hiking, coastal walks, or wildlife spotting. It’s always a good idea to bring a lightweight waterproof jacket or poncho just in case.

Best Things to Do on Kangaroo Island in September

September on Kangaroo Island is the ideal time to get outdoors as the island welcomes spring. The milder temperatures and longer daylight hours are perfect for exploring the island’s many attractions. From blossoming wildflowers to wildlife becoming more active, there’s so much to see and do. Whether you’re looking to dive deep on an adventure through caves, enjoy a spot of snorkelling to glimpse the sealife beneath or hike your way around the various landscapes, September offers plenty of opportunities to make the most of your visit. Here are some of the best things to do on Kangaroo Island during this stunning springtime season.

Explore Kelly Hill Caves

If you’re after an unforgettable experience that will stay with you long after the trip finishes, Kelly Hill Caves is the place to go. You will discover an amazing underground limestone cave system filled with impressive stalactites and stalagmites. As spring brings milder weather, it’s the perfect time to venture into the cool, underground caves. You can take a guided tour and learn all about the geological formations while discovering the cave’s history.

If you’re feeling a little more daring, you can join an Adventure Tour that goes beyond the main viewing areas to crawl and climb through narrow passages, experiencing the cave system in a hands-on way. Something you can definitely head home and brag about.

Snorkel or Dive at Kingscote Jetty

September is a great time for diving under the crystal clear waters and getting to know the stunning marine life underneath. Kingscote Jetty is a popular spot for snorkelling and diving, where you can see schools of fish, rays, and colourful sponges that cling to the jetty pylons. 

If you’re a more experienced diver, you can take one of the deep dives around the jetty and see even further beneath, including shipwrecks that are home to plenty of sea life. The milder spring weather in September makes the conditions ideal for both snorkelling and diving, with water temperatures slowly rising as the month progresses. 

Visit Cape Willoughby Lighthouse

Cape Willoughby Lighthouse is one of the oldest in South Australia and offers guided tours where you can learn about its significance in maritime history and enjoy panoramic views of the coastline. September’s mild spring weather is perfect for climbing the lighthouse’s steps to take in the ocean views. Even better, on a clear day you might even spot whales migrating along the coast.

There are also plenty of walking trails nearby, so after your tour you can take off and explore the surrounding area and even pack a picnic to enjoy along the way.

Join a Spring Foraging Tour

September is the beginning of the foraging season on Kangaroo Island. Led by local guides, these tours teach you how to identify and harvest edible plants, herbs, and sea vegetables found along the coastline and in the island’s forests. It’s a fantastic way to learn about the island’s native flora and its traditional uses in food and medicine.

Many tours also include cooking demonstrations where you can learn how to prepare simple, seasonal dishes using the ingredients gathered during the walk. The foraging tours in September provide an immersive, hands-on experience, blending outdoor exploration with local culinary traditions.

Go Birdwatching at Lashmar Conservation Park

Lashmar Conservation Park is a haven for bird enthusiasts, and September is a prime time for birdwatching as many species return to the island or become more active at the beginning of spring. You can spot a variety of native birds, including black swans, parrots, and more.

eptember on Kangaroo Island is a time of new life, as the island transitions from winter to spring. The warming temperatures, blooming wildflowers, and active wildlife make it an ideal season to explore the island’s landscapes and attractions. Whether you’re heading into the depths of Kelly Hill Caves, snorkelling in the clear waters at Kingscote Jetty, or soaking in the panoramic views from Cape Willoughby Lighthouse, there’s so many unique experiences to enjoy. Pack your bag and beat the crowds in this early spring month to experience everything this stunning island has to offer.

Whether you’ve started planning your Kangaroo Island holiday or not, check out First Light Travel’s Kangaroo Island blog for any further information you might need. Or, you can contact FLT’s Kangaroo Island travel team for advice and guidance on how to design your own trip.