Summer days are very hot & humid, and it doesn't cool down at night time either. On average the temperature drops to minimum of 30 degrees during the night from December to March so wear light cotton pyjamas for a comfortable nights sleep.
Winter time does get cold, on average 20 degrees . . . and yes we do have rain so bring your umbrella!
Camping/Beach/Outdoor Gear: Australia is famous for its long, hot and dry summer! Make sure you wear plenty of sunscreen if you are visiting from November to March, or trust me you will suffer and burn and it will ruin your holiday! The hot weather also attracts mosquitos, bugs and spiders! Make sure you wear 'Aeroguard' insect repellent - that will keep the pests away!!
Toiletries and Medical Supplies:
During the allergy season, the Adelaide Plains has a quite high pollen count level. The projected pollen count will be given on the nightly news report during the allergy season (spring/ summer)
Camping/Beach/Outdoor Gear: Mozzie repellant if you're going anywhere near the rivers or the mangroves. During summer at dusk, if you aren't protected, they'll carry you away.
30+ suncream is a must for anyone due to the harsh and powerful sun, especially during summer. The local news forecasts will give nightly reports on expected UV ratings for the next day.
Luggage and bags:
Bring a backpack. They don't let people with ball and chain in anymore.
Clothing/Shoes/Weather Gear: Basically dress for summer as it can get very hot, but winters are mild and sometimes quite wet.
Toiletries and Medical Supplies: You can pretty much get anything you need here, usually made by the same companies as the stuff you have at home. SUN BLOCK IS VERY IMPORTANT AT ALL TIMES!! (Well, not night, obviously). You may want to bring some insect repellent too.
Photo Equipment: Yes, that would be a good idea.
Camping/Beach/Outdoor Gear: Wear a hat to keep that sun off.
Miscellaneous: Oh, and did I mention sun cream?
Luggage and bags:
Don't pack anything in vegetable or banana boxes!
Clothing/Shoes/Weather Gear: Good sunglasses have 100 % UV and glare protection. (From AUD 35 in big stores.) The rays also come from above and from the sides. I've never experienced such a bright sunlight anywhere else I've travelled so far.
Toiletries and Medical Supplies: Foot bath powder. Kidney and Bladder strengthening herbal tea when you have your first dehydration. After sunburn cream.
Miscellaneous: You are not allowed to bring food into Australia. Shoes and bike tyres have to be cleaned.