Water safety & what the conditions mean
DiveScout's traffic lights are a forecast-based guide to help you plan. They are not a safety clearance. Local warnings, signage, lifesaver advice and your own training always come first.
In an emergency
Dial 000 for emergency services. In a scuba diving emergency, contact the 24-hour DAN Diving Emergency Service hotline on 1800 088 200 (toll-free within Australia).
What our ratings do and don't do
We combine forecast wind, swell, tide, rain and modelled water visibility with what we know about each site and your stated experience level, then show green, amber or red for the time you're looking at.
- A rating is a forecast, produced hours ahead from models on a grid — not a measurement at the water's edge.
- It cannot see algal blooms, water quality alerts, marine stingers, boat traffic, construction or anything posted on a sign at the car park. Some local hazards — like beach closures — can be shared through hazard reports from other divers, but a report only exists if someone has submitted one, so it is never a complete picture.
- It does not replace water safety education, certification, or the judgement of lifesavers, dive operators and local divers.
- Green never means "safe for everyone". It means the forecast numbers sit inside the limits we use for your level.
Before you get in — the essentials
- •Never snorkel or dive alone — stay with a buddy and agree what you'll do if you're separated.
- •Tell someone on shore where you're going and when you'll be back.
- •Dive and snorkel within your training, fitness and experience — not to the limit of the forecast.
- •Check your gear before every entry, and check your buddy's.
- •Watch the site from land for a few minutes before entering. Plan your exit before you get in.
- •Choose patrolled locations where you can, and swim between the red and yellow flags.
- •Wear bright, high-visibility gear and tow a float or flag so boats can see you.
- •If conditions look worse than the forecast, trust your eyes and call it off. There's always another day.
What each condition means
Tap a condition to see what it is, why it matters in the water, and what to watch for.
WindShow
How hard the air is moving, and which direction it blows from.
Why it matters: Wind builds surface chop, pushes you away from your entry point and makes boat pick-ups harder. Wind blowing off the land (offshore) usually leaves the water near shore calmer; wind blowing onto the shore stirs up sand and cuts visibility.
Watch for: Rising wind through the day is common — a calm morning can turn into a messy afternoon exit.
SwellShow
Long-period waves that travelled in from distant weather, separate from local chop.
Why it matters: Swell decides how hard the entry and exit will be, how much surge you'll feel underwater, and how much sand is lifted into the water column. Even small swell can knock you over on a rock shelf or ladder.
Watch for: Swell wraps around headlands. A sheltered bay site can be flat while a back beach 10 minutes away is unsafe.
TideShow
The rise and fall of sea level, and the current that moves with it.
Why it matters: Many sites are only safe near slack water — the short window when tidal current eases. Tide also changes entry depth over rocks and how far you have to walk or swim.
Watch for: Currents can run hard in channels and around piers even when the surface looks calm.
Water visibilityShow
How far you can see horizontally underwater.
Why it matters: Low visibility makes it easy to separate from your buddy, lose your reference to the surface and miss hazards like lines or boats.
Watch for: Rain run-off, onshore wind and recent storms all knock visibility down for a day or two afterwards.
Water temperatureShow
Sea surface temperature at the site.
Why it matters: Cold water saps energy and dexterity fast, and cold-water shock on entry can make you gasp. It drives what exposure suit you need.
Watch for: Southern Australian water is cold year-round — thermoclines can be several degrees colder at depth.
RainShow
Recent and forecast rainfall.
Why it matters: Run-off carries sediment and bacteria into the water, drops visibility and makes rock and ramp entries slippery.
Watch for: Health authorities generally advise avoiding swimming near stormwater outlets for a day or so after heavy rain.
UVShow
Strength of ultraviolet radiation.
Why it matters: Time on the surface, on a boat or waiting to enter adds up quickly. Sunburn and heat stress before a dive lead to dehydration and fatigue.
Watch for: UV is still high on overcast days and reflects strongly off the water.
Rip currents — how to spot one, how to escape
A rip is a strong, narrow current flowing away from the beach. Rips are the single biggest hazard for shore entries, and they catch strong swimmers too.
Spotting one: look for deeper, darker water; a gap in the breaking waves; rippled or churned-up water running seaward; and sand, seaweed or foam being carried out.
If you're caught: know your options.
- Stay calm — don't fight the current.
- Raise an arm to seek help.
- Float with the current until it releases you.
- Swim parallel to the shore, or towards the breaking waves, and use them to help you back in.
Keep learning
Building real capability beats reading a forecast. Take a course, dive with people more experienced than you, and swim at patrolled beaches while you build confidence.
Beachsafe (Surf Life Saving Australia) · Divers Alert Network · Our data & how we rate sites