Second Valley Beach Water Temperature & Swim Forecast
Sheltered Fleurieu cove.
Cool water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Second Valley Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
4/3mm fullsuit
At 15.4°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
- + Optional 3mm boots
Recommendation tuned for Second Valley Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Second Valley Beach swimming conditions summary
- Water temperature
- 15.4°C
- Water feels
- Refreshing
- Swimmable today
- Only with thermal protection
- Swim conditions score
- 55/100 · Fair
- Wetsuit needed
- 4/3mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 15.0 °C
- Warmest months to swim
- January, February, March
At 15.4°C you need a 4/3mm fullsuit, and many surfers add neoprene boots. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Second Valley Beach right now?
The sea at Second Valley Beach is currently 15.4°C — cold swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Second Valley Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Second Valley Beach to sit close to 15.7°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Second Valley Beach?
January – February – March are typically the warmest months to swim at Second Valley Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Second Valley Beach?
With water currently at 15.4°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Second Valley Beach today?
The sea is currently 15.4°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in South Australia, Australia (Southern Ocean).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Second Valley Beach
The sea in Second Valley Beach peaks in February, when the water averages around 21°C.
The main swimming season runs from January – March, when surface temperatures stay comfortable for extended sessions.
On average, 3 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like December and April are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 14°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically July at around 14°C, when cold-water swimmers dominate the coast.
Second Valley Beach sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
Second Valley Beach sea temperature history
Long-term climatology for Second Valley Beach shows an annual mean sea temperature of 17°C, ranging from 14°C in winter to 21°C at the summer peak.
The seasonal swing is roughly 7°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Second Valley Beach, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Second Valley Beach sea temperature: frequently asked questions
What is the warmest month to swim in Second Valley Beach?
February is the warmest month in Second Valley Beach, when the sea averages about 21°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Second Valley Beach?
The coldest month in Second Valley Beach is typically July, when the water averages around 14°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Second Valley Beach without a wetsuit?
The main swimming season in Second Valley Beach runs from January – March — about 3 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Second Valley Beach?
Outside peak summer the water in Second Valley Beach drops toward 14°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Second Valley Beach?
The long-term annual mean sea temperature in Second Valley Beach is about 17°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Second Valley Beach?
The live reading at the top of this page shows the current sea temperature in Second Valley Beach, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb – Mar
| Month | Sea | Comfort |
|---|---|---|
| Jan | 20°C | Pleasant |
| Feb ⭐ | 21°C | Pleasant |
| Mar | 20°C | Pleasant |
| Apr | 18°C | Pleasant |
| May | 17°C | Bracing |
| Jun | 15°C | Bracing |
| Jul | 14°C | Bracing |
| Aug | 14°C | Bracing |
| Sep | 15°C | Bracing |
| Oct | 16°C | Bracing |
| Nov | 17°C | Bracing |
| Dec | 19°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.