Cosy Corner Water Temperature & Swim Forecast
Family Bay-of-Fires beach.
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
Cosy Corner 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 15.9°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
- + Optional 3mm boots
Recommendation tuned for Cosy Corner's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Cosy Corner swimming conditions summary
- Water temperature
- 15.9°C
- Water feels
- Refreshing
- Swimmable today
- Only with thermal protection
- Swim conditions score
- 57/100 · Fair
- Wetsuit needed
- 4/3mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 16.0 °C
- Warmest months to swim
- January, February, December
At 15.9°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 Cosy Corner right now?
The sea at Cosy Corner is currently 15.9°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 Cosy Corner next week?
Based on long-term September averages and the latest marine model, expect the sea around Cosy Corner to sit close to 17.4°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 Cosy Corner?
January – February – December are typically the warmest months to swim at Cosy Corner, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Cosy Corner?
With water currently at 15.9°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 Cosy Corner today?
The sea is currently 15.9°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in Tasmania, Australia (Tasman Sea).
- • 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 Cosy Corner
The sea in Cosy Corner peaks in January, when the water averages around 22°C.
The main swimming season runs from November – March, when surface temperatures stay comfortable for extended sessions.
On average, 5 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like October and April are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically July at around 15°C, when cold-water swimmers dominate the coast.
Cosy Corner sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
Cosy Corner sea temperature history
Long-term climatology for Cosy Corner shows an annual mean sea temperature of 19°C, ranging from 15°C in winter to 22°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 Cosy Corner, 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.
Cosy Corner sea temperature: frequently asked questions
What is the warmest month to swim in Cosy Corner?
January is the warmest month in Cosy Corner, when the sea averages about 22°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Cosy Corner?
The coldest month in Cosy Corner is typically July, when the water averages around 15°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Cosy Corner without a wetsuit?
The main swimming season in Cosy Corner runs from November – March — about 5 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 Cosy Corner?
Outside peak summer the water in Cosy Corner drops toward 15°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 Cosy Corner?
The long-term annual mean sea temperature in Cosy Corner is about 19°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Cosy Corner?
The live reading at the top of this page shows the current sea temperature in Cosy Corner, 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 – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan ⭐ | 22°C | Warm |
| Feb | 22°C | Warm |
| Mar | 21°C | Pleasant |
| Apr | 19°C | Pleasant |
| May | 17°C | Bracing |
| Jun | 16°C | Bracing |
| Jul | 15°C | Bracing |
| Aug | 15°C | Bracing |
| Sep | 16°C | Bracing |
| Oct | 18°C | Pleasant |
| Nov | 20°C | Pleasant |
| Dec | 22°C | Warm |
Nearby beaches
The closest coastline, with live water temperatures.