Mornington Main Beach Water Temperature & Swim Forecast
Family Mornington bayside beach.
Cool water with a light chop and a light breeze — tough conditions for unprotected swimming.
Current model estimate · updated 0 min ago · modelled, not a buoy measurement. How accurate is this?
Location
Mornington Main 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.
5/4mm fullsuit + boots & gloves
At 12.9°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood.
- + 5mm boots
- + 3mm gloves
- + Hood for extended sessions
Recommendation tuned for Mornington Main Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Mornington Main Beach swimming conditions summary
- Water temperature
- 12.9°C
- Water feels
- Bracing
- Swimmable today
- Only with thermal protection
- Swim conditions score
- 41/100 · Poor
- Wetsuit needed
- 5/4mm fullsuit + boots & gloves
- Air temperature
- —
- Waves
- 1.0 m · light chop
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 13.0 °C
- Warmest months to swim
- January, February, March
At 12.9°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood. Current model estimate · updated 0 min ago. 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 Mornington Main Beach right now?
The sea at Mornington Main Beach is currently 12.9°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 Mornington Main Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Mornington Main Beach to sit close to 13.7°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 Mornington Main Beach?
January – February – March are typically the warmest months to swim at Mornington Main Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Mornington Main Beach?
With water currently at 12.9°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 Mornington Main Beach today?
The sea is currently 12.9°C — poor swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in Victoria, Australia (Bass Strait).
- • 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 Mornington Main Beach
The sea in Mornington Main Beach peaks in January, when the water averages around 19°C.
On average, 0 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Outside peak season the water drops toward 12°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically July at around 12°C, when cold-water swimmers dominate the coast.
Mornington Main Beach sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
Mornington Main Beach sea temperature history
Long-term climatology for Mornington Main Beach shows an annual mean sea temperature of 16°C, ranging from 12°C in winter to 19°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 Mornington Main 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.
Mornington Main Beach sea temperature: frequently asked questions
What is the warmest month to swim in Mornington Main Beach?
January is the warmest month in Mornington Main Beach, when the sea averages about 19°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Mornington Main Beach?
The coldest month in Mornington Main Beach is typically July, when the water averages around 12°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Mornington Main Beach without a wetsuit?
The sea in Mornington Main Beach rarely climbs above 20°C, so a wetsuit is recommended year-round for anything longer than a quick dip.
Do I need a wetsuit in Mornington Main Beach?
Outside peak summer the water in Mornington Main Beach drops toward 12°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 Mornington Main Beach?
The long-term annual mean sea temperature in Mornington Main Beach is about 16°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Mornington Main Beach?
The live reading at the top of this page shows the current sea temperature in Mornington Main 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
| Month | Sea | Comfort |
|---|---|---|
| Jan ⭐ | 19°C | Pleasant |
| Feb | 19°C | Pleasant |
| Mar | 18°C | Pleasant |
| Apr | 17°C | Bracing |
| May | 15°C | Bracing |
| Jun | 13°C | Cold |
| Jul | 12°C | Cold |
| Aug | 12°C | Cold |
| Sep | 13°C | Cold |
| Oct | 14°C | Bracing |
| Nov | 16°C | Bracing |
| Dec | 18°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.